• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

A help with an soviet transformer.

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They used 400 Hz power on their ships and submarines. It makes for very small (equals lightweight) power transformers at a given VA rating. Unfortunately, you can't run these things on 60 Hz AC unless you de-rate the thing a lot. For all practical purposes, that transformer is useless. :(
 
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