Sources for Replacement Fender Filter Caps

jl_lensman · 11th May 2009, 07:42 PM

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.

JL

Zibi · 11th May 2009, 10:31 PM

http://www.bnv-gz.de/%7Eooehmann/sch..._Schematic.gif
http://www.hoffmanamps.com/MyStore/p...R_ID=612762175

bereanbill · 12th May 2009, 01:58 AM

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.

jl_lensman · 13th May 2009, 02:30 PM

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?

Jerry

11th May 2009, 07:42 PM	#1
jl_lensman diyAudio Member Join Date: Apr 2009	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. JL

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11th May 2009, 10:31 PM	#2
Zibi diyAudio Member Join Date: Jan 2006 Location: Bialystok	http://www.bnv-gz.de/%7Eooehmann/sch..._Schematic.gif http://www.hoffmanamps.com/MyStore/p...R_ID=612762175

12th May 2009, 01:58 AM	#3
bereanbill diyAudio Member Join Date: Jan 2009	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.

13th May 2009, 02:30 PM	#4
jl_lensman diyAudio Member Join Date: Apr 2009	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? Jerry

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