In article . net,
"COLIN LAMB" wrote:

I think the DM-32A was the designated dynamotor for the BC-453. The design
output was 250 volts at .05 amps with 28 volts input. In conversions, the
DM-32 could be used for powering it, as it had 12 volts input and the same
output.

Colin-

Back in the 50s I used a low frequency ARC-5 receiver (BC-453?) to tune
the 455 KHz IF of a National SW-54, making it a double-conversion
receiver.

The dynamotor had a 28 volt field winding that consisted of two sections
in series. It was common to reconnect them in parallel, and operate off
of 12 volts. However, that produced half the HV output. If there was
more to the mod that gave the full 250 Volts, I never came across it.

Fred
K4DII