Crown Stereo Amplifier 460CSL User Manual

Power Base-1 & 460CSL Amplifier Service Manual

POWER AMPLIFIER

SERVICE MANUAL

™

POWER BASE-1 & 460CSL

MailingAddress:

P.O. Box 1000

ShippingAddress:

57620 C.R. 105

Elkhart, IN U.S.A. 46515-1000

Elkhart, IN U.S.A. 46517

CSL^™is a trademark and Power Base-1,^®ODEP^®and Crown^®are registered trademarks of Crown International, Inc.

K-SVCPB1

1-95

Power Base-1 & 460CSL Amplifier Service Manual

Table of Contents

Introduction ............................................................. 4

Scope ...................................................................... 4

Warranty .................................................................. 4

Parts ........................................................................ 5

Specifications .......................................................... 6

Voltage Conversion ................................................. 7

Circuit Theory .......................................................... 8

Test Procedures .................................................... 13

Mechanical Parts Listing ....................................... 17

Module Information ............................................... 20

Q42576-1 Output Module (Original) ..................... 21

Q42661-1 Output Module (#2) .............................. 22

Q42718-9 Output Module (#3) .............................. 23

Q42885-6 Output Module (TO-3P) ........................ 24

Q42967-2 Output Module (THC) ........................... 25

Q43200-7 Output Module (THC #2) ...................... 26

Q42552A0 Main Module (Original)........................ 27

Q42664-5 Main Module (Service Only) ................. 29

Q42682-7 Main Module (#2) ................................. 31

Q42776-7 Main Module (3rd Gain) ....................... 34

Q42953-2 Main Module (3rd Gain PB-1) .............. 37

Q43060-5 Main Module (THC) .............................. 40

Power Base-1 & 460CSL Amplifier Service Manual

Introduction

This manual contains service information on Crown

Each of the compact audio power amplifiers are

designed for professional or commercial use. Provid-

ing high power amplification from 20Hz to 20KHz with

minimum distortion, they feature balanced inputs with

bridged and parallel monophonic capability. Specific

features vary depending on model family.

poweramplifiers. Itisdesigned tobeused inconjunc-

tion with the applicable Owner's Manual. However,

some important information is duplicated in this Ser-

vice Manual in case the Owner's Manual is not readily

available.

NOTE: THE INFORMATION IN THIS MANUAL IS INTENDED

FOR USE BY AN EXPERIENCED TECHNICIAN ONLY!

WARRANTY

Each Owner's Manual contains basic policies as re-

lated to the customer. In addition it should be stated

that this service documentation is meant to be used

only by properly trained service personnel. Because

most Crown products carry a 3 Year Full Warranty

(including round trip shipping withintheUnited States),

all warranty service should be referred to the Crown

Factory or Authorized Warranty Service Center. See

theapplicableOwner’sManualforwarrantydetails.To

find the location of the nearest Authorized Service

Center or obtain instructions for receiving Crown Fac-

tory Service please contact the Crown Technical Sup-

port Group (within North America) or your Crown/

Amcron Importer (outside North America).

SCOPE

This Service Manual includes several sections. These

sections include Parts Ordering, Specifications, Volt-

age Conversion, Circuit Theory, Factory Test Proce-

dures, MechanicalPartsLists, and ModulePartsLists.

Schematics are attached. Note that component parts

with circuit board comprise a complete module. Mod-

ule part numbers are always associated with a spe-

cific circuit board, although an unpopulated circuit

board may be built up with different parts to create

different modules. Note that Crown does not sell blank

(unpopulated) circuit boards.

Crown

Technical Support Group

Factory Service

Parts Department

Mailing Address:

PO Box 1000

Elkhart, IN USA 46515-1000

Shipping Address:

57620 C.R. 105

Elkhart, IN USA 46517

Phone: (219) 294-8200

Toll Free: (800) 342-6939

FAX: (219) 294-8301

Power Base-1 & 460CSL Amplifier Service Manual

Parts

shipment on a C.O.D. or pre-payment (check or credit

card) basis.

GENERAL INFORMATION

Later sections include both mechanical and electrical

parts lists for this product. The parts listed are current

as of the date printed. Crown reserves the right to

modify and improve its products for the benefit of its

customers.

TERMS

Normal terms are pre-paid. Net-30 Days applies to

only those firms having pre-established accounts with

Crown. If pre-paying, the order must be packed and

weighed before a total bill can be established, after

which an amount due will be issued and shipment

made upon receipt of pre-payment. New parts re-

turned for credit are subject to a 10% re-stocking fee,

and authorization from the Crown Parts Department

must be obtained before returning parts for credit.

PART NUMBERING SYSTEMS

As of the printing of this manual, Crown is using two

numbering systems. The elder system always uses

eight characters. The first character is a letter. Com-

mon letters used are C, D, H, M, P, and Q. The second

through sixth characters are numbers. The numbers

build sequentially (for each prefix letter) as new parts

are added to our parts inventory system. (In some

cases there will be a space then a four character

number after the prefix letter; the space is considered

a character.) The seventh character is usually a hy-

phen, though it may be a letter to indicate a revision or

specialnote.Thelastcharacteriscalled acheck-digit,

and is useful to Crown for internal tracking.

Crown is not a general parts warehouse. Parts sold by

the Crown Parts Department are solely for servicing

Crown/Amcron products. Part prices and availabil-

ity are subject to change without notice.

Crown is in the process of converting to a new part

number system. Length may vary from eight to twelve

characters. There is still a letter prefix, then five

numbers. These five numbers identify a type of part.

The seventh character is a hyphen. Remaining char-

acters identify the details of the type of part identified

by the first part of the number.

Crown

Parts Department

STANDARD AND SPECIAL PARTS

Mailing Address:

PO Box 1000

Elkhart, IN USA 46515-1000

Many smaller electrical and electronic parts used by

Crown are stocked by and available from electronic

supply houses. However, some electronic parts that

appear to be standard are actually special. A part

ordered from Crown will assure an acceptable re-

placement. Structural items such as modules and

panels are available from Crown only.

Shipping Address:

57620 C.R. 105

Elkhart, IN USA 46517

Phone: (219) 294-8210

or: (219) 294-8211

Toll Free: (800) 342-6939

FAX: (219) 294-8301

ORDERING PARTS

When ordering parts, be sure to give the product

model, and include a description and part number

(CPN/DPN) from the parts listing. Price quotes are

available on request.

SHIPMENT

Shipment will be normally made by UPS or best other

method unless you specify otherwise. Shipments are

made to and from Elkhart, Indiana USA, only. Estab-

lished accounts with Crown will receive shipment

freight prepaid and will be billed. All others will receive

Power Base-1 & 460CSL Amplifier Service Manual

Specifications

Unless noted otherwise, all specifications are based

Input Impedance: Nominally 20K ohms balanced; 10K

on driving an 8 ohm load per channel, both channels

driven, the sensitivity switch in the 26dB position, the

AC supply is 120VAC at 60Hz. Crown specifications

are guaranteed through the warranty period (normally

3 years). Because our testing methods are more strin-

gent than our published specifications, every Crown

amplifier will exceed its published specifications.

ohms unbalanced.

Output Impedance: <10 milliohms in series with <2

microhenries.

Protection Systems: Output Device Emulation Protec-

tion (ODEP) limits drive in the event of dangerous

dynamic thermalconditionswithoutinterrupting power.

Currentlimiting forshorted load protection.DC/LFand

common mode output current Fault circuitry to mute

audio. Delayof4secondsfromturnonmutesamplifier

to prevent dangerous turn-on transients. High voltage

fuse in main transformer primary and low voltage fuse

in fan primary. Slew rate limiting to prevent RF burn

out.

POWER

Power

8 Ohm Stereo—205W/Ch

4 Ohm Stereo—230W/Ch

8 Ohm Bridge Mono—430W

4 Ohm Parallel Mono—425W

Load Impedances: Rated for 16, 8, 4, and 2 (parallel

monoonly)Ohmoperation;safewithalltypesofloads,

even totally reactive loads.

MECHANICAL

Input Connectors: Balanced 1/4 inch phone jacks.

AC Mains: 120VAC at 60 Hz with standard 3 wire

grounded 15A connector with single voltage trans-

former and fan for North American units; 100VAC,

120VAC, 220VAC, and 240VAC at 50 or 60 Hz when

equipped with universal transformer, applicable fan,

and other applicable hardware with country specific

power cord. Note that at 50 Hz fan speed is reduced.

Output Connectors: Color-coded 5-way binding posts

on 3/4 inch centers; spaced 3/4 inch apart.

Front Panel Controls: A rocker on/off power switch.

Back Panel Controls: A three-position switch which

selects Stereo, Bridge-Mono, or Parallel-Mono mode;

a two position input ground-lift switch, and level con-

trols for each channel.

PERFORMANCE

Frequency Response: ±0.1dB from 20 Hz to 20 kHz at 1

Internal Controls:Athree-positionswitchselects0.775V,

1.4V, or 26 dB voltage gain input sensitivity (all units

manufactured with D 7911-7 main module or later;

earlier models only allowed for 0.775V or 26 dB gain).

Watt.

Phase Response: ±10° from 10 Hz to 20 kHz at 1 Watt.

Signal to Noise Ratio: Better than 105 dB (A-weighted)

below max. average power from 20 Hz to 20 kHz.

Indicators: Red Enable indicator shows on/off status of

low-voltage power supply.

Total Harmonic Distortion (THD): <0.05% from 20 Hz to

1 kHz, increasing linearly to 0.1% at 20 kHz at 170W.

Construction: Black splatter-coat steel chassis with

specially designed flow-through ventilation system.

I.M. Distortion:<0.05%from10milliwattsto170Wat26

dB gain.

Mounting: Standard EIA 310 front-panel rack mount

with supports for supplemental rear corner mounting.

Slew Rate: >13V per microsecond.

Damping Factor: >1000 from 10 Hz to 400 Hz.

DC Offset: <10 millivolts.

Dimensions:19incheswide, 3.5incheshigh, 16inches

deep behind front mounting surface.

Weight: 30 lbs.

Power Base-1 & 460CSL Amplifier Service Manual

Voltage Conversion

PB/CSL Universal Fuse Board

P16

P10

100V Connections:

P10 to P15

P15

P14

P11 to P14

P7 to P12

120V Connections:

P10 to P16

P11 to P14

P7 to P13

P13

P12

220V Connections:

P10 to P15

P9 to P14

P8 to P13

P19

P20

BLU

BRN

240V Connections:

P10 to P16

P9 to P14

P11

P8 to P13

For list of applicable

transformer, fuse F100,

fanformer, and power

cord refer to voltage-

parts cross-reference.

P22

P21

F100

P18

Specific parts are required for the PB-1/460CSL in

order to be used at different international line volt-

ages. Refer also to Mechanical Parts Lists.

P17

100V AC Mains:

10A Fuse

A10285-26

A10285-7

D 7598-2

H43055-5

0.5A Low Voltage Supply Fuse

Power Transformer (Universal)

Transmotor 120V 50 Hz

S1 Power Switch

120V AC Mains:

10A Fuse

A10285-26

A10285-7

D 7598-2

D 6589-2

H43055-5

H43065-4

0.5A Low Voltage Supply Fuse

Power Transformer (Universal)

Power Transformer (United States)

Transmotor 120V 50 Hz

Transmotor 120V 60 Hz

Note: The only versions of this

product produced at the Crown

Factory with international volt-

age capabilities built in are CSL

versions built specifically for

sale outside the United States.

220V to 240V AC Mains:

5A Fuse

A10285-21

A10285-7

D 7598-2

H43055-5

0.5A Low Voltage Supply Fuse

Power Transformer

Transmotor 120V 50 Hz

Power Base-1 & 460CSL Amplifier Service Manual

Theory

clude a single core transformer (one primary with two

OVERVIEW

independent ungrounded secondaries), a full time full

speed fan which also serves as the low voltage

transformer, slew rate limiting, and audio muting for

delay or protective action. This amplifier can operate

in either a Bridged or Parallel Mono mode as well as

dual (stereo). A sensitivity switch allows selection of

input voltage required for rated output. Level controls

are rear mounted. The only indicator provided tells the

operator that the low voltage supply is energized. In

general, the packaging of this model is designed for

maximum watt/price/weight/size value. It is the most

basic grounded bridge amplifier now available from

Crown.

It should be noted from the outset that the PB-1 and

460CSL amplifiers are electrically and mechanically

identical products. The only differences, from a ser-

vice perspective, are cosmetic. For the purposes of

servicing the products, it should also be known that

the CSL version has been on the market since 1992.

Since the PB amplifiers have been in production since

the mid-1980’s there are a number of electrical and

mechanicalpartsassociated withtheolderPBmodels

only. It is also important to realize that over time Crown

has introduced numerous improvements to PB/CSL

amplifiers. Though often changes are minor, and are

madeforavarietyofreasons, afewchangeshavehad

a significant impact on the operation of the circuitry.

This manual is up to date as of the time of writing. For

additional information regarding these amplifiers, re-

fer to the applicable Technical Notes provided by

Crown for this product.

For additional details refer to the specification section,

or to the applicable Owner’s Manual.

FRONT END OPERATION

The front end is comprised of three stages: Balanced

Gain Stage (BGS), Variable Gain Stage (VGS), and

the Error Amp. Figure 1 shows a simplified diagram of

a typical front end with voltage amplification stages.

This section of the manual explains the general opera-

tion of a typical Crown power amplifier. Topics cov-

ered include Front End, Grounded Bridge, and ODEP.

Due to variations in design from vintage to vintage

(and similarities with other products Crown) the theory

of operation remains simplified.

Balanced Gain Stage (BGS)

Input to the amplifier is balanced. The shield may be

isolated from chassis ground by an RC network to

interrupt ground loops (early models did not have the

Ground Lift feature) via the Ground Lift Switch. The

non-inverting (hot) side of the balanced input is fed to

the non-inverting input of the first op-amp stage. The

inverting (negative) side of the balanced input is fed

to the inverting input of the first op-amp stage. A

potentiometer is provided for common mode rejection

adjustment. Electrically, the BGS is at unity gain.

