02-20-2006, 09:55 AM
Oscillator tube seems fine and working on SW bands (from your msg above), so checking the "plate" will not show anything, unless the voltage there goes away on AM mode which points to a band bandswitch contact(s) problem.
Perform continutiy checks on the bandswitch contacts, the BC band oscillator coil windings, and wiring associated with the bandswitch contacts for the BC circuits.
SW is working and the set works in SW. It's obviously the AM portion that's got a problem; dirty/open/loose/shorted bandswitch contacts; mis-wired BC osc coil/padders, etc.
Also check for dirty/shorted padder/trimmers in the BC osc circuit.
Perform continutiy checks on the bandswitch contacts, the BC band oscillator coil windings, and wiring associated with the bandswitch contacts for the BC circuits.
SW is working and the set works in SW. It's obviously the AM portion that's got a problem; dirty/open/loose/shorted bandswitch contacts; mis-wired BC osc coil/padders, etc.
Also check for dirty/shorted padder/trimmers in the BC osc circuit.
Chuck Schwark,
The Philco Repair Bench
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http://www.philcorepairbench.com
