10-02-2012, 08:58 AM
Just looked at resistor 13 and it only feeds B+ to the mixer and IF tubes.
BUT, B+ goes thru the band switches and some coil windings.
Funky switch contacts or carbon tracks in the switch wafer(s) or coil shorts could be something also to look at. Maybe a dangling switch terminal wire, some kinda short to switch frame from a solder lug on a wafer......wracking my brain....crumbled insulation on any wires in that neighborhood.....pri to sec short/leakage in one of the osc coils...still a bad ('new') 2uF cap hanging on that B+ line, below the IF tube in dwg...
It is Full Moon right now. All else fails, use the tried and true
Six-Foot Navy Drop Test Procedure.
Chuck
BUT, B+ goes thru the band switches and some coil windings.
Funky switch contacts or carbon tracks in the switch wafer(s) or coil shorts could be something also to look at. Maybe a dangling switch terminal wire, some kinda short to switch frame from a solder lug on a wafer......wracking my brain....crumbled insulation on any wires in that neighborhood.....pri to sec short/leakage in one of the osc coils...still a bad ('new') 2uF cap hanging on that B+ line, below the IF tube in dwg...
It is Full Moon right now. All else fails, use the tried and true
Six-Foot Navy Drop Test Procedure.
Chuck
Chuck Schwark,
The Philco Repair Bench
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