(From an audio perspective, however, this stage

actually provides +6dB gain if a fully balanced signal

is placed on its input.) The BGS is a non-inverting

stage. It’s output is delivered to the Variable Gain

Stage.

FEATURES

Power Base/CSL amplifiers utilize numerous Crown

innovations including grounded bridge and ODEP

technologies. Cooling techniques make use of the

whatisessentiallyairconditionertechnology. Airflows

bottom to top, and front to side. Air flows a short

distance across a wide heatsink. This type of air flow

provides significantly better cooling than the “wind

tunnel” technology used by many other manufactur-

ers. Output transistors are of the metal can type rather

than plastic case. This allows for a significantly higher

thermal margin for the given voltage and current

ratings. All devices used are tested and graded to

ensure maximum reliability. Another electronic tech-

nique used is negative feedback. Almost all power

amplifiers utilize negative feedback to control gain

and provide stability, but Crown uses multiple nested

feedback loops for maximum stability and greatly

improved damping.MostCrownamplifiershavedamp-

ing inexcessof1000inthebassfrequencyrange.This

feedback, along with our compensation and ultra-low

distortion output topology, make Crown amplifiers

superior.

Variable Gain Stage (VGS)

Note: Older models only had two front end stages.

The functions of this stage were combined, primarily,

with those of the third.

FromtheoutputoftheBGS, thesignalgoestotheVGS

where gain is determined by the position of the Sen-

sitivity Switch, and level is determined by the level

control. VGS is an inverting stage with the input being

fed to its op-amp stage. Because gain after this stage

is fixed at 26dB (factor of 20), greater amplifier sensi-

Features specific to the Power Base/CSL Series’ in-

Power Base-1 & 460CSL Amplifier Service Manual

Theory

tivity is achieved by controlling the ratio of feedback to

Voltage Translators

input resistance. The Sensitivity Switch sets the input

impedance to this stage and varies the gain such that

the overall amplifier gain is 26 dB, or is adjusted

appropriately for 0.775V or 1.4V input to attain rated

output. Note that earlier models (before main modules

built with D 7911-7 board) did not support the 1.4V

sensitivity.

A voltage divider network splits the Error Signal (ES)

into positive and negative drive signals for the bal-

anced voltagetranslatorstage.Theseoffsetreference

voltages drive the input to the Voltage Translator

transistors. A nested NFb loop from the output of the

amplifier mixes with the inverted signal riding on the

offset references. Thisnegativefeedbackfixesgainat

the offset reference points (and the output of the Error

Amp) at a factor of -25.2 with respect to the amplifier

output. The Voltage Translators are arranged in a

common base configuration for non-inverting voltage

gain with equal gain. They shift the audio from the

±15V reference to VCC reference. Their outputs drive

their respective LVA.

Error Amp

The inverted output from the VGS is fed to the non-

inverting input of the Error Amp op-amp stage through

an AC coupling capacitor and input resistor. Amplifier

output is fed back via the negative feedback (NFb)

loop resistor. The ratio of feedback resistor to input

resistor fixes gain from the Error Amp input to the

output of the amplifier at 26 dB. Diodes prevent

overdriving the Error Amp. Because the Error Amp

amplifies the difference between input and output

signals, any difference in the two waveforms will

produce a near open loop gain condition which in turn

results in high peak output voltage. The output of the

Error Amp, called the Error Signal (ES) drives the

Voltage Translators.

Also tied into the Voltage Translator inputs are ODEP

limiting transistors and control/protection transistors.

The ODEP transistors steal drive as dictated by the

ODEP circuitry (discussed later). The control/protec-

tion transistors act as switches to totally shunt audio to

ground during the turn-on delay, or during a DC/LF or

Fault protective action.

Last Voltage Amplifiers (LVAs)

The Voltage Translator stage channels the signal to

the Last Voltage Amplifiers (LVA's) in a balanced

configuration. The+LVAand -LVA, withtheirpush-pull

effect through the Bias Servo, drive the fully comple-

mentary output stage. The LVAs are configured as

common emitter amplifiers. This configuration pro-

videssufficientvoltagegainand invertstheaudio. The

polarity inversion is necessary to avoid an overall

polarity inversion from input jack to output jack, and it

VOLTAGE AMPLIFICATION

The Voltage Translator stage separates the output of

the Error Amp into balanced positive and negative

drive voltages for the Last Voltage Amplifiers (LVAs),

translating the signal from ground referenced ±15V to

±Vcc reference. LVAsprovidethemainvoltageampli-

fication and drive the High Side output stages. Gain

from Voltage Translator input to amplifier output is a

factor of 25.2.

+15V

+VCC

Voltage

BGS

VGS

Error

Amp

Translators

Q105

Q100

Q103

Q121 Q101

NPN Outputs (+HS)

PNP Outputs (-HS)

Audio

Inputs

Q102

Q122

Q110

Mute

NFb Loop

-VCC

-15V ODEP

LVA's

Figure 1. Typical Amplifier Front End and Voltage Amplification Stages.

Power Base-1 & 460CSL Amplifier Service Manual

Theory

allows the NFb loop to control Error Amp gain by

The output of the +LVA drives the base of predriver

device. Together, the predriver and driver form the

first two parts of the three-deep Darlington and are

biased class AB. They provide output drive through

the bias resistor, bypassing the output devices, at

levels below about 100mW. An RLC network between

the predriver and driver provide phase shift compen-

sation and limit driver base current to safe levels.

Output devices are biased class B, just below cutoff.

Atabout100mWoutputtheyswitchontoconducthigh

current to the load. Together with predriver and driver,

the output device provide an overall class AB+B

output.

feeding back to its non-inverting input (with its polarity

opposite to the output of the VGS). With the added

voltage swing provided by the LVAs, the signal then

gains current amplification through the Darlington

emitter-follower output stage.

GROUNDED BRIDGE TOPOLOGY

Figure 2 is a simplified example of the grounded

bridge output topology. It consists of four quadrants

of three deep Darlington (composite) emitter-follower

stages per channel: one NPN and one PNP on the

High Side of the bridge (driving the load), and one

NPN and one PNP on the Low Side of the bridge

(controlling the ground reference for the rails). The

output stages are biased to operate class AB+B for

ultra low distortion in the signal zero-crossing region

and high efficiency.

The negative half of the HS is almost identical to the

positive half, except that the devices are PNP. One

difference is that the PNP bias resistor is slighter

greater in value so that PNP output devices run closer

to the cutoff level under static (no signal) conditions.

This is because PNP devices require greater drive

current.

High Side (HS)

The High Side (HS) of the bridge operates much like

a conventional bipolar push-pull output configuration.

As the input drive voltage becomes more positive, the

HS NPN conducts and delivers positive voltage to the

load. Eventually the NPN devices reach full conduc-

tion and +Vcc is across the load. At this time the HS

PNP is biased off. When the drive signal is negative

going, the HS PNP conducts to deliver -Vcc to the load

and the HS NPN stage is off.

HS bias is regulated by Q18, the Bias Servo. Q18 is a

Vbe multiplier which maintains approximately 3.3V

Vceunderstatic conditions. Thepositiveand negative

halves of the HS output are in parallel with this 3.3V.

With a full base-emitter on voltage drop across

predrivers and drivers, the balance of voltage results

in approximately .35V drop across the bias resistors in

+Vcc (Positive Rail)

Input

signal

Load

(speaker)

Inverting Op-amp

-Vcc (Negative Rail)

HIGH SIDE

LOW SIDE

Figure 2. Crown Patented Grounded Bridge Topology

Power Base-1 & 460CSL Amplifier Service Manual

Theory

thepositivehalf, and about.5Vacrossthebiasresistor

in the negative half. Q18 conduction (and thus bias) is

adjustable.

anegativepolarity.Using thesameexampleasabove,

a 70V supply would allow a negative output peak of -

70V. In summary, a power supply which produces a

total of 70VDC rail to rail (or ±35VDC statically) is

capableofproducing 140Vpeak-to-peakattheampli-

fier output when the grounded bridge topology is

used. The voltage used in this example are relatively

close to the voltages of the PB-1/460CSL.

A diode string prevents excessive charge build up

within the high conduction output devices when off.

Flyback diodes shunt back-EMF pulses from reactive

loads to the power supply to protect output devices

from dangerous reverse voltage levels. An output

terminating circuit blocks RF on output lines from

entering the amplifier through its output connectors.

The total effect is to deliver a peak to peak voltage to

the speaker load which is twice the voltage produced

by the power supply. Benefits include full utilization of

the power supply (it conducts current during both

halves of the output signal; conventional designs

require two power supplies per channel, one positive

and one negative), and never exposing any output

device to more than half of the peak to peak output

voltage (which does occur in conventional designs).

Low Side (LS)

The Low Side (LS) operates quite differently. The

power supply bridge rectifier is not ground refer-

enced, nor is the secondary of the main transformer.

In other words, the high voltage power supply floats

with respect to ground, but ±Vcc remain constant with

respect to each other. This allows the power supply to

deliver +Vcc and -Vcc from the same bridge rectifier

and filter as a total difference in potential, regardless

of their voltages with respect to ground. The LS uses

inverted feedback from the HS output to control the

ground reference for the rails (±Vcc). Both LS quad-

rants are arranged in a three-deep Darlington and are

biased AB+B in the same manner as the HS.

Low side bias is established by a diode string which

also shunts built up charges on the output devices.

Bias is adjustable via potentiometer. Flyback diodes

perform the same function as the HS flybacks. The

output of the LS is tied directly to chassis ground via

ground strap.

OUTPUT DEVICE EMULATION PROTECTION

(ODEP)

When the amplifier output swings positive, the audio is

fed to an op-amp stage where it is inverted. This

inverted signal is delivered directly to the bases of the

positive (NPN) and negative (PNP) LS predrivers. The

negative drive forces the LS PNP devices on (NPN

off). As the PNP devices conduct, Vce of the PNP

Darlington drops. With LS device emitters tied to

ground, -Vcc is pulled toward ground reference.

Since the power supply is not ground referenced (and

the total voltage from +Vcc to -Vcc is constant) +Vcc

is forced higher above ground potential. This contin-

ues until, at the positive amplifier output peak, -Vcc =

0V and +Vcc equals the total power supply potential

with a positive polarity. If, for example, the power

supplyproduced atotalof70Vfromrailtorail(±35VDC

measured from ground with no signal), the amplifier

output would reach a positive peak of +70V.

To further protect the output stages, a specially devel-

oped ODEP circuit is used. It produces a complex

analog output signal. This signal is proportional to the

always changing safe-operating-area margin of the

output transistors. The ODEP signal controls the Volt-

age Translator stage by removing drive that may

exceed the safe-operating-area of the output stage.

ODEP senses output current by measuring the volt-

age dropped across LS emitter resistors. LS NPN

current (negative amplifier output) and +Vcc are

sensed, then multiplied to obtain a signal proportional

to output power. Positive and negative ODEP voltages

are adjustable via two potentiometers. Across ±ODEP

are a PTC and a thermal sense (current source). The

PTC is essentially a cutoff switch that causes hard

ODEP limiting if heatsink temperature exceeds a safe

maximum, regardless of signal level. The thermal

sense causes the differential between +ODEP and –

ODEPtodecreaseasheatsinktemperatureincreases.

An increase in positive output signal output into a load

will result in –ODEP voltage dropping; an increase in

negativeoutputvoltageand currentwillcause+ODEP

voltage to drop. A complex RC network between the

Conversely, during a negative swing of the HS output

where HS PNP devices conduct, the op-amp would

output a positive voltage forcing LS NPN devices to

conduct. This would result in +Vcc swinging toward

ground potential and -Vcc further from ground poten-

tial. At the negative amplifier output peak, +Vcc = 0V

and -Vcc equals the total power supply potential with

Power Base-1 & 460CSL Amplifier Service Manual

Theory

±ODEP circuitry is used to simulate the thermal barri-

ers between the interior of the output device die

(immeasurable by normal means) and the time delay

from heat generation at the die until heat dissipates to

the thermal sensor. The combined effects of thermal

history and instantaneous dynamic power level result

in an accurate simulation of the actual thermal condi-

tion of the output transistors.

POSITIVE

HIGH SIDE

OUTPUT

+LVA

-1

+VOLTAGE

TRANSLATOR

NPN STAGE

ERROR

AMP

BGS

VGS

OUTPUT

DEVICE

EMULATION

PROTECTION

HIGH SIDE

BIAS

SERVO

BALANCED

INPUTS

-1

NEGATIVE

HIGH SIDE

OUTPUT

-LVA

-1

-VOLTAGE

TRANSLATOR

PNP STAGE

MAIN NEGATIVE FEEDBACK (NFb) LOOP

POSITIVE

LOW SIDE

OUTPUT

NPN STAGE

LOW SIDE

BIAS

DIODE

-1

STRING

NEGATIVE

LOW SIDE

OUTPUT

INVERTING

BRIDGE

BALANCE

PNP STAGE

Figure 3. Typical Crown Amplifier Basic Block Diagram (One Channel Shown)

Power Base-1 & 460CSL Amplifier Service Manual

Checkout Procedures

The following is a list of ODEP Bias Voltages VS.

Temperature.

GENERAL INFORMATION

The following test procedures are to be used to verify

operation of this amplifier. DO NOT connect a load or

inject a signal unless directed to do so by the proce-

dure. These tests, though meant for verification and

alignment of the amplifier, may also be very helpful in

troubleshooting. For best results, tests should be

performed in order.

°F

°C

V_–ODEP

–10.31

–10.26

–10.20

–10.14

–10.09

–10.03

–10.00

–9.97

–9.91

–9.86

–9.80

–9.74

V_+ODEP

11.41

11.36

11.30

11.24

11.19

11.13

11.10

11.07

11.01

10.96

10.90

10.84

10.79

10.73

10.67

10.61

18.9

20.0

21.1

22.2

23.3

24.4

25.0

25.6

26.7

27.8

28.9

30.0

31.1

32.2

33.3

34.4

AlltestsassumethatACpowerisfromaregulated 120

VAC source. Test equipment includes an oscillo-

scope, a DMM, a signal generator, loads, and I.M.D.

and T.H.D. noise test equipment.

