Saving Your Caps

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Saving Your Caps

Postby Jamie on Wed Jul 22, 2015 12:45 am

Curious about keeping the filter caps in good health. I have a few amps, not all I use consistently. I try to power up all amps every month or two for about 15 minutes while idle, volume set at normal playing volume. Am I missing something or there a better way to keep em healthy? I had one pop in my 9004 power amp years ago and would like to avoid from that happening again. That happened shortly after the purchase from GC. I recapped and retubed that power amp after, it's been great ever since.
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Re: Saving Your Caps

Postby pdf64 on Wed Jul 22, 2015 7:36 am

A few minutes powered up every month or two should enable caps to stay formed.
If you slip up and miss one for a while, this method enables a non-tech to allow caps to reform without excessive overheating http://www.londonsound.org/Vintage%20valve%20hi-fi.htm
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Re: Saving Your Caps

Postby Jamie on Wed Jul 22, 2015 2:12 pm

Thanks pdf.. I'll keep that page bookmarked.
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Re: Saving Your Caps

Postby EHansen on Wed Jul 22, 2015 10:08 pm

I usually power on my 12 vintage amps every 2 months or so just to keep the caps good, even if they had a complