Phase Linear 4000 Service Manual

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II.
III.
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VI.
VII.

4000 Service Manual

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CONTENTS

Specifications

Circuit Description
Schematics and Design History
Disassembly

Test and Alignment Procedure
Troubleshooting Guide

Service Bulletins

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I. TECHNICAL SPECIFICATIONS

Total Distortion: Less than .25%.
Typically .02%.

Total Noise: High Level: 95dB
below full output. Phono:
72dB below full output.

Input Impedance: Phono: No less
than 47k from 20 Hz to 20k Hz.
High Level: 50k.

Gain: Phono: 65dB.
lSdB.

Output Voltage: Full output 8
volts R.M.S. Better than 2
volts into 4.7k or greater.

Fre uenc s onse: Phono: Within

:_.5d RIAA om 20 Hz to
. Le el: Within 1
31. rom 20 Hz 2...

To e Controls: Bas :
cally i reaigng and decr 5
ing, dual hi e points, :_8dB
at 20 Hz. Hinge dlnts
switch selec bl b.
at 40 Hz or 0 Hz.
Monotonically increasing and
decreasing, dual hinge points,_
:_8dB @ 20k Hz. Hinge points
switch selectable beginning-at

2k Hz and 8
Active @ualizmm
boost below 50 Hz.
Peak Unlimiter: (Nominal peak un-
limit rate attack threshold,
front panel variable) .SdB/
microsecond for + 6dB peak un-

limit operation.

High Level:

Nominal Amplitude Attack Threshold:

.2 volts peak at input to peak
unlimiter.

Downward Expander: Downward ex-
pansion commences at -- 35dB.
Ultimate limit is -- 4ldB. Un-
limiter window is 3SdB wide,
upper and lower thresholds are
simultaneously variable by
front panelunlimit threshold

control.

Four Channel Facilities: Built in
CBS SQ system with Phase Linear
developed differential logic
for enhanced four channel separ-
ation.

Semiconductor Complement: 45 tran-
sistors, 9 integrated circuits,
57 diodes, 2 zener regulators, 2

light emittin diodes.
Auto Correlator Noise Reduction
5 stem : H1g requency no1se

reduction commences at 2k Hz and
is 3 dB, reaching lOdB from 4k Hz

to 20k Hz. Low frequency noise
reduction begins at 200 Hz, ulti-
mately reaching 20dB @ 20 Hz.
Passive subsonic filter rejection

of -- 35dB @ 5 Hz. Weighted
v r ll noise reduction is -- l0
M20 Hz to 20k Hz.

IapeB on or: Mpe sw hes per-

mitting any sourc $be-re-

rded on efler of twAa
gines, ply back select1on of

ither1ne, or c of tape
machinft)
a thir sour . .

Power Swifithin

pa 6 of switching

anteres

tion: Preamplifier: 40

Size. l9.uide x 7" high x l0" deep.
Height: 18 pounds. Warranty; three
years, parts and labor.