STANDARD INITIAL CONDITIONS

Level controls fully clockwise.

Stereo/Mono switch in Stereo.

Sensitivity switch in 26 dB fixed gain position.

It is assumed, in each step, that conditions of the

amplifier are per these initial conditions unless other-

wise specified.

–9.69

–9.63

–9.57

–9.51

–ODEP Procedure: Measure pin 6 of U100 and, if

necessary, adjust R121 to obtain V_–ODEPas specified

above. Measure pin 6 of U200 and, if necessary,

adjust R221 to obtain V_–ODEPas specified above.

+ODEP Procedure: Measure pin 6 of U103 and, if

necessary, adjust R132 to obtain V_+ODEPas specified

above. Measure pin 6 of U203 and, if necessary,

adjust R232 to obtain V_+ODEPas specified above.

TEST 1: DC OFFSET

Spec: 0 VDC, ±10 mV.

Initial Conditions:Controlsperstandard,inputsshorted.

Procedure: Measure DC voltage at the output connec-

tors (rear panel). There is no adjustment for output

offset. If spec is not met, there is an electrical malfunc-

tion. Slightly out of spec measurement is usually due

to U104/U204 out of tolorance.

TEST 2: OUTPUT BIAS ADJUSTMENT

Spec: 300 to 310 mVDC.

Initial Conditions: Controls per standard, heatsink tem-

perature less than 40°C.

Procedure:MeasureDCvoltagesontheoutputmodule

across R31, adjust R26 if necessary. Measure DC

voltages on the output module across R32, adjust R23

if necessary. Repeat for second channel.

TEST 3: ODEP VOLTAGE ADJUSTMENT

Spec: Cold Bias Per Charts Below ±0.1V DC.

Initial Conditions: Controls per standard, heatsink at

room temperature 20 to 30°C (68 to 86°F). Note: This

adjustment should normally be performed within 2

minutes of turn on from ambient (cold) conditions. If

possible measure heatsink temperature, if not mea-

sure ambient room temperature. Use this information

when referencing the chart below.

Power Base-1 & 460CSL Amplifier Service Manual

Checkout Procedures

Procedure: No Load. Inject a 1 kHz sine wave. With

TEST 4: AC POWER DRAW

level controls fully clockwise you should see full gain.

As controls are rotated counterclockwise, observe

similar gain reduction in each channel. When com-

plete, return level controls to fully clockwise position.

Spec: 90 Watts maximum quiescent.

Initial Conditions: Controls per standard.

Procedure: With no input signal and no load, measure

AC line wattage draw. If current draw is excessive,

check for high AC line voltage or high bias voltage.

TEST 9: CURRENT LIMIT

Spec: Current Limit at 13 ±2 Amps

TEST 5: COMMON MODE REJECTION

Initial Conditions: Controls per standard.

Procedure: Load each channel to 1 Ohm. Inject a 1 kHz

differentiated (or 10% duty cycle) square wave and

increase output level until current limit occurs. Current

limit should occur at 11 ±1 Amps. Observe clean (no

oscillations) current clipping.

Spec at 100 Hz: –70 dB.

Spec at 20 kHz: –50 dB.

Initial Conditions: Controls per standard.

Procedure: No load. Inject a 0 dBu 100 Hz sine wave

intoeachchannel,onechannelatatime,withinverting

and non-inverting inputs shorted together. At the

output measure less than –44 dBu. Inject a 0 dBu 20

kHz sine wave into each channel, one channel at a

time, with inverting and non-inverting inputs shorted

together. At the output measure less than –24 dBu.

Adjust R921 or R1021, if necessary, to obtain the

required measurements. (In older units the adjust-

ments are done using N100/N200.)

TEST 10: SLEW RATE & 10 KHZ SQUARE WAVE

Spec: >13V/µS.

Initial Conditions: Controls per standard.

Procedure: Load each channel to 8 ohms. Inject a 10

kHz square wave to obtain 40 volts peak-to-peak at

each output. Observe the slope of the square wave. It

should typically measure 17 to 25 V/µS. Also, the

square wave must not include overshoot, ringing, or

any type of oscillation.

TEST 6: VOLTAGE GAIN

Spec: ±3% when the Sensitivity Switch is set for 26dB

gain, ±6% when the Sensitivity Switch is set for 0.775V

or 1.4V sensitivity.

TEST 11: CROSSTALK

Spec: <33 mVAC at 20 kHz.

Initial Conditions: Controls per standard.

Procedure: No load connected. Inject a 0.775 VAC 1

kHz sine wave with the Sensitivity Switch in the 26 dB

position. Measure 15.5 VAC ±0.07 VAC at the ampli-

fieroutput. Injecta0.775VAC1kHzsinewavewiththe

SensitivitySwitchinthe0.775Vposition. Measure39.9

VAC ±1.2 VAC at the amplifier output. Inject a 1.4 VAC

1 kHz sine wave with the Sensitivity Switch in the 1.4V

position. Measure 39.9 VAC ±1.2 VAC at the amplifier

output. Return the Sensitivity Switch to the 26 dB

position.

Initial Conditions: Controls per standard. Short input of

channel not driven.

Procedure:8ohmload oneachchannel.Injecta20kHz

sinewaveintotheChannel1inputand increaseoutput

level to 37.4 VAC. Measure less than 33 mVAC at the

output of Channel 2. Inject a 20 kHz sine wave into the

Channel2inputand increaseoutputlevelto37.4VAC.

Measure less than 33 mVAC at the output of Channel

TEST 12: OUTPUT POWER

TEST 7: PHASE RESPONSE

Spec: ±10° at 1 Watt.

Spec at 8 Ohm Stereo: 205W at 0.1% THD.

Spec at 4 Ohm Stereo: 230W at 0.1% THD.

Initial Conditions: Controlsperstandard, 8ohmload on

each channel.

Procedure: Inject a 1 kHz sine wave and adjust for 1

Watt output (2.8 VAC). Check input and output signals

against each other, input and output signals must be

within 10° of each other.

Initial Conditions: Controls per standard.

Procedure:Load eachchannelto8ohms.Injecta1kHz

sinewaveand measureatleast40.5VACattheoutput

of each channel. Load each channel to 4 ohms. Inject

a 1 kHz sine wave and measure at least 30.3 VAC. All

power measurements must be at less than 0.1% THD.

TEST 8: LEVEL CONTROLS

Spec: Level controlled by level controls.

Initial Conditions: Controls per standard.

TEST 13: REACTIVE LOADS

Spec: No oscillations. Safe with all types of loads.

Initial Conditions: Controls per standard.

Power Base-1 & 460CSL Amplifier Service Manual

Checkout Procedures

Procedure Capacitive: Load each channel to 8 ohms in

parallel with 2 µF. Inject a 20 kHz sine wave with 30

VAC output for 10 seconds.

Procedure Inductive: Load each channel to 8 ohms in

parallel with 159 µHenries. Inject a 1 kHz sine wave

with 15 VAC output for 10 seconds.

TEST 15: LF PROTECTION

Spec: Amplifier mutes for low frequency.

Initial Conditions: Controls per standard.

Procedure: No load. Inject a 0.5 Hz 6 volt peak-to-peak

square wave into each channel and verify that each

channel cycles into mute.

Procedure Torture: Load each channel with the primary

(red and black leads) of a DC-300A transformer (D

5781-6). Inject a 10 Hz sine wave at sufficient output

level to cause 3 to 5 flyback pulses, for 10 seconds.

Procedure Short: Inject a 60 Hz sine wave at 5 VAC.

After establishing signal, short the output for 10 sec-

onds.

TEST 16: SIGNAL TO NOISE RATIO

Spec: 100 dB (105 dB A-weighted) below rated 8 ohm

power.

Initial Conditions: Controls per standard. Short inputs.

Procedure: Load each channel to 8 ohms. Measure

lessthan400µVattheoutputofeachchannel(or–100

dB from reference of +34.25 dBu).

TEST 14: ODEP LIMITING

Spec: No oscillation on ODEP Limiting wave form;

either channel controls limiting in Parallel Mono Mode.

Initial Conditions: Controls per standard; rag or other

obstruction blocking fan so that it does not turn.

Procedure: Load the amplifier to 2 ohms on each

channel. Inject a 60 Hz sine wave and adjust for 15

Vrmsattheoutput. Afterafewminutesobserveawave

form similar to Figure 4. Remove the input signal from

both channels and allow the amplifier to cool for a few

minutes. Switch the amplifier to Parallel Mono and

remove the load from Channel 1. Inject the signal into

Channel 1 and observe that ODEP limiting occurs at

the output of both channels. Remove the load from

Channel 2, and install the load on Channel 1. Again,

observe that both channels limit. Return all amplifier

controls to standard initial conditions. Remove the fan

obstruction.

TEST 17: TURN ON TRANSIENTS

Spec: No dangerous transients.

Initial Conditions: Controls per standard.

Procedure: From an off condition, turn on the amplifier

and monitor the output noise at the time of turn on.

Note: Turn on noise may increase significantly if the

amplifier is cycled off and on.

TEST 18: TURN OFF TRANSIENTS

Spec: No dangerous transients.

Initial Conditions: Controls per standard.

Procedure: From an on condition, turn off the amplifier

and monitor the output noise at the time of turn off.

Note: Turn off noise may increase significantly if the

amplifier is cycled off and on.

TEST 19: INTERMODULATION DISTORTION

Spec at 0 dB Output: 0.01%.

Spec at –35 dB Output: 0.05%.

Initial Conditions: Controls per standard.

Procedure: Load each channel to 8 ohms. Inject a

SMPTEstandard IMsignal(60Hzand 7kHzsinewave

mixed at 4:1 ratio) at 200 Watts (32.4 VAC). With an IM

analyzer measure less than 0.01% IMD. Repeat test at

–35 dB (reference 200 Watts or 32.4 VAC) and mea-

sure less than 0.05% IMD.

TEST 20: CLIPPING

Spec: No protective action during test.

Initial Conditions: Controls per standard.

Procedure:Load eachchannelto8ohms.Injecta1kHz

sine wave at each input and drive output 6 dB into clip

for 10 seconds. The amplifier should not activate any

protective circuits (ODEP, Fault, or LF Protection).

POST TESTING

After completion of testing, if all tests are satisfactory,

Figure 4. ODEP Limiting Wave Form

the amplifier controls should be returned to the posi-

tions required by customer. If conditions are unknown

or unspecified, factory settings are as follows:

Power Base-1 & 460CSL Amplifier Service Manual

Checkout Procedures

Power Base-1 & 460CSL Amplifier Service Manual

Mechanical (Non-Module) Parts

SUPPLIMENTAL ITEMS

CPN

ITEM

QTY

D 4137-2

C 3342-0

A10087-71012

Nylon Thumbscrew Washer

Feet, Black Self-Stick

10-32 .75 Machine (Rack Screw)

120VAC/60HZ NORTH AMERICA PRODUCT ONLY

CPN

ITEM

QTY

A10285-26

A10285-7

D 6589-2

A10101-19

H42873-2

P10391-4

P10426-6

Fuse, 10A 3AB (120V Units)

Fuse, .5A AGC 1.25x.25 (LVPS)

PB-1 Power Transformer

Washer, Fiber (XFMR Assby)

Fanformer Assembly

Fuse Board (U.S. Only)

Fuse Board (International Only)

FANFORMER MECHANICAL ASSEMBLY

CPN

ITEM

QTY

C 7062-0

C 9939-7

D 8439-8

Screw, 6-32-5/16 Flat Mach

Fan Blade, 4 inch CCW

Fan Bracket

FILTER CAPACITOR MOUNTING ASSEMBLY (ONE PER CHANNEL)

CPN

ITEM

QTY

A10095-4

A10098-5

C 7015-8

C 8752-5

C 9870-4

D 6764-1

D 8438-0

Washer, #10 Ext. Lock

Belleville Spring Washer

C126/C226 7800µF 90V

D117/D217 35A 400V Bridge Rectifier

Screw, 10-32-.38 Pan

Washer, Shoulder

Bracket, Capacitor Mounting

FUSE BOARD ASSEMBLY

CPN

ITEM

QTY

C 5060-6

P10391-4

Fuse Clip, PC Mount #926

Fuse Board

LED ASSEMBLY

CPN

ITEM

QTY

C 4342-9

P10068B4

Enable LED, Amber

LED Board

Power Base-1 & 460CSL Amplifier Service Manual

Mechanical (Non-Module) Parts

OUTPUT ASSEMBLY (ONE PER CHANNEL)

CPN

ITEM

QTY

A10100-4

A10315-1

C 4751-1

C 5826-0

C 6492-0

C 7326-9

C 8573-5

C 8574-3

C 8813-5

C 9491-9

D 7665-9

D 7666-7

D 7796-2

D 7797-0

D 8264-0

F12019-0

F12469-7

Washer, #6 Flat Zinc

Screw, 6-32-.56 Hex Washer Head

NPN Output Device

S100/S200 Thermal Sense LM334Z

PNP Output Device

Solder Lug, #6 Tin

PNP Driver Device TO-3P

NPN Driver Device TO-3P

Q318/Q418 Bias Servo MPSA18/MPS8097

Screw, 6-32-.312 Taptite Pan Ph

Clip, TO-3P Mounting

Bracket, TO-3P Heatsink

Silpad Insulator

Output Thru-Hole Pad Insulator

PTC Thermal Sensor

Diode Heatsink Slug

Heatsink, Aluminum

Output Module (See Module List)

BACK PANEL ASSEMBLY

CPN

ITEM

QTY

A10214-7

C 2823-0

D 7074-4

M21208J9

A10019-8

Strain Relief (Power Cord)

Dual Binding Post Assembly

Power Cord (3-14 15A USA)

Back Panel

Nut, #8 32-2 Captive

CHASSIS FRONT ASSEMBLY

CPN

ITEM

QTY

A10031-1

A10090-70806

A10090-70808

A10101-5

A10110-70605

A10173-1

D 6944-9

Nut, 8-32 Captive

Screw, 8-32-.375 Mach Ph Oval (Grille)

