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Philco 20, 70, or 90 field coil impedence?
Radioroslyn
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#7

06-19-2017, 06:58 PM
I suppose in the big scheme of things what I would look for is a 10-20H choke at 40ma or better. Since it's in the HV side rather than the bias the resistance isn't super critical but will have an effect on the amount of HV. A series resistor is probably a good idea to equal out the total resistance to the original. Would keep the input capacitor at the same value but if hum is an issue then increase the size of the output capacitor.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
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RE: Philco 20, 70, or 90 field coil impedence? - by Radioroslyn - 06-19-2017, 06:58 PM



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  1. The PHILCO Phorum
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