Ampex 375 Operation Maintenance

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AMPIEX

MODEL 375

OPERATION AND
MAINTENANCE MANUAL

MODEL 375

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INSTRUCTION MANUAL
FOR
MODEL 375 60 CYCLE AMPLIFIER

The Ampex Model 375 Amplifier is a 60 cycle oscillator and power
amplifier designed to supply a constant frequency from unstable power sources.
It will deliver 70 watts of 60 cycle power when fed from a power source having
frequency from 50 to 400 cycles.

The Model 375 is composed of two component sectionsI a precision
tuning fork controlled 60 cycle oscillator and a power amplifier. either of which
msy be used independently. The t'uning fork oscillator supplies a 7 volt 60 cy-
cle output (500,000 ohm unbalanced) with a frequency accuracy of 5 parts per
million per degree centigrade.

The power amplifier will deliver full power over a range from 50 to
75 cycles when fed from an external signal generator. The frequency range
may be extended to 400 cycles by changing one capacitor. See operation.

SPECIFICATIONS

Out ut Power: 70 Watts
Output Frequency: 60 c.p. s. when using tuning fork oscillator 50 to 400

c.p. s. when using external signal generator.

Output Voltage: 0 to no Volts. continuously variable.

In. ut ower ourcez ll? volts, 50 to 400 c.p.s., 275 watts.

filmensions: guilt to mount on standard 19 inch relay rock. Occuples 12-1/4
inches of rack space.

Weight: 60 pounds.

Front Panel Controls:

1. Output voltage control R2311
. Output voltmeter M2301

3. Output transfer switch, 52301. which allows the load to be fed
either through the amplifier or directly from the power line.

4. Indicator lamp, A2301, indicates when power is supplied to the

amplifier.

5. Stroboscope supply socket, 323035, which provides a source of
power for a two watt neon lamp.

6. Power Amplifier input jack. 12301, which allows connecting on
external signal source to the power amplifier.

7. Fuses for protection of the amplifier.

MODEL 375. Page 1
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