Re: Replacing filter caps

Al wrote:

I am replacing the filter caps on my Fender silverface PA-100 amp. The old caps are original and have leaked. The values are three 20uf
@ 500 v and two 100 uf @ 350 v. I can buy exact replacement values
from Antique Electronic Supply, but should I up the voltage or
capacitance?


How long did the originals last? If they lasted 'long enough', go for exact replacements.

I agree, or higher voltage if original isn't in stock. But I think I read David to say original VALUES. Just be aware that I bought some electrolytics based on values and was shocked at how small they were. I don't know if they will last as long as larger caps or not.


Do not increase the capacitance, the start-up surge may kill the rectifier. Oh, for the avoidance of doubt, I don't know if this amp is tube or SS rectifier as I've never worked on one! Anywoo - If it sounds OK with the original values you might as well stick with them.

Increasing the voltage rating? I guess you could. But the cans might be bigger than the originals.

Do you want to keep this amp as 'an original', or is it a gigging amp that just has to work?

Al.
.

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