Screw, 8-32-.5 Mach Ph Oval

Washer, Nylon (Grille)

Screw, 6-32-.312 Taptite Ph (Cover)

Clip, Grille Filter

Air Filter

D 8465J2

D 8501-5

End Cap

Cover, Top

D 8548-6

Cover, Bottom

F10962-3

F11978J7

F12435J7

Front Panel Overlay PB-1

Front Panel Overlay 460CSL

Grille

Power Base-1 & 460CSL Amplifier Service Manual

Mechanical (Non-Module) Parts

MAIN CHASSIS ASSEMBLY

CPN

ITEM

QTY

A10086-11008

A10086-70806

A10089-11032

A10094-3

A10094-6

A10094-8

A10099-7

A10100-16

A10102-8

A10109-10822

A10110-70812

A10192-1

C 1811-6

C 3163-0

C 6487-0

C 6912-7

C 6913-5

C 6914-3

C 9491-9

C 9953-8

D 7340-9

Screw, 10-32-.5 Mach Rd Ph

Screw, 8-32-.37 Mach Rd Ph

Screw, 10-32-2 Mach Pan Ph

Washer, #6 Black Star

Washer, #8 Black Star

Washer, #10 Tooth Lock

Washer, #10 Nylon Shoulder

Washer

Nut, 10-32 Hex Zinc

Screw, 8-18-1.375 Pan Ph

Screw, 8-32-.75 Taptite Pan Ph

Snap Bushing .5

Tie Wrap

Solder Lug #6 505

Power Switch 22A Rocker 2 Pole

Tension Retainer Board Support

Spacer Nut, 1 inch

Spacer Nut, .75 inch

Screw, 6-32-.312 Taptite Pan

Screw, 6-20-.312 Taptite Pan Black

Label, F1 Fuse Replacement

Ground Strap (DBP to Chassis)

Label, Sensitivity Switch

Label, F200 Fuse Replacement

Insulator, Fuse Board

Back Panel Plate

Transformer Plate

Chassis

Main Module (See Module List)

D 7600-6

D 7784-8

D 8003-2

D 8069-4

F10787J3

F10963-1

M21059J6

Power Base-1 & 460CSL Amplifier Service Manual

Module Information

MODULE HISTORY

MAIN MODULES:

Since its introduction in 1986, the PB-1 has gone

through a number of updates and revisions. Over the

course of its history some of these changes have

resulted in upgrading to newer modules. What follows

is a historical breakdown of PB-1 modules. It should

also be noted that the 460CSL was introduced in 1992

and therefor modules obsoleted before that time were

never used in the CSL version.

Q42552A0

This was the original main board. It offered 2 front end

gain stages and was also used in the PB-1, MT-600/

LX, MT-1200/LX. It did not include ground lift, but did

offer a choice of .775V or 26 dB voltage gain sensitivi-

ties. No longer available.

Q42664-5

ServicereplacementforQ42552A0forPB-1.Nolonger

available.

Q42682-7

OUTPUT MODULES:

Main #2. Upgraded board from Q42552A0 for PB-1.

No longer available.

Q42776-7

Q42576-1

Original output module. No longer available.

Q42661-1

Universally usable PC board, finished module used in

MT-600/1200, MA-600/1200, and PB-1. Added third

gain stage and ground lift switch. For use in the PB-1

install two level pots (C 7409-3) and remove R187 and

R287. Can replace all older modules. Use this module

to replace this or any previous module. This module

can also be used to replace the Q42953-2 module put

into production later. Note that if this module is being

used to replace an older module, you may have to

slide the ground lift switch to the left (ground lift

position) and clip off the plastic switch protrusion in

order for the module to properly fit in the unit.

Q42953-2

Through hole output module. No longer available.

Q42718-9

Output module: 4 resistor small predriver. PB-1 Only.

Last output module for PB-1 for use with TO-220

package driver transistors.

Q42885-6

TO-3P Driver Output module. Not for use in THC units,

not retrofittable into TO-220 driver transistor units.

Q42967-2

THCOutputmodulewithTO-3Pdrivers.Notretrofittable

to any older units. Does not require special main

module for THC ODEP recompensation. Also im-

proved bias stability.

PB-1 main module to replace Q42776-7. This or the

Q42776-7 module may be used with TO-3P driver

transistoroutputmodules,and withorwithoutThrough

Hole Chassis (THC) in this amplifier.

Q43200-7

THC #2 Output Module. Replaces Q42967-2 only.

Electrically identical, but larger screw head plates

prevent shorting which could occur with the first THC

output module.

Q43060-5

THC main module built on D 7993-5 circuit board. On

this module the boost circuit has been deleted, the

third position (1.4V) is added to the Sensitivity Switch,

and additional fault circuitry has been added to the

module. Althoughitispossibletomodifyanyolderunit

to accept this module, it is recommended that the

Q42776-7beused toreplacemainmodulesinallolder

units, and this module be used only as a replacement

for itself.

Power Base-1 & 460CSL Amplifier Service Manual

Q42576-1 Output Module Parts List (P10137-1 Board)

Q42576-1 Output Module (4 Resistor Original) for PB-1:

RESISTORS

R00

R01

R02

R03

R08

R09

R10

R11

R12

R13

R14

R15

R20

R21

R22

R23

R24

R25

R26

R27

R28

R30*

A10266-7501 75

A10266-4711 470

CAPACITORS

C01

C02

C03

C04

C05

C06

C07

C08

C 3978-1

C 6804-6

C 3996-3

C 6807-9

C 6806-1

C 6807-9

C 6810-3

C 6809-5

C 6806-1

.047µF

.1µF

.0047µF

.001µF

.01µF

.001µF

180pF

220pF

.01uF

C 7778-1

C 6486-2

C 7779-9

5.6

.2 5W

A10266-4711 470

C 1001-4

2.7 1W

A10266-7501 75

C09

C43

C 1001-4

C 6486-2

C 7778-1

C 7779-9

C 6844-2

2.7 1W

.2 5W

5.6

DIODES

D01

D02

D03

D04

D05

D06

D07

D08

D09

D10

D11

D12

C 2851-1

1N4004

250 Pot LS Bias

A10266-1331 13K

A10266-2221 2.2K

C 6844-2

250 Pot HS Bias

A10266-3911 390

A10266-1331 13K

A10265-10201* 102*

MISC.

Board

Jumpers

Clips

P10137-1

C 5868-2

D 6414-3

0 Ohm Jumper (8)

Q17/19 Hold Down

10 Pos. Connector

J500 J600 C 7057-0

INDUCTORS

L00

L01

L02

C 6592-6

C 3510-2

Output Coil

470µH

Note: R30 is 102 Ohms in most units, though in some

cases a different value may be used to match the

installed S100/S200 LM334 (C5826-0) device grade.

This is the standard value and is used with the most

common LM334 grade, green. If the LM334 is marked

with a blue dot, R30 should be a 107 Ohm resistor

(A10265-10701); if it is marked with a yellow dot then

R30 should be a 100 Ohm resistor (A10265-10001).

TRANSISTORS

Q17

Q19

C 3810-6

C 3578-9

NPN MPSA43

PNP MPSA93

Power Base-1 & 460CSL Amplifier Service Manual

Q42661-1 Output Module Parts List (P10137-1 Board)

Q42661-1 Output Module (4 Resistor #2) for PB-1:

RESISTORS

R00

R01

R02

R07

R09

R10

R11

R12

R13

R14

R15

R16

R19

R21

R22

R23

R24

R25

R26

R27

R28

R30*

A10266-7501 75

A10266-4711 470

CAPACITORS

C01

C02

C03

C04

C05

C06

C07

C08

C 3978-1

C 6804-6

C 3996-3

C 6807-9

C 6806-1

C 6807-9

C 6810-3

C 6809-5

.047µF

.1µF

.0047µF

.001µF

.01µF

.001µF

180pF

220pF

C 7778-1

D 6600-7

C 7779-9

5.6

.19 5W

A10266-4711 470

C 1001-4

2.7 1W

A10266-7501 75

C 1001-4

D 6600-7

C 7778-1

C 7779-9

C 6844-2

2.7 1W

C09

.19 5W

5.6

DIODES

D01

D02

D03

D04

D05

D06

D07

D08

D09

D10

D11

D12

C 2851-1

1N4004

250 Pot LS Bias

A10266-1331 13K

A10266-2221 2.2K

C 6844-2

250 Pot HS Bias

A10266-3911 390

A10266-1331 13K

A10265-10201* 102*

MISC.

Board

P10137-1

Jumpers

Clips

J500 J600 C 7057-0

C 5868-2

D 6414-3

0 Ohm Jumper (4)

Q17/19 Hold Down

10 Pin Header

INDUCTORS

L00

L01

L02

C 6592-6

C 3510-2

Output Coil

470µH

Note: R30 is 102 Ohms in most units, though in some

cases a different value may be used to match the

installed S100/S200 LM334 (C5826-0) device grade.

This is the standard value and is used with the most

common LM334 grade, green. If the LM334 is marked

with a blue dot, R30 should be a 107 Ohm resistor

(A10265-10701); if it is marked with a yellow dot then

R30 should be a 100 Ohm resistor (A10265-10001).

TRANSISTORS

Q17

Q19

C 3810-6

C 3578-9

NPN MPSA43

PNP MPSA93

Power Base-1 & 460CSL Amplifier Service Manual

Q42718-9 Output Module Parts List (P10233-8 Board)

Q42718-9 Output Module (4 Resistor #3) for PB-1:

RESISTORS

R00

R01

R07

R10

R11

R12

R13

R14

R15

R16

R19

R23

R24

R25

R26

R27

R28

R30*

R31

R32

R33

R34

R35

R36

R37

R38

R39

R40

A10266-7501 75

A10266-4711 470

CAPACITORS

C01

C02

C03

C04

C05

C06

C07

C08

C 3978-1

C 3218-2

C 8534-7

C 6807-9

C 6806-1

C 6807-9

C 6810-3

C 6809-5

.047µF

.22µF

.0047µF

.001µF

.01µF

.001µF

180pF

220pF

D 6600-7

.19 5W

A10266-4711 470

A10266-2R73 2.7 1W

A10266-1204 12 2W

A10266-7501 75

A10266-1204 12 2W

D 6600-7

C 6844-2

.19 5W

250 Pot LS Bias

C09

A10266-1331 13K

A10266-2221 2.2K

DIODES

D01

D02

D03

D04

D05

D06

D07

D08

D09

D10

D11

D12

C 2851-1

1N4004

C 6844-2

250 Pot HS Bias

A10266-3911 390

A10266-1331 13K

A10265-10201* 102*

C 7778-1

C 7779-9

5.6 .5W Flame Proof

22 .5W Flame Proof

A10266-1204 12 2W

INDUCTORS

L00

L01

L02

C 6592-6

C 3510-2

1.3µH Output Coil

470µH

MISC.

Board

P10233-8

Jumpers

Clips

J500 J600 C 7057-0

C 5868-2

D 6414-3

0 Ohm .25W

Q17/Q19Hold Down

10 Pin Header

TRANSISTORS

Q17

Q19

C 3810-6

C 3578-9

NPN MPSA43/42

PNP MPSA93

*Note: R30 is 102 Ohms in most units, though in some

cases a different value may be used to match the

installed S100/S200 LM334 (C5826-0) device grade.

This is the standard value and is used with the most

common LM334 grade, green. If the LM334 is marked

with a blue dot, R30 should be a 107 Ohm resistor

(A10265-10701); if it is marked with a yellow dot then

R30 should be a 100 Ohm resistor (A10265-10001).

Power Base-1 & 460CSL Amplifier Service Manual

Q42885-6 Output Module Parts List (P10305-4 Board)

Q42885-6 Output Module (4 Resistor TO-3P Drivers) for

PB-1/460CSL:

RESISTORS

R00

R01

R04

R07

R10

R11

R12

R13

R16

R19

R23

R24

R25

R26

R27

R28

R29

R30*

R31

R32

R33

R34

R35

R36

R37

R38

R39

R40

A10266-7501 75

A10266-4711 470

CAPACITORS

C01

C02

C03

C04

C05

C06

C07

C08

D 6600-7

.19 5W

C 8511-5

C 7964-7

C 8534-7

C 6807-9

C 6806-1

C 6807-9

C 6810-3

C 6809-5

C 6806-1

.047µF

.22µF

.0047µF

.001µF

.01µF

.001µF

180pF

220pF

.01uF

A10266-4711 470

C 1001-4

C 3931-0

2.7 1W

12 2W

A10266-7501 75

D 6600-7

C 6844-2

.19 5W

250 Pot LS Bias

C09

C43

A10266-1331 13K

A10266-2221 2.2K

C 6844-2

250 Pot HS Bias

A10266-3911 390

A10266-1331 13K

DIODES

D01

D02

D03

D04

D05

D06

D07

D08

D09

D10

D11

D12

C 2851-1

1N4004

C 6402-9

51 OHM

A10265-10201* 102*

C 7778-1

C 7779-9

C 3931-0

5.6 flame proof

22 flame proof

12 2W

INDUCTORS

MISC.

Board

Jumpers

Clips

L00

L01

L02

C 6592-6

C 3510-2

Output Coil

470µH

P10305-4

C 5868-2

D 6414-3

0 Ohm Jumper (7)

Q17/19 Hold Down

10 Pos. Connector

Over emitter of Q19

J500 J600 C 7057-0

BEAD C 8341-7

TRANSISTORS

Q17

Q19

C 3810-6

C 3578-9

NPN MPSA43

PNP MPSA93

Note: R30 is 102 Ohms in most units, though in some

cases a different value may be used to match the

installed S100/S200 LM334 (C5826-0) device grade.

This is the standard value and is used with the most

common LM334 grade, green. If the LM334 is marked

with a blue dot, R30 should be a 107 Ohm resistor

(A10265-10701); if it is marked with a yellow dot then

R30 should be a 100 Ohm resistor (A10265-10001).

