Above: The set is a “hybrid”. That’s the 2E24 power amplifier tube in the black shield on the right. The high voltage power supply generates 400 volts DC for the PA tube, 120 volts DC for the oscillator tube and -175 volts DC for the PA grid blocking and operating bias. The tube filaments are fed with square wave AC from the power oscillator. The HV power supply includes a 2-transistor voltage regulator circuit to keep the outputs within specifications if the primary input voltage went as high as 17 volts from a vehicle battery being charged by a generator. The power supply is reverse-polarity protected by a series diode. The HV power supply uses a conventional 2N174 DC-DC oscillator circuit that flips open exposing some receiver circuitry. The oscillator runs at around 2.2 Kc to keep the efficiency high but I cannot hear it in the receiver audio or in the transmitted signal. Good shielding, filtering and bypassing design here.
When the function switch is in the XMIT position the set draws 2.01 Amps, key up. Key down it draws 3.34 Amps. (both measurements made with 13.00 Volts at the power connector.) The Depot overhaul acceptance criteria state that the set must produce a minimum of 2.5 watts RF output with a battery that is down to 10 volts.
One strange test noted in the manual is to measure the acoustic noise generated by the radio while in the transmit mode, key down. The test is to be performed in a sound-proof booth with a calibrated microphone and recording system. Maximum sound pressure levels are specified for various audio frequency ranges. Presumably so the enemy could not hear the set while in operation – from sounds coming from other than the earphones. Danger Close…I have not seen that test requirement in any other radio. I wonder where that came from? I sure can’t hear anything, even the high voltage power supply oscillator.
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