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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