[Amps] Testing filament xfmr

[Peter Chadwick]

Simpler is to connect an ampmeter  across the secondary, feed the primary from a Variac and wind up the Variac until trhe desired filament current flows. then leave it for a time and see how hot it gets. The probability is that most of the losses will be copper losses: leave it on full primary with open circuit secondary to get an idea of how much iron loss there is by the temp rise.

73
Peter SM/G3RZP/P