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Philco 71B Code 125 speaker thumping
morzh
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#20

02-13-2026, 04:37 PM
I was trying to see if the grid cap has bad cold solder spot , so if you press it with a rod something changes pr it doesn't.
Finger is connected to you and presents all kinds of things, from capacitance to GND to an antenna signal.

Tracer would be nice. Or a scope.

Could you possibly swap the two 44 tubes places? (RF and IF)
I understand you tested them, but there are some strange things.

As for the voltmeter I mentioned, in case nothing else is indicative, it could tell us where the oscillation starts.

The oscillator is also a suspect.

PS. Have you confirmed the continuity of all RF coils?
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RE: Philco 71B Code 125 speaker thumping - by morzh - 02-13-2026, 04:37 PM



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