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is observed on the oscilloscope.
Console Amplifier.
Distortion Analyzer
Audio Oscillator
| Oscilloscope
VTVM
AC Wattmeter
AC Ammeter
(0 to 10 amps)
Line Voltmeter
(0 to 150 vac)
Variable Autotransformer
(0 to 140 vac, 10 amps).
Shorting Plug
Power Supply Bleeder
Resistor (10 ohms at 1 W)
Output Load Resistor
(8Q + 0.5%, 100W)
Output Load Resistor
(49 + 0.5%, 100W)
Manufacturer and Model No.
(or equivalent)
Hewlett Packard, Model 331A
or 333A
Weston Model CVO-100P
(NOTE:
Less than 0.02 per-
cent residual distortion is re-
quired.)
Tektronix, Model 503; Data,
Model 555
RCA Senior Volt-Ohmyst,
Model WV-98C
Simpson, Model 390
Commercial Grade
Commercial Grade
Powerstat, Mode! 116B
Use phono plug with 600
ohms across center pin and
shell.
Commercial Grade
Commercial Grade
Commercial Grade
Adjust the trimming resistor R708 for equal clipping level.
Measures distortion and vol-
tage of amplifier output.
Sinewave and squarewave sig-
nal source.
Waveform analysis and trou-
ble shooting.
Voltage and resistance mea-
surements.
Monitors primary power con-
sumption of amplifier.
Monitors amplifier output un-
der short circuit condition.
Monitors potential of primary
power to amplifier.
Adjusts level of primary power
to amplifier.
Shorts amplifier input to elt-
minate noise pickup.
Discharges power supply filter
capacitors prior to disassembly
or resistance measurements.
Provides 8-ohm load for ampli
fier output termination.
Provides 4-ohm load for ampli
fier output termination.
Table 1. Test Equipment Required for Servicing
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