www.fairradio.com lists a 6.4volt @6.4 amp (these identical numbers suggest a
possible misprint) filament transformer with a 115Vac primary for $6.95 each.
Get a couple of these. Wire them up back-to back, i.e., connect the two low
voltage secondaries together. Pick off your needed filament voltage at the
back-to-back junction. Connect one of the primaries to a half wave
rectifier, plus filtering components, to satisfy your dc requirement. Plug
the other primary into the wall and play!
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