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I recently parted out a very old Rickenbacher guitar amp from the late 30's or early 40's. I would like to have saved it, but it had been monkeyed with so much that it was a lost cause.
Anyway, I wound up with this choke. The EIA code indicates Essex, although it has the RCA logo. It has three leads, and is tapped near one end.
It was definitely used in the power supply. Any ideas how this would have been used, and why it is tapped?
I took the measurements as shown in the drawing. The inductance readings may be off, I have only a cheap LCR meter.
Thx, Al
Follow Ups:
It could be for a meissner type filter design.
dave
Dave, I think you nailed it. I have never seen that circuit before, but it was definitely s field coil design. Also interesting that the choke and field coil are in the negative side. Thanks for the info.
It keeps the entire choke at a low DC potential, and so minimizes damage in the event of a short. It filters just as well as in the hot leg.
That is common in transmitters where the voltage is several kV, but any choke should be able to handle 300-400V in an audio amp without insulation breakdown. I agree, it filters equally as well either way.
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