...post WW2 the WS38AFV was replaced by the WS88AFV and WS31AFV for infantry liaison, again they needed power supplies and LF amplifiers to match the set to the vehicle and control harness audio levels, and the WS31AFV supply was available in 12 and 24V versions (by replacing the power supply subchassis in the PSU/LF Amplifier unit).
The Canadians did something similar using the CPRC26, and I think the Australians used the A510 - someone on here had a control unit with "510" on the switch!
Chris.
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