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Old 11th May 2009, 06:42 PM   #1
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Join Date: Apr 2009
Default Sources for Replacement Fender Filter Caps

Hello -

Looking into replacing the filter caps in my red Knob "The Twin". Can anybody give me a good source and specific info to aide in locating the most proper caps?

I've looked a Mouser but they don't seem to carry all that I need.

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Old 11th May 2009, 09:31 PM   #2
Zibi is offline Zibi  Poland
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Location: Bialystok
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Old 12th May 2009, 12:58 AM   #3
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Antique Electronic Supply has what you need. I see by the schematic your Twin uses 22@16,22@450 with 500V surge, 47@350, 100@100, and 220@285. A.E.has all of these, but for the 22@16, you would have to use 22@50, and for the 220@285, use 220@350. The higher voltage ratings will not make a difference. Probably be better.
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Old 13th May 2009, 01:30 PM   #4
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Great info and thanks for references.

I am by no means an amp tech. Just a guy with enough knowledge to be dangerous. In looking over the caps and schematic diagrams I see a few differences.

Apparently this amp may have had a cap job done back early 2000. The C110, C111 and C112 caps are 500v where as the specs call for a 450v. I am looking over the 30k 10W wire wound resistor and seeing evidence of overheating. I replaced this resistor back in 2003 - the one that in the amp had completely disintegrated. Could the higher rated voltage caps be contributing to the overheating of this resistor?

I don't own an O-scope just a multimeter. I am going to replace most of the resistors in the power sections just to be safe. Should I suspect a diode or transistor at some other point as well?

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