Philco 40-201 - Printable Version

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Philco 40-201 - TFB - 02-18-2018

I am working on a Philco model 40-201 (should be electrically identical to a 40-195).  I have found an extra part (resistor) in the unit, it appears to be factory installed. There is a 4700 ohm resistor in parallel with the secondary of the short wave oscillator coil, see attached illustration. I am not smart enough to know what this does.  Comments from the experts will be appreciated.

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RE: Philco 40-201 - Radioroslyn - 02-19-2018

Well I'm not sure exactly why it's there but it lowers the Q of the osc secondary. I would leave it in the circuit as it was probably added to correct a problem from a earlier run that isn't documented.

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RE: Philco 40-201 - TFB - 02-19-2018

Radioroslyn,
Thanks - I think your comments make sense.

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