37-650 Current Symptoms

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37-650 Current Symptoms

Chuck Schwark
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Posts: 1,703
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Joined: Sep 2005
City: Evanston, IL

02-20-2006, 10:55 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.

Chuck Schwark,
The Philco Repair Bench
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Messages In This Thread

37-650 Current Symptoms - by Robbie Roberts - 02-19-2006, 07:59 PM

[No subject] - by Robbie Roberts - 02-20-2006, 12:59 AM

[No subject] - by Robbie Roberts - 02-20-2006, 03:01 AM

[No subject] - by Chuck Schwark - 02-20-2006, 10:05 AM

[No subject] - by Robbie Roberts - 02-20-2006, 10:43 AM

[No subject] - by Chuck Schwark - 02-20-2006, 10:55 AM

[No subject] - by Robbie Roberts - 02-20-2006, 11:15 AM

[No subject] - by Ron Ramirez - 02-20-2006, 11:33 AM

[No subject] - by Robbie Roberts - 02-20-2006, 11:36 AM

[No subject] - by Ron Ramirez - 02-20-2006, 03:37 PM

[No subject] - by Robbie Roberts - 02-21-2006, 01:01 AM

More info - by Robbie Roberts - 02-21-2006, 11:05 AM

Further Results - by Robbie Roberts - 02-21-2006, 11:54 AM

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