1939 National Recording King

Someone had bolted a huge power transformer sideways in this amp, and all the wiring around the power supply/field coil speaker had been obliterated.  I found a suitable toroidal transformer that would fit, and by some miracle found enough schematics from that time period to piece together the proper way to wire the field coil speaker in this particular circuit.  We also recapped the amp.  Now it is a working piece of history.

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