I have, what is in reality, a Japan Radio amplifier disguised as a
piece of medical equipment with a pair of 3-500's. A perfect candidate
for a retrofit! The plate transformer is stenciled for 200VAC input
with an output voltage of 2400VAC. I put 240VAC on the inputs and the
voltage increased to about 2800VAC (no load) with no indication
(vibration, noise, heat, etc) that there was a problem with the over-
voltage. Based on that observation, my feeling is that it's wound for
240VAC and the manufacturer simply used it on 200VAC since that's the
normal voltage (100/200vac) in Japan. Does anyone have any
experience using Japan Radio transformers on higher input voltages? If
that's the case, will save a rewind. Thanks, Ron W2CQM/3
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