Quote:
Originally Posted by dagskarlsen
The German phones used it: The WWii field telephone FF-33 used the same circuit, with a test button
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As I understand it, the Soviet TAI-43 was a 'rip-off' of a captured German FF-33 and is a pretty robust design. I think the German instruments used different speech battery voltages, though.
Although a WWII design, my TAI-43s date from 1959.