Hi Bill,
Thanks for asking.
When you move the banana plug to select the new transformer, it simply replaces
the "normal" transformer. The TPC, TIU, and power monitor panel are all still
in use for that track. So, yes, you can vary the voltage. In fact, for a light
load you may want to dial the TPC down slightly to get the voltage down
to 18 volts.
Ira
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TTAT members reflector.