Power Base-1 & 460CSL Amplifier Service Manual

Q42967-2 Output Module Parts List (P10341-9 Board)

Q42967-2 Output Module for Through Hole Chassis (THC)

PB-1/460CSL units:

RESISTORS

R00

R01

R04

R07

R10

R11

R12

R13

R14

R16

R19

R23

R24

R25

R26

R27

R28

R29

R30*

R31

R32

R33

R34

R35

R36

R37

R38

R39

R40

A10266-7501 75

A10266-4711 470

CAPACITORS

D 6600-7

.19 5W

C01

C02

C03

C04

C05

C06

C07

C08

C09

C43

C 8511-5

.047µF

.22µF

.0047µF

.01µF

.001µF

180pF

220pF

.01µF

C 7964-7

C 8534-7

C 6806-1

C 6807-9

C 6810-3

C 6809-5

C 6806-1

A10266-4711 470

A10266-2R73 2.7 1W

A10266-1204 12 2W

A10266-7501 75

A10266-1204 12 2W

D 6600-7

C 6844-2

.19 5W

250 Pot LS Bias

A10266-1331 13K

A10266-2221 2.2K

C 6844-2

250 Pot HS Bias

DIODES

D01

D02

D03

D04

D05

D06

D07

D08

D09

D10

D11

D12

A10266-3911 390

A10266-1331 13K

A10266-5101 51

A10265-10201* 102*

C 2851-1

1N4004

C 7778-1

C 7779-9

5.6 .5W Flame Proof

22 .5W Flame Proof

A10266-1204 12 2W

INDUCTORS

L00

L01

L02

C 6592-6

C 3510-2

Output Coil

470µH

MISC.

Board

Jumpers

Clips

P10341-9

C 5868-2

D 6414-3

0 Ohm (Qty 7)

Q17/Q19Hold Down

10 Pin Header

TRANSISTORS

Q17

Q19

J500 J600 C 7057-0

C 3810-6

C 3578-9

NPN MPSA43

PNP MPSA93

*Note: R30 is 102 Ohms in most units, though in some

cases a different value may be used to match the

installed S100/S200 LM334 (C5826-0) device grade.

This is the standard value and is used with the most

common LM334 grade, green. If the LM334 is marked

with a blue dot, R30 should be a 107 Ohm resistor

(A10265-10701); if it is marked with a yellow dot then

R30 should be a 100 Ohm resistor (A10265-10001).

Power Base-1 & 460CSL Amplifier Service Manual

Q43200-7 Output Module Parts List (P10397-1 Board)

Q43200-7 Output Module (THC #2) for PB-1/460CSL Units:

RESISTORS

R00

R01

R04

R07

R10

R11

R12

R13

R14

R16

R19

R23

R24

R25

R26

R27

R28

R29

R30*

R31

R32

R33

R34

R35

R36

R37

R38

R39

R40

A10266-7501 75

A10266-4711 470

CAPACITORS

C01

C02

C03

C04

C05

C06

C07

C08

C 8511-5

C 7964-7

C 8534-7

C 6806-1

C 6807-9

C 6810-3

C 6809-5

C 6806-1

.047µF

.22µF

.0047µF

.01µF

.001µF

180pF

220pF

.01µF

D 6600-7

.19 5W

A10266-4711 470

A10266-2R73 2.7 1W

A10266-1204 12 2W

A10266-7501 75

A10266-1204 12 2W

D 6600-7

C 6844-2

.19 5W

250 Pot LS

C09

C43

A10266-1331 13K

A10266-2221 2.2K

DIODES

D01

D02

D03

D04

D05

D06

D07

D08

D09

D10

D11

D12

C 6844-2

250 Pot HS

C 2851-1

1N4004

A10266-3911 390

A10266-1331 13K

A10266-5101 51

A10265-10201* 102*

C 7778-1

C 7779-9

5.6 .5W Flame Proof

22 .5W Flame Proof

A10266-1204 12 2W

INDUCTORS

L00

L01

L02

C 6592-6

C 3510-2

Output Coil

470µH

MISC.

Board

P10397-1

Jumpers

Clips

J500 J600 C 7057-0

C 5868-2

D 6414-3

0 Ohm (Qty 7)

Q17/Q19Hold Down

10 Pin Header

TRANSISTORS

Q17

Q19

C 3810-6

C 3578-9

NPN MPSA43

PNP MPSA93

*Note: R30 is 102 Ohms in most units, though in some

cases a different value may be used to match the

installed S100/S200 LM334 (C5826-0) device grade.

This is the standard value and is used with the most

common LM334 grade, green. If the LM334 is marked

with a blue dot, R30 should be a 107 Ohm resistor

(A10265-10701); if it is marked with a yellow dot then

R30 should be a 100 Ohm resistor (A10265-10001).

Power Base-1 & 460CSL Amplifier Service Manual

Q42552A0 Main Module Parts List (D 6304B2 Board)

Q42552A0 Main Module (Original) for PB-1:

D112 D212 C 3181-2

D113 D213 C 3181-2

D114 D214 C 3181-2

D115 D215 C 3181-2

D120 D220 C 3181-2

D121 D221 C 3181-2

D122 D222 C 3181-2

D123 D223 C 3181-2

1N4148

CAPACITORS

C 4303-1

C 3913-8

C 4303-1

C 6802-0

1000uF

470uF

1000uF

.47uF

C100 C200 C 5053-1

C101 C201 C 2821-4

C103 C203 C 6805-3

C104 C204 C 6805-3

C105 C205 C 6950-7

C106 C206 C 6950-7

C108 C208 C 6812-9

C112 C212 C 6803-8

C113 C213 C 6802-0

C114 C214 C 3729-8

C115 C215 C 3729-8

C116 C216 C 6802-0

C117 C217 C 6803-8

C118 C218 C 6812-9

C122 C222 C 6811-1

C124 C224 C 6809-5

C125 C225 C 3729-8

C127 C227 C 3729-8

C133 C233 C 6814-5

C134 C234 C 6805-3

C135 C235 C 6805-3

C136 C236 C 6808-7

C137 C237 C 6808-7

C138 C238 C 6814-5

C139 C239 C 6814-5

C140 C240 C 6812-9

C141 C241 C 6812-9

C142 C242 C 5162-0

18uF

10pF

NETWORK RESISTORS

N100 N200 D 4669-4

N101 N201 D 6081-0

N102 N202 D 6082-8

.022uF

82pF

47pF

.12uF

.47uF

100uF 16V

.47uF

Balanced Input Trim

Resistor Network-B

Resistor Network-C

TRANSISTORS

Q100 Q200 D 2961-7

Q101 Q201 C 3578-9

Q102 Q202 C 3810-6

Q103 Q203 C 3786-8

Q104 Q204 C 3625-8

Q105 Q205 C 3578-9

Q106 Q206 C 3625-8

Q107 Q207 C 3786-8

Q108 Q208 D 2961-7

Q109 Q209 D 2961-7

Q110 Q210 C 3810-6

Q111 Q211 D 2961-7

Q112 Q212 C 3625-8

Q113 Q213 C 3625-8

Q115 Q215 D 2962-5

Q116 Q216 C 3786-8

Q117 Q217 D 2961-7

Q118 Q218 D 2961-7

Q119 Q219 C 3625-8

Q120 Q220 C 3625-8

SEL 2N3859A

MPSA93

MPSA43/A42

PN4250A

2N4125

MPSA93

.12uF

47pF

100pF

220pF

100uF 16V

12pF

.022uF

470pF

12pF

2N4125

PN4250A

SEL 2N3859A

MPSA43/A42

SEL 2N3859A

2N4125

MPS8097

PN4250A

12pF

47pF

3-12pF Trim

SEL 2N3859A

2N4125

DIODES

RESISTORS

C 2851-1

1N4004

1N4148

A10265-10031 100K 1%

A10266-3321 3.3K

R100 R200 C 6893-9

5K POT

R101 R201 A10265-49911 4.99K

R102 R202 A10266-1021 1K

R103 R203 A10265-10031 100K 1%

R104 R204 A10266-2721 2.7K

R105 R205 A10266-2721 2.7K

R106 R206 A10266-1231 12K

R107 R207 A10266-4731 47K

R108 R208 A10266-1021 1K

R109 R209 A10266-8201 82 OHM

R110 R210 A10266-4731 47K

R112 R212 A10266-5131 51K

R113 R213 A10266-4721 4.7K

D104 D204 C 2851-1

D105 D205 C 2851-1

D106 D206 C 2851-1

D107 D207 C 2851-1

D108 D208 C 3181-2

D109 D209 C 3181-2

D110 D210 C 3181-2

D111 D211 C 3181-2

Power Base-1 & 460CSL Amplifier Service Manual

Q42552A0 Main Module Parts List (D 6304B2 Board)

R114 R214 A10266-4721 4.7K

SWITCHES

S100

R115 R215 A10266-5141 510K

R116 R216 A10266-3351 3.3M

R118 R218 A10266-2711 270 OHM

R119 R219 A10266-3011 300 OHM

R120 R220 A10266-2711 270 OHM

C 6841-8

C 6781-6

4PDT

6P3T

IC’S

C 5095-2

C 5096-0

MC7815

MC7915

UPA77 PNP

UPA76 NPN

MC34084P

R121 R221 C 5062-2

100K TRIMMER

R122 R222 A10266-2741 270K

R123 R223 A10266-1831 18K

R124 R224 A10266-6821 6.8K

U100 U200 C 6500-0

U103 U203 C 6910-1

U104 U204 C 6900-2

R125 R225 C 7782-3

R126 R226 C 7782-3

100 OHM

MISC.

Board

J100 J200 C 6777-4

J500 J800 D 6619-7

J600 J700 D 6620-5

MOUNTS U1, U2:

R127 R227 A10266-6821 6.8K

R128 R228 A10266-1031 10K

R129 R229 A10266-1041 100K

R130 R230 A10266-1041 100K

R131 R231 A10266-1031 10K

D 6304A4 or D 6304B2

C 6871-5

6-Cond Snap Mate

PHONE JACK

10" RIBBON ASSY

6" RIBBON ASSY

R132 R232 C 5062-2

100K TRIMMER

R133 R233 A10266-2741 270K

R134 R234 A10266-1831 18K

(2)

C 1889-2

C 2176-3

C 5341-0

C 5594-4

6-32 NUT

6-32 X .5 SCREW

HEATSINK

R135 R235 C 7782-3

100 OHM

R136 R236 A10266-6821 6.8K

STAR WASHER

R137 R237 C 7782-3

100 OHM

MOUNTS U104, U204:

R138 R238 A10266-6821 6.8K

R139 R239 A10266-1021 1K

R140 R240 A10266-8201 82 OHM

R141 R241 A10266-1541 150K

R142 R242 A10266-1541 150K

R146 R246 A10266-1031 10K

(2)

C 3450-1

14 Pin Socket

COVERS FOR J100, J200:

(2)

C 6778-2

Cover, Phone Jack

Additional Parts

(1)

C 4508-5

C 5061-4

C 6851-7

C 7077-8

C 6899-6

16 PIN SOCKET

1N3070 DIODE

5-Pos Header

3-Cond Wire Retain

Wire Posts

R147 R247 C 7781-5

200 OHM

R148 R248 A10266-2721 2.7K

R149 R249 C 7781-5

200 OHM

R150 R250 A10266-2721 2.7K

R151 R251 A10266-1031 10K

R152 R252 A10266-1231 12K

R154 R254 A10266-1011 100 OHM

R156 R256 A10266-1321 1.3K

R157 R257 A10266-1321 1.3K

R158 R258 A10266-9121 9.1K

R159 R259 A10266-1031 10K

R161 R261 A10266-4701 47 OHM

R162 R262 A10266-4701 47 OHM

R165 R265 A10265-53611 5.36K 1%

R146 R246 A10265-53611 5.36K 1%

R167 R267 A10266-1021 1K

R168 R268 A10265-95301 953 OHM

R170 R270 A10266-1021 1K

R171 R271 A10265-95301 953 OHM

Power Base-1 & 460CSL Amplifier Service Manual

Q42664-5 Main Module Parts List (D 6910-0 Board)

Q42664-5 Main Module (Service Replacement For Origi-

nal) for PB-1:

D109 D209 C 3181-2

D110 D210 C 3181-2

D111 D211 C 5061-4

D112 D212 C 3181-2

D113 D213 C 3181-2

D114 D214 C 3181-2

D115 D215 C 3181-2

D120 D220 C 3181-2

D121 D221 C 3181-2

D122 D222 C 3181-2

D123 D223 C 5061-4

1N4148

1N3070

1N4148

1N3070

CAPACITORS

C 4303-1

C 3913-8

C 4303-1

C 6802-0

1000uF

470uF

1000uF

.47uF

C100 C200 C 5311-3

C101 C201 C 2821-4

C103 C203 C 6805-3

C104 C204 C 6805-3

C105 C205 C 6950-7

C106 C206 C 6950-7

C108 C208 C 6812-9

C112 C212 C 6803-8

C113 C213 C 6802-0

C114 C214 C 3729-8

C115 C215 C 3729-8

C116 C216 C 6802-0

C117 C217 C 6803-8

C118 C218 C 6812-9

C122 C222 C 6811-1

C123 C223 C 6811-1

C124 C224 C 6809-5

C125 C225 C 3729-8

C127 C227 C 3729-8

C128 C228 C 6803-8

C133 C233 C 6814-5

C134 C234 C 6805-3

C135 C235 C 6805-3

C136 C236 C 6808-7

C137 C237 C 6808-7

C138 C238 C 6814-5

C139 C239 C 6814-5

C140 C240 C 6812-9

C141 C241 C 6812-9

C242 C 5162-0

22uF

10pF

.022uF

82pF

47pF

.12uF

.47uF

100uF 16V

.47uF

.12uF

47pF

100pF

220pF

100uF 16V

.12uF

NETWORK RESISTORS

N100 N200 D 4669-4

N101 N201 D 6081-0

N102 N202 D 6082-8

Balanced Input Trim

Resistor Network-B

Resistor Network-C

TRANSISTORS

Q100 Q200 D 2961-7

Q101 Q201 C 3578-9

Q102 Q202 C 3810-6

Q103 Q203 C 3786-8

Q104 Q204 C 3625-8

Q105 Q205 C 3578-9

Q106 Q206 C 3625-8

Q107 Q207 C 3786-8

Q108 Q208 D 2961-7

Q109 Q209 D 2961-7

Q110 Q210 C 3810-6

Q111 Q211 D 2961-7

Q112 Q212 C 3625-8

Q113 Q213 C 3625-8

Q115 Q215 D 2962-5

Q116 Q216 C 3786-8

Q117 Q217 D 2961-7

Q118 Q218 D 2961-7

Q119 Q219 C 3625-8

Q120 Q220 C 3625-8

SEL 2N3859A

MPSA93

MPSA43/A42

PN4250A

2N4125

MPSA93

2N4125

PN4250A

SEL 2N3859A

MPSA43/A42

SEL 2N3859A

2N4125

MPS8097

PN4250A

12pF

.022uF

470pF

12pF

47pF

3-12pF Trim

SEL 2N3859A

2N4125

DIODES

RESISTORS

C 2851-1

1N4004

1N4148

A10265-10031 100K 1%

A10266-3323 3.3K 1W

R100 R200 C 6893-9

5K POT

R101 R201 A10265-49911 4.99K

R102 R202 A10266-1021 1K

R103 R203 A10265-10031 100K 1%

R104 R204 A10266-2721 2.7K

R105 R205 A10266-2721 2.7K

R106 R206 A10266-1231 12K

R107 R207 A10266-4731 47K

R108 R208 A10266-1021 1K

R109 R209 A10266-8201 82 OHM

D104 D204 C 2851-1

D105 D205 C 2851-1

D106 D206 C 2851-1

D107 D207 C 2851-1

D108 D208 C 3181-2

Power Base-1 & 460CSL Amplifier Service Manual

Q42664-5 Main Module Parts List (D 6910-0 Board)

