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Fender Silverface Questions

 
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moogstar



Joined: 09 Feb 2008
Posts: 155
Location: Australia

PostPosted: Wed Aug 04, 2010 5:02 am    Post subject: Fender Silverface Questions Reply with quote

Howdy,
Two quick questions,

If you were to do a recap of a silverface amp would you repalce the bias cap or leave it?

A friend of mine had a layout diagram that shows which caps to replace for a silverface twin. I have searched the net and can not find it, any ideas or help in finding it or something similar.

cheers
Ben
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tangelolemon



Joined: 26 Jan 2009
Posts: 2691
Location: Brooklyn, NY

PostPosted: Wed Aug 04, 2010 7:55 am    Post subject: Reply with quote

Yes, replace it. If that one fails, it can ruin your day. Trust me.
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demps



Joined: 19 Apr 2009
Posts: 7
Location: Willowbrook IL

PostPosted: Wed Aug 04, 2010 8:07 am    Post subject: Reply with quote

http://www.ampwares.com/fender.asp
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demps



Joined: 19 Apr 2009
Posts: 7
Location: Willowbrook IL

PostPosted: Wed Aug 04, 2010 8:14 am    Post subject: Reply with quote

Sorry, maybe that's not what you're looking for. Basically you just need to replace all the filter caps under the pan. The rectifier cap (on the small board with the diodes) can go as well.
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Structo



Joined: 21 Nov 2004
Posts: 26415
Location: Salem, OR

PostPosted: Wed Aug 04, 2010 8:27 am    Post subject: Reply with quote

You will want to replace all electrolytic caps.
Those under the doghouse as well as all bypass and filter caps.

The bias cap is a 50uf/70v cap.
That will be hard to find so you can safely use a 100uF/100v cap there no problem.
Remember that the + end goes towards ground because you want a negative bias voltage.

The only Twin Reverbs I am aware of that have an adjustable bias is the 270 and 568.
The others use what is called a hum balance pot which just eliminates most of the ac hum.
The main filter caps may also prove to be hard to find the exact uF/v rating.
Always replace with a voltage rating as high or higher.
The difference being the higher voltage caps are usually physically bigger so take that into consideration for the ones under the dog house.

The Sprague Atoms will probably be the best bet on quality and values to use.
Be sure on the cathode bypass caps on the preamp tubes to match the uF rating to keep the tone the same.
THose are usually 25uF/25v.
If you can't find those use 25uF/50v no problem.
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Tom



ReRanch 101 Finishing Tutorial
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