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FDP Forum / Fender Amps: Vintage (before 1985) / Vibrato Channel nearly dead

Black Plate

USA

Feb 15th, 2017 02:23 PM   Edit   Profile   Print Topic   Search Topic

The vibrate channel is nearly dead all of a sudden in my 67 BFSR.
Volume to ten just to get amy sound from guitar. No idle noise. Swapped preamp tubes V1 - V3 didn't help. Any ideas?

Hammond101
Contributing Member
**********

So. Cal. USA

Feb 17th, 2017 09:52 AM   Edit   Profile   Print Topic   Search Topic

If all the preamp tubes have been swapped I'd check voltages in the trem/reverb channel preamp section next if you're handy that way. If no joy it's time for a signal generator and a scope.



Black Plate

USA

Feb 18th, 2017 08:34 AM   Edit   Profile   Print Topic   Search Topic

Thanks Hammond 101. I was hoping not to take out chassis but I had a gut feeling I was going to have to. Is there anywhere I can get a schematic and or a trouble shooting list voltage points and amounts?
Thanks for your help

Richard L

Netherlands

Feb 23rd, 2017 03:31 AM   Edit   Profile   Print Topic   Search Topic

Try here

Schematic Heaven

FDP Forum / Fender Amps: Vintage (before 1985) / Vibrato Channel nearly dead




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