R110 R210 A10266-4731 47K

R159 R259 A10266-1031 10K

R161 R261 A10266-4701 47 OHM

R162 R262 A10266-4701 47 OHM

R165 R265 A10265-53611 5.36K 1%

R146 R246 A10265-53611 5.36K 1%

R167 R267 A10266-1021 1K

R168 R268 A10265-95301 953 OHM

R170 R270 A10266-1021 1K

R171 R271 A10265-95301 953 OHM

R111 R211 A10266-1231 12K

R112 R212 A10266-5131 51K

R113 R213 A10266-4721 4.7K

R114 R214 A10266-4721 4.7K

R115 R215 A10266-5141 510K

R116 R216 A10266-3351 3.3M

R117 R217 A10266-4731 47K

R118 R218 A10266-2711 270 OHM

R119 R219 A10266-3011 300 OHM

R120 R220 A10266-2711 270 OHM

SWITCHES

R121 R221 C 5062-2

100K TRIMMER

C 6841-8

C 6781-6

4PDT

6P3T

R122 R222 A10266-2741 270K

R123 R223 A10266-1831 18K

R124 R224 A10266-6821 6.8K

S100

IC’S

R125 R225 C 7782-3

R126 R226 C 7782-3

100 OHM

C 5095-2

C 5096-0

MC7815

MC7915

R127 R227 A10266-6821 6.8K

R128 R228 A10266-1031 10K

R129 R229 A10266-1041 100K

R130 R230 A10266-1041 100K

R131 R231 A10266-1031 10K

U100 U200 C 6911-9

U103 U203 C 6910-1

U104 U204 C 6900-2

UPA75 PNP

UPA76 NPN

MC34084P

R132 R232 C 5062-2

R133 R233 A10266-2741 270K

R134 R234 A10266-1831 18K

R135 R235 C 7782-3

R136 R236 A10266-6821 6.8K

100K TRIMMER

MISC.

BOARD

D 6304B2

C 7593-4

C 4508-5

C 7527-2

C 7592-6

C 7077-8

5 PIN HEADER

16 PIN SOCKET

6 PIN HEADER

4 PIN HEADER

WIRE RETAINER

PHONE JACK

100 OHM

R137 R237 C 7782-3

100 OHM

J10

J11

R138 R238 A10266-6821 6.8K

R139 R239 A10266-1021 1K

R140 R240 A10266-8201 82 OHM

R141 R241 A10266-1541 150K

R142 R242 A10266-1541 150K

R146 R246 A10266-1031 10K

R147 R247 C 7781-5

R148 R248 A10266-2721 2.7K

R149 R249 C 7781-5

R150 R250 A10266-2721 2.7K

R151 R251 A10266-1031 10K

R152 R252 A10266-1231 12K

R154 R254 A10266-1011 100 OHM

R156 R256 A10266-1321 1.3K

R157 R257 A10266-1321 1.3K

R158 R258 A10266-9121 9.1K

J100 J200 C 6777-4

J500 J800 D 6619-7

J600 J700 D 6620-5

MOUNTS U1, U2:

10" RIBBON ASSY

6" RIBBON ASSY

(2)

C 1889-2

C 2176-3

C 5341-0

C 5594-4

6-32 NUT

6-32 X .5 SCREW

HEATSINK

200 OHM

STAR WASHER

MOUNTS U104, U204:

(2)

C 3450-1

14 Pin Socket

COVERS FOR J100, J200:

(2)

Additional Parts

(1)

C 6778-2

Cover, Phone Jack

3-Cond Wire Retain

C 7077-8

Power Base-1 & 460CSL Amplifier Service Manual

Q42682-7 Main Module Parts List (D 6910-0 Board)

Q42682-7 Main Module (#2) for PB-1:

DIODES

C 2851-1

1N4004

1N4148

1N3070

1N4148

1N3070

CAPACITORS

C 4303-1

C 3913-8

C 4303-1

C 6802-0

OPEN

1000uF

470uF

1000uF

.47uF

OPEN

D104 D204 C 2851-1

D105 D205 C 2851-1

D106 D206 C 2851-1

D107 D207 C 2851-1

D108 D208 C 3181-2

D109 D209 C 3181-2

D110 D210 C 3181-2

D111 D211 C 5061-4

D112 D212 C 3181-2

D113 D213 C 3181-2

D114 D214 C 3181-2

D115 D215 C 3181-2

D120 D220 C 3181-2

D121 D221 C 3181-2

D122 D222 C 3181-2

D123 D223 C 5061-4

C100 C200 C 5311-3

C101 C201 C 2820-6

C103 C203 C 6805-3

C104 C204 C 6805-3

C105 C205 C 6812-9

C106 C206 C 6812-9

C108 C208 C 6814-5

C112 C212 C 6803-8

C113 C213 C 6802-0

C114 C214 C 3729-8

C115 C215 C 3729-8

C116 C216 C 6802-0

C117 C217 C 6803-8

C118 C218 C 6814-5

C122 C222 C 6811-1

C123 C223 C 6812-9

C124 C224 C 6812-9

C125 C225 C 3729-8

C127 C227 C 3729-8

C128 C228 C 7706-2

22uF

5pF

.022uF

47pF

12pF

.12uF

.47uF

100uF 16V

.47uF

.12uF

12pF

100pF

47pF

100uF 16V

.1uF

NETWORK RESISTORS

N100 N200 D 4669-4

N101 N201 D 6081-0

N102 N202 D 6082-8

Balanced Input Trim

Resistor Network-B

Resistor Network-C

C129

C130

OPEN

C 6814-5

12pF

TRANSISTORS

C133 C233 C 6814-5

C134 C234 C 6805-3

C135 C235 C 6805-3

C136 C236 C 6808-7

C137 C237 C 6808-7

C138 C238 C 6814-5

C139 C239 C 6814-5

C140 C240 C 6812-9

C141 C241 C 6812-9

C242 C 5162-0

C144 C244 C 5362-6

C145 C245 C 6814-5

C146 C246 C 6809-5

C147 C247 C 6806-1

C148 C248 C 6810-3

C149 C249 C 6808-7

C150 C250 OPEN

Q100 Q200 D 2961-7

Q101 Q201 C 3578-9

Q102 Q202 C 3810-6

Q103 Q203 C 3786-8

Q104 Q204 C 3625-8

Q105 Q205 C 3578-9

Q106 Q206 C 3625-8

Q107 Q207 C 3786-8

Q108 Q208 D 2961-7

Q109 Q209 D 2961-7

Q110 Q210 C 3810-6

Q111 Q211 D 2961-7

Q112 Q212 C 3625-8

Q113 Q213 C 3625-8

Q115 Q215 D 2962-5

Q116 Q216 C 3786-8

Q117 Q217 D 2961-7

Q118 Q218 D 2961-7

Q119 Q219 C 3625-8

Q120 Q220 C 3625-8

Q121 Q221 C 3786-8

SEL 2N3859A

MPSA93

MPSA43/A42

PN4250A

2N4125

MPSA93

.022uF

470pF

12pF

47pF

3-12pF Trim

2.2uF

12pF

220pF

.01uF

180pF

470pF

2N4125

PN4250A

SEL 2N3859A

MPSA43/A42

SEL 2N3859A

2N4125

MPS8097

PN4250A

SEL 2N3859A

2N4125

PN4250A

C151 C251 OPEN

C152 C252 C 6809-5

C153 C253 C 5362-6

220pF

2.2uF

Power Base-1 & 460CSL Amplifier Service Manual

Q42682-7 Main Module Parts List (D 6910-0 Board)

R148 R248 A10266-2721 2.7K

RESISTORS

R149 R249 C 7781-5

200 OHM

R10

A10265-53621 53.6K 1%

OPEN

A10265-46421 46.4K 1%

A10266-3323 3.3K 1W

OPEN

R150 R250 A10266-2721 2.7K

R151 R251 A10266-1031 10K

R152 R252 A10266-1231 12K

R153 R253 C 5869-2

ZERO OHM

R155 R255 OPEN

R156 R256 A10266-1321 1.3K

R157 R257 A10266-1321 1.3K

R158 R258 A10266-9121 9.1K

R159 R259 A10266-1031 10K

R161 R261 A10266-4701 47 OHM

R162 R262 A10266-4701 47 OHM

R167 R267 A10266-1021 1K

R168 R268 A10265-95301 953 OHM

R169 R269 OPEN

R170 R270 A10266-1021 1K

R171 R271 A10265-95301 953 OHM

R172 R272 OPEN

R174 R274 A10265-38311 3.83K 1%

R175 R275 A10265-24311 2.43K 1%

R176 R276 A10266-1041 100K

R100 R200 C 7409-3

5K POT

R101 R201 A10265-49911 4.99K

R102 R202 A10266-1021 1K

R103 R203 A10265-10031 100K 1%

R104 R204 A10266-2721 2.7K

R105 R205 A10266-2721 2.7K

R106 R206 A10266-1231 12K

R107 R207 A10266-6831 68K

R108 R208 A10266-1021 1K

R109 R209 A10266-8201 82 OHM

R110 R210 A10266-6831 68K

R111 R211 A10266-1231 12K

R112 R212 A10266-5131 51K

R113 R213 A10266-4721 4.7K

R114 R214 A10266-4721 4.7K

R115 R215 A10266-5141 510K

R116 R216 A10266-3351 3.3M

R117 R217 A10266-4731 47K

R118 R218 A10266-2711 270 OHM

R119 R219 A10266-3011 300 OHM

R120 R220 A10266-2711 270 OHM

R177 R277 C 5062-2

TRIM POT

R178 R278 A10266-1231 12K

R179 R279 A10266-4731 47K

R180 R280 A10266-4711 470 OHM

R181 R281 A10266-4721 4.7K

R182 R282 A10266-2201 22 OHM

R183 R283 A10266-2051 2M

R121 R221 C 5062-2

100K TRIMMER

R122 R222 A10266-2741 270K

R123 R223 A10266-1831 18K

R124 R224 A10266-6821 6.8K

SWITCHES

C 7363-2

C 6781-6

4PDT

6P3T

R125 R225 C 7782-3

R126 R226 C 7782-3

100 OHM

S100

R127 R227 A10266-6821 6.8K

R128 R228 A10266-1031 10K

R129 R229 A10266-1041 100K

R130 R230 A10266-1041 100K

R131 R231 A10266-1031 10K

IC’S

C 5095-2

C 5096-0

MC7815

MC7915

UPA75 PNP

UPA76 NPN

MC34084P

U100 U200 C 6911-9

U103 U203 C 6910-1

U104 U204 C 6900-2

R132 R232 C 5062-2

100K TRIMMER

R133 R233 A10266-2741 270K

R134 R234 A10266-1831 18K

INTERCONNECTS

J10

J11

J100 J200 C 6777-4

J500 J800 D 6619-7

J600 J700 D 6620-5

R135 R235 C 7782-3

100 OHM

OPEN

R136 R236 A10266-6821 6.8K

C 4508-5

C 7527-2

C 7592-6

C 7526-4

16 PIN SOCKET

6 PIN HEADER

4 PIN HEADER

3 PIN HEADER

PHONE JACK

R137 R237 C 7782-3

100 OHM

R138 R238 A10266-6821 6.8K

R139 R239 A10266-1021 1K

R140 R240 A10266-8201 82 OHM

R141 R241 A10266-1541 150K

R142 R242 A10266-1541 150K

R146 R246 A10266-1031 10K

10" RIBBON ASSY

6" RIBBON ASSY

R147 R247 C 7781-5

200 OHM

Power Base-1 & 460CSL Amplifier Service Manual

Q42682-7 Main Module Parts List (D 6910-0 Board)

MISC.

