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Philco 40-201
02-18-2018, 11:53 PM
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.
02-19-2018, 01:17 AM
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.
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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