In comparing early and later R4C power supply schematics, a capacitor (C201) was added going from the output of the low voltage diodes to the high end of the filament string. It is listed as 20uf 150V. I am attaching a schematic showing it. I was wondering what its purpose was and why it was added. Does anyone have any ideas? I thought it might have something to do with audio hum.?
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Doug, WA3DSP
Doug Crompton WA3DSP