BOARD

D 6910-0

MOUNTS U1, U2:

(2)

C 1889-2

6-32 NUT

6-32 X .5 SCREW

HEATSINK

C 2176-3

C 5341-0

C 5594-4

STAR WASHER

MOUNTS U104, U204:

(2)

C 3450-1

14 PIN SOCKET

Phone Jack Cover

CABLE TIE

COVERS FOR J100, J200:

(2)

STRAIN RELIEF:

(4) C 1811-6

C 6778-2

Power Base-1 & 460CSL Amplifier Service Manual

Q42776-7 Main Module Parts List (D 7251-8 Board)

Q42776-7 Main Module (3rd Gain) for PB-1:

DIODES

C 2851-1

C 3181-2

C 3549-0

1N4004

1N4148

1N916B 10V

1N4004

1N4148

1N3070

1N4148

1N3070

CAPACITORS

C 3913-8

C 6802-0

C 6806-1

C 6094-9

C 6806-1

470uF

.47uF

.01uF

33uF

.01uF

22uF

5pF

.022uF

.1uF

47pF

12pF

.12uF

.47uF

100uF 35V

.47uF

.12uF

12pF

100pF

47pF

100uF 35V

.1uF 100V

OPEN

27pF

C100 C200 C 5311-3

C101 C201 C 2820-6

C103 C203 C 6805-3

C104 C204 C 6804-6

C105 C205 C 6812-9

C106 C206 C 6812-9

C108 C208 C 6814-5

C112 C212 C 6803-8

C113 C213 C 6802-0

C114 C214 C 8026-4

C115 C215 C 8026-4

C116 C216 C 6802-0

C117 C217 C 6803-8

C118 C218 C 6814-5

C122 C222 C 6811-1

C123 C223 C 6812-9

C124 C224 C 6812-9

C125 C225 C 8026-4

C127 C227 C 8026-4

C128 C228 C 7706-2

C129 C229

C130 C230 C 6813-7

C133 C233 C 6814-5

C134 C234 C 6805-3

C135 C235 C 6805-3

C136 C236 C 6808-7

C137 C237 C 6808-7

C138 C238 C 6814-5

C139 C239 C 6814-5

C140 C240 C 6812-9

C141 C241 C 6812-9

C144 C244 C 8026-4

C145 C245 C 6814-5

C146 C246 C 6809-5

C147 C247 C 6806-1

C148 C248 C 6810-3

C 149 C249 C 6808-7

C150 C250

D104 D204 C 2851-1

D105 D205 C 2851-1

D106 D206 C 2851-1

D107 D207 C 2851-1

D108 D208 C 3181-2

D109 D209 C 3181-2

D110 D210 C 3181-2

D111 D211 C 5061-4

D112 D212 C 3181-2

D113 D213 C 3181-2

D114 D214 C 3181-2

D115 D215 C 3181-2

D120 D220 C 3181-2

D121 D221 C 3181-2

D122 D222 C 3181-2

D123 D223 C 5061-4

D124 D224 C 5061-4

NETWORK RESISTORS

N100 N200 D 4669-4

N101 N201 D 6081-0

N102 N202 D 6082-8

Balanced Input Trim

Resistor Network-B

Resistor Network-C

12pF

.022uF

470pF

12pF

47pF

100uF 35V

12pF

TRANSISTORS

C 7458-0

C 3625-8

2N4123

2N4125

Q100 Q200 D 2961-7

Q101 Q201 C 3578-9

Q102 Q202 C 3810-6

Q103 Q203 C 3786-8

Q104 Q204 C 3625-8

Q105 Q205 C 3578-9

Q106 Q206 C 3625-8

Q107 Q207 C 3786-8

Q108 Q208 D 2961-7

Q109 Q209 D 2961-7

Q110 Q210 C 3810-6

Q111 Q211 D 2961-7

Q112 Q212 C 3625-8

Q113 Q213 C 3625-8

Q115 Q215 D 2962-5

SEL 2N3859A

MPSA93

MPSA43/A42

PN4250A

2N4125

MPSA93

2N4125

220pF

.01uF

PN4250A

SEL 2N3859A

MPSA43/A42

SEL 2N3859A

2N4125

180pF

470pF

OPEN

220pF

.1uF

C151 C251

C152 C252 C 6809-5

C153 C253 C 6804-6

2N4125

MPS8097

Power Base-1 & 460CSL Amplifier Service Manual

Q42776-7 Main Module Parts List (D 7251-8 Board)

Q116 Q216 C 3786-8

Q117 Q217 D 2961-7

Q118 Q218 D 2961-7

Q119 Q219 C 3625-8

Q120 Q220 C 3625-8

Q121 Q221 C 7458-0

Q122 Q222 C 7458-0

PN4250A

SEL 2N3859A

2N4125

2N4123

R133 R233 A10266-2741 270K

R134 R234 A10266-1831 18K

R135 R235 C 7782-3

100 OHM

R136 R236 A10266-6821 6.8K

R137 R237 C 7782-3

100 OHM

R138 R238 A10266-6821 6.8K

R139 R239 A10266-1021 1K

R140 R240 A10266-8201 82 OHM

R141 R241 A10266-1541 150K

R142 R242 A10266-1541 150K

R146 R246 A10266-1031 10K

2N4123

RESISTORS

A10265-53621 53.6K

A10266-2402 24 OHM

R147 R247 C 7781-5

200 OHM

R11

R12

R13

R14

R15

A10266-2402 24 OHM

A10265-46421 46.4K

A10266-3321 3.3K

A10266-5621 5.6K

A10266-4331 43K

A10266-1021 1K

A10266-8221 8.2K

A10266-6211 620 OHM

OPEN

R148 R248 A10266-2721 2.7K

R149 R249 C 7781-5

200 OHM

R150 R250 A10266-2721 2.7K

R151 R251 A10266-1031 10K

R152 R252 A10266-1231 12K

R153 R253 C 5868-2

ZERO OHM

R156 R256 A10266-1321 1.3K

R157 R257 A10266-1321 1.3K

R158 R258 A10266-9121 9.1K

R159 R259 A10266-1031 10K

R161 R261 A10266-4701 47 OHM

R162 R262 A10266-4701 47 OHM

R167 R267 A10266-1021 1K

R168 R268 A10265-95301 953 OHM

R170 R270 A10266-1021 1K

R171 R271 A10265-95301 953 OHM

R174 R274 A10265-24921 24.9K

R175 R275 A10265-14721 14.7K

R176 R276 A10265-24921 24.9K

R179 R279 A10266-4731 47K

R180 R280 A10266-4711 470 OHM

R181 R281 A10266-4721 4.7K

R182 R282 A10266-2201 22 OHM

R183 R283 A10266-2421 2.4K

R185 R285 A10266-2421 2.4K

R186 R286 A10266-1051 1M

R187 R287 A10265-52321 52.3K

R100 R200

R101 R201 A10265-49911 4.99K

R102 R202 A10266-1021 1K

R103 R203 A10266-1041 100K

R104 R204 A10266-2721 2.7K

R105 R205 A10266-2721 2.7K

R106 R206 A10266-1231 12K

R107 R207 A10266-6831 68K

R108 R208 A10266-1021 1K

R109 R209 A10266-8201 82 OHM

R110 R210 A10266-6831 68K

R111 R211 A10266-1231 12K

R112 R212 A10266-5131 51K

R113 R213 A10266-4721 4.7K

R114 R214 A10266-4721 4.7K

R115 R215 A10266-5141 510K

R116 R216 A10266-3351 3.3M

R117 R217 A10266-4731 47K

R118 R218 A10266-2711 270 OHM

R119 R219 A10266-3011 300 OHM

R120 R220 A10266-2711 270 OHM

SWITCHES

R121 R221 C 5062-2

100K TRIMMER

R122 R222 A10266-2741 270K

R123 R223 A10266-1831 18K

R124 R224 A10266-6821 6.8K

C 7325-1

C 7363-2

C 6781-6

DPDT SIDE

DPDT GOLD

6P3T

S100

R125 R225 C 7782-3

R126 R226 C 7782-3

100 OHM

IC’S

R127 R227 A10266-6821 6.8K

R128 R228 A10266-1031 10K

R129 R229 A10266-1041 100K

R130 R230 A10266-1041 100K

R131 R231 A10266-1031 10K

C 5095-2

C 5096-0

MC7815

MC7915

UPA75 PNP

UPA76 NPN

MC34084P

U100 U200 C 6911-9

U103 U203 C 6910-1

U104 U204 C 6900-2

R132 R232 C 5062-2

100K TRIMMER

Power Base-1 & 460CSL Amplifier Service Manual

Q42776-7 Main Module Parts List (D 7251-8 Board)

INTERCONNECTS

C 7593-4

C 4508-5

C 7527-2

C 7592-6

C 7526-4

HEADER 5 PIN

16 PIN SOCKET

HEADER 6 PIN

HEADER 4 PIN

HEADER 3 PIN

PHONE JACK

J10

J11

J100 J200 C 6777-4

J500 J800 D 6619-7

J600 J700 D 6620-5

10" RIBBON ASSY

6" RIBBON ASSY

MISC.

BOARD

D 7251-8

MOUNTS U1, U2:

(2)

C 1889-2

6-32 NUT

6-32 X .5 SCREW

HEATSINK

C 2176-3

C 5341-0

C 5594-4

STAR WASHER

MOUNTS U104, U204:

(2)

C 3450-1

14 PIN SOCKET

Phone Jack Cover

CABLE TIE

COVERS FOR J100, J200:

(2)

STRAIN RELIEF:

(4) C 1811-6

C 6778-2

Note: To use this module in the PB-1, it is necessary

to remove R187/287 and install level control pots (C

7409-3).

Power Base-1 & 460CSL Amplifier Service Manual

Q42953-2 Main Module Parts List (D 7251-8 Board)

Q42953-2 PB-1 Main Module 3rd Gain Stage and Improved

offset (Original 460CSL Main Module.):

C 2851-1

C 3181-2

C 3549-0

1N4004

1N4148

1N916B 10V Zener

1N4004

1N4148

1N3070

1N4148

1N3070

CAPACITORS

C 3913-8

C 6802-0

C 6806-1

C 6094-4

C 6806-1

470µF

.47µF

.01µF

33µF 16V

.01µF

22µF

D104 D204 C 2851-1

D105 D205 C 2851-1

D106 D206 C 2851-1

D107 D207 C 2851-1

D108 D208 C 3181-2

D109 D209 C 3181-2

D110 D210 C 3181-2

D111 D211 C 5061-4

D112 D212 C 3181-2

D113 D213 C 3181-2

D114 D214 C 3181-2

D115 D215 C 3181-2

D120 D220 C 3181-2

D121 D221 C 3181-2

D122 D222 C 3181-2

D123 D223 C 5061-4

D124 D224 C 5061-4

C100 C200 C 5311-3

C101 C201 C 2820-6

C103 C203 C 6805-3

C104 C204 C 6804-6

C105 C205 C 6812-9

C106 C206 C 6812-9

C108 C208 C 6814-5

C112 C212 C 6803-8

C113 C213 C 6802-0

C114 C214 C 8876-8

C115 C215 C 8876-8

C116 C216 C 6802-0

C117 C217 C 6803-8

C118 C218 C 6814-5

C122 C222 C 6811-1

C123 C223 C 6811-1

C124 C224 C 6812-9

C127 C227 C 8576-8

C128 C228 C 7706-2

C130 C230 C 6813-7

C133 C233 C 6814-5

C134 C234 C 6805-3

C135 C235 C 6805-3

C136 C236 C 6808-7

C137 C237 C 6808-7

C138 C238 C 6814-5

C139 C239 C 6814-5

C140 C240 C 6812-9

C141 C241 C 6812-9

C144 C244 C 8576-8

C145 C245 C 6814-5

C146 C246 C 6809-5

C147 C247 C 6806-1

C148 C248 C 6810-3

C149 C249 C 6808-7

C152 C252 C 6809-5

C153 C253 C 6804-6

5pF

.022µF

.1µF

47pF

12pF

.12µF

.47µF

100µF 35V

.47µF

.12µF

12pF

100pF

47pF

TRANSISTORS

C 7458-0

C 3625-8

NPN 2N4123

PNP 2N4125

100pF

.1µF

27pF

Q100 Q200 D 2961-7

Q101 Q201 C 3578-9

Q102 Q202 C 3810-6

Q103 Q203 C 3786-8

Q104 Q204 H43113-2

Q105 Q205 C 3578-9

Q106 Q206 C 3625-8

Q107 Q207 C 3786-8

Q108 Q208 D 2961-7

Q109 Q209 D 2961-7

Q110 Q210 C 3810-6

Q111 Q211 H43113-2

Q112 Q212 C 3625-8

Q113 Q213 C 3625-8

Q115 Q215 D 2962-5

Q116 Q216 C 3786-8

Q117 Q217 D 2961-7

Q118 Q218 D 2961-7

Q119 Q219 C 3625-8

Q120 Q220 C 3625-8

Q121 Q221 C 7458-0

Q122 Q222 C 7458-0

NPN 2N3859A SEL

PNP MPSA93

NPN MPSA43/A42

PNP PN4250A

Diode Pair

12pF

.022µF

470pF

12pF

47pF

100µF 35V

12pF

220pF

.01µF

180pF

470pF

220pF

.1µF

PNP MPSA93

PNP 2N4125

PNP PN4250A

NPN 2N3859A SEL

NPN MPSA43/A42

Diode Pair

PNP 2N4125

NPN MPS8097

PNP PN4250A

NPN 2N3859A SEL

PNP 2N4125

NPN 2N4123

DIODES

C 2851-1

1N4004

Power Base-1 & 460CSL Amplifier Service Manual

Q42953-2 Main Module Parts List (D 7251-8 Board)

