While I have been active in electroincs since 1962 I
managed to miss Nuvistors. Started wtih regular tubes
(valves) and went on the bipolar and FETs. Is it reasonable
to find a plate voltage of about +30V?

I was recently given a RCA multiset coupler that uses Nuvistors.
The primary in the power is open. I disasembled the transformer,
but the open is not in the first few layers. A friend is going
to rewind it, he rebuilds vintage tube guitar and HiFi amps.

Whne I inspected the rest of the circuitry I found the power
supply caps rated at 50V. the faded and amost unreadiable schematic
on the inside cover give the plate voltage as 30V +/-5. I owned a
R392 which used special tubes with plate volatage of 26.5V, but
I have never seen "normal" tubes operated at this low a voltage.
Heck I can power the unit with 3 9V in series for testing.

My wife has scanned the image and is using photshop to "enhnace"
it. Almost like a CSI program.

Anyone in the group ever work with Nuvistors and can offer any
information on the usual plate voltages?

I will be away from the net until saturday morning.

Terry