R135 R235 A10266-1011 100

RESISTORS

R136 R236 A10266-6821 6.8K

R137 R237 A10266-1011 100

R138 R238 A10266-6821 6.8K

R139 R239 A10266-1021 1K

R140 R240 A10266-8201 82

R141 R241 A10266-1541 150K

R142 R242 A10266-1541 150K

R146 R246 A10266-1031 10K

N100 N200 D 4669-4

N101 N201 D 6081-0

N102 N202 D 6082-8

CMR Trim Network

Resistor Network

A10265-53621 53.6K 1%

C 7340-0

24 5W

A10265-46421 46.4K 1%

A10266-3321 3.3K

A10266-5621 5.6K

A10266-4331 43K

A10266-1021 1K

R147 R247 C 7781-5

200 .5W Flame Proof

R11

R12

R13

R14

R15

R148 R248 A10266-2721 2.7K

R149 R249 C 7781-5

200 .5W Flame Proof

R150 R250 A10266-2721 2.7K

R151 R251 A10266-1031 10K

R152 R252 A10266-1231 12K

A10266-8221 8.2K

A10266-6211 620

R100 R200 C 7409-3

Pot, 5K Linear

R153 R253 C 5868-2

0 Ohm Jumper

R101 R201 A10265-49911 4.99K 1%

R102 R202 A10266-1021 1K

R103 R203 A10265-10031 100K 1%

R104 R204 A10266-2721 2.7K

R105 R205 A10266-2721 2.7K

R106 R206 A10266-1231 12K

R107 R207 A10266-6831 68K

R108 R208 A10266-1021 1K

R109 R209 A10266-8201 82

R110 R210 A10266-6831 68K

R111 R211 A10266-1231 12K

R112 R212 A10266-5131 51K

R113 R213 A10266-4721 4.7K

R114 R214 A10266-4721 4.7K

R115 R215 A10266-5141 510K

R116 R216 A10266-3351 3.3M

R117 R217 A10266-4731 47K

R156 R256 A10266-1321 1.3K

R157 R257 A10266-1321 1.3K

R158 R258 A10266-9131 9.1K

R159 R259 A10266-5121 5.1K

R161 R261 A10266-1011 100

R162 R262 A10266-1011 100

R167 R267 A10265-10011 1K 1%

R168 R268 A10265-95301 953 1%

R170 R270 A10265-10011 1K 1%

R171 R271 A10265-95301 953 1%

R174 R274 A10265-24921 24.9K 1%

R175 R275 A10265-14721 14.7K 1%

R176 R276 A10265-24921 24.9K 1%

R179 R279 A10266-4731 47K

R180 R280 A10266-4711 470

R181 R281 A10266-4721 4.7K

R182 R282 A10266-2201 22

R183 R283 A10266-2421 2.4K

R185 R285 A10266-2421 2.4K

R186 R286 A10266-1051 1M

R118 R218 C 7780-7

270 Flame Proof

R119 R219 A10266-3011 300

R120 R220 C 7780-7

R121 R221 C 5062-2

270 Flame Proof

100K Pot (–ODEP)

R122 R222 A10266-2741 270K

R123 R223 A10266-1832 18K .5W

R124 R224 A10266-6821 6.8K

R125 R225 A10266-1011 100

R126 R226 A10266-1011 100

R127 R227 A10266-6821 6.8K

R128 R228 A10266-1031 10K

R129 R229 A10266-1041 100K

R130 R230 A10266-1041 100K

R131 R231 A10266-1031 10K

SWITCHES

C 7325-1

C 7363-2

C 6781-6

Ground Switch

Sensitivity

Stereo/Mono

S100

IC’S

C 5095-2

C 5096-0

UA7815

UA7915

UPA75

UPA76

MC33084P

U100 U200 C 6911-9

U103 U203 C 6910-1

U104 U204 C 6900-2

R132 R232 C 5062-2

100K Pot (+ODEP)

R133 R233 A10266-2741 270K

R134 R234 A10266-1832 18K .5W

Power Base-1 & 460CSL Amplifier Service Manual

Q42953-2 Main Module Parts List (D 7251-8 Board)

MISC.

Board

Socket

Nut

Heatsink

Torq Sprdr

Washer

Screw

J10

J11

D 7251-8

C 3450-1

A10102-5

C 5341-0

C 6541-4

C 8973-7

C 9067-7

C 7593-4

C 4508-5

C 7527-2

C 7592-6

C 7526-4

Blank PC Board

14 Pin U104/204

Hex 6-32

TO-220

#6, Split

Stainless

5 Pin Header

16 Pin Socket

6 Pin Header

4 Pin Header

3 Pin Header

Phone Jack

Phone Jack Cover

10 Inch Ribbon

6 Inch Ribbon

J100 J200 C 6777-4

Cover C 6778-2

J500 J800 D 6619-7

J600 J700 D 6620-5

Power Base-1 & 460CSL Amplifier Service Manual

Q43060-5 Main Module Parts List (D 7993-5 Board)

Q43060-5 Applicability: Main Module for Through Hole

Chassis (THC) PB-1/460CSL units.

C151 C251 C 6806-1

C152 C252 C 6950-7

C153 C253 C 8897-8

C154 C254 C 8426-6

C155 C255 C 8897-8

C156 C256 C 8897-8

C157 C257 C 6806-1

.01µF

82pF 5%

.1µF

.1µF 250V

.1µF

CAPACITORS

C 4303-1

C 3913-8

C 6802-0

C 6806-1

C 8897-8

1000µF

470µF

.47µF

.01µF

.1µF

.01µF

DIODES

C 2851-1

1N4004

1N4148

1N3070

1N4148

1N3070

1N4148

1N3070

1N4148

C100 C200 C 5311-3

C101 C201 C 2821-4

C103 C203 C 6805-3

C104 C204 C 6805-3

C105 C205 C 6812-9

C106 C206 C 6812-9

C107 C207 C 8897-8

C108 C208 C 6814-5

C109 C209 C 7417-6

C110 C210 C 5362-6

C111 C211 C 8897-8

C112 C212 C 6803-8

C113 C213 C 8991-9

C114 C214 C 8854-9

C115 C215 C 8854-9

C116 C216 C 8991-9

C117 C217 C 6803-8

C118 C218 C 6814-5

C119 C219 C 6802-0

C120 C220 C 8897-8

C122 C222 C 6811-1

C123 C223 C 6812-9

C124 C224 C 6812-9

C129 C229 C 6814-5

C130 C230 C 6813-7

C133 C233 C 6813-7

C134 C234 C 6805-3

C135 C235 C 6805-3

C136 C236 C 6808-7

C137 C237 C 6808-7

C138 C238 C 6813-7

C139 C239 C 6813-7

C140 C240 C 6812-9

C141 C241 C 6812-9

C144 C244 C 8576-8

C145 C245 C 6812-9

C146 C246 C 6812-9

C147 C247 C 6806-1

C148 C248 C 6810-3

C149 C249 C 6808-7

C150 C250 C 6806-1

22µF

10pF

.022µF

47pF

.1µF

12pF

.0033µF

2.2µF

.1µF

.12µF

.47µF

100µF

.47µF

.12µF

12pF

.47µF

.1µF

100pF

47pF

12pF

D108 D208 C 3181-2

D109 D209 C 3181-2

D110 D210 C 3181-2

D111 D211 C 5061-4

D112 D212 C 3181-2

D113 D213 C 3181-2

D120 D220 C 3181-2

D121 D221 C 3181-2

D122 D222 C 3181-2

D123 D223 C 5061-4

D124 D224 C 3181-2

D125 D225 C 3181-2

D126 D226 C 5061-4

D127 D227 C 5061-4

D129 D229 C 3181-2

D130 D230 C 3181-2

D131 D231 C 3181-2

D132 D232 C 3181-2

27pF

TRANSISTORS

.022µF

470pF

27pF

47pF

100µF

47pF

Q100 Q200 D 2961-7

Q101 Q201 C 3578-9

Q102 Q202 C 3810-6

Q103 Q203 C 3786-8

Q105 Q205 C 3578-9

Q106 Q206 C 3625-8

Q107 Q207 C 3786-8

Q108 Q208 D 2961-7

Q109 Q209 D 2961-7

Q110 Q210 C 3810-6

Q112 Q212 C 3625-8

Q113 Q213 C 3625-8

Q115 Q215 D 2962-5

Q116 Q216 C 3786-8

Q117 Q217 D 2961-7

Q118 Q218 D 2961-7

NPN 2N3859A

PNP MPSA93

NPN MPSA43

PNP PN4250

PNP MPSA93

NPN 2N4125

PNP PN4250

NPN 2N3859A

NPN MPSA43

NPN 2N4125

NPN MPS8097

PNP PN4250

NPN 2N3859A

47pF

.01µF

180pF

470pF

.01µF

Power Base-1 & 460CSL Amplifier Service Manual

Q43060-5 Main Module Parts List (D 7993-5 Board)

Q119 Q219 C 3625-8

Q120 Q220 C 3625-8

Q121 Q221 C 7458-0

Q122 Q222 C 7458-0

Q123 Q223 C 7458-0

Q124 Q224 C 3625-8

NPN 2N4125

NPN 2N4123

NPN 2N4125

R136 R236 A10266-6821 6.8K

R137 R237 C 7782-3

100 Flame Proof

R138 R238 A10266-6821 6.8K

R139 R239 A10266-8211 820

R140 R240 A10266-6801 68

R141 R241 A10266-1541 150K

R142 R242 A10266-1541 150K

R143 R243 A10266-1041 100K

R144 R244 A10266-1041 100K

R145 R245 A10266-1851 1.8M

R146 R246 A10266-1031 10K

RESISTORS

N101 N201 D 6081-0

N102 N202 D 6082-8

Network Package

A10265-53621 53.6K 1%

R147 R247 C 7781-5

200 .5W Flame Proof

C 7340-0

24 5W

R148 R248 A10266-2721 2.7K

R149 R249 C 7781-5

200 .5W Flame Proof

A10265-46421 46.4K 1%

A10266-3321 3.3K

A10266-1041 100K

A10266-2031 20K

A10266-5121 5.1K

A10266-2031 20K

A10266-1041 100K

R150 R250 A10266-2721 2.7K

R151 R251 A10266-1031 10K

R152 R252 A10266-1231 12K

R153 R253 JUMPER

R154 R254 C 8261-7

JUMPER

121K 0.1%

R16

R17

R18

R155 R255 A10266-1321 1.3K

R156 R256 A10266-1321 1.3K

R157 R257 A10266-1321 1.3K

R158 R258 A10266-9121 9.1K

R159 R259 A10266-1021 1K

R100 R200 C 7409-3

5KLinearPot(Level)

R101 R201 A10265-49911 4.99K 1%

R102 R202 A10266-5111 510

R103 R203 A10265-10031 100K 1%

R104 R204 A10266-2721 2.7K

R105 R205 A10266-2721 2.7K

R106 R206 A10266-1231 12K

R107 R207 A10266-6831 68K

R108 R208 A10266-8211 820

R109 R209 A10266-6801 68

R110 R210 A10266-6831 68K

R111 R211 A10266-1231 12K

R113 R213 A10266-4721 4.7K

R160 R260 C 8260-9

10K 0.1%

R161 R261 A10266-1011 100

R162 R262 A10266-1011 100

R163 R263 C 8261-7

R164 R264 C 8260-9

R165 R265 C 8261-7

121K 0.1%

10K 0.1%

121K 0.1%

R166 R266 A10266-1851 1.8M

R167 R267 A10265-10011 1K 1%

R168 R268 A10265-95301 953 1%

R170 R270 A10265-10011 1K 1%

R171 R271 A10265-95301 953 1%

R118 R218 C 7780-7

R119 R219 A10266-3011 300

270 Flame Proof

R173 R273 C 8260-9

10K 0.1%

R174 R274 A10265-24921 24.9K 1%

R175 R275 A10265-14721 14.7K 1%

R176 R276 A10265-24921 24.9K 1%

R177 R277 A10265-54921 54.9K 1%

R179 R279 A10266-1321 1.3K

R180 R280 A10266-4711 470

R181 R281 A10266-4721 4.7K

R182 R282 A10266-2201 22

R183 R283 A10266-2421 2.4K

R184 R284 A10266-4741 470K

R185 R285 A10266-2421 2.4K

R186 R286 A10266-2751 2.7M

R187 R287 A10266-3631 36K

R188 R288 A10266-3631 36K

R189 R289 A10266-2731 27K

R190 R290 A10266-2051 2M

R120 R220 C 7780-7

R121 R221 C 5062-2

R122 R222 A10266-2741 270K

R123 R223 A10266-1832 18K .5W

R124 R224 A10266-6821 6.8K

270 Flame Proof

100K Pot (-ODEP)

R125 R225 C 7782-3

R126 R226 C 7782-3

100 Flame Proof

R127 R227 A10266-6821 6.8K

R128 R228 A10266-1031 10K

R129 R229 A10266-1041 100K

R130 R230 A10266-1041 100K

R131 R231 A10266-1031 10K

R132 R232 C 5062-2

R133 R233 A10266-2741 270K

R134 R234 A10266-1832 18K .5W

100K Pot (+ODEP)

R135 R235 C 7782-3

100 Flame Proof

Power Base-1 & 460CSL Amplifier Service Manual

Q43060-5 Main Module Parts List (D 7993-5 Board)

R191 R291 A10266-3331 33K

IC’S

R192 R292 A10266-1031 10K

R193 R293 A10266-1031 10K

R194 R294 A10266-1041 100K

R195 R295 A10266-3021 3K

R196 R296 A10266-4721 4.7K

R197 R297 A10266-1031 10K

R198 R298 A10266-4721 4.7K

R199 R299 A10266-1031 10K

R909 R1009 A10266-4741 470K

R910 R1010 A10266-4741 470K

R911 R1011 A10266-1521 1.5K

R912 R1012 A10266-4711 470

R913 R1013 A10266-1051 1M

R915 R1015 A10266-1001 10

R916 R1016 A10266-1001 10

R917 R1017 A10266-10021 10K

R918 R1018 A10266-10021 10K

R919 R1019 A10266-10021 10K

R920 R1020 A10266-10021 10K

C 5095-2

C 5096-0

UA7815

UA7915

UPA75

LM339

U100 U200 C 6911-9

U101 U201 C 4345-2

U102 U202 C 4345-2

U103 U203 C 6910-1

U104 U204 C 7558-7

UPA76

MC33079P

MISC.

Board

Socket

Nut

Heatsink

Torq. Spreader C 6541-4

Washer

Screw

J11

J12

D 7993-5

C 3450-1

A10102-5

C 5341-0

14 Pin

Hex 6-32

TO-220

C 8973-7

C 9067-7

C 7593-4

C 7526-4

C 7873-0

#6, Split

Stainless

5 Pin Header

3 Pin Header

2 Pin Header

Phone Jack

Phone Jack Cover

10 Inch Ribbon

6 Inch Ribbon

R921 R1021 C 9079-2

200 Pot (CMR Null)

J100 J200 C 6777-4

Cover C 6778-2

J500 J800 D 6619-7

J600 J700 D 6620-5

SWITCHES

C 7325-1

C 7960-5

C 6781-6

Ground Lift

Sensitivity

Stereo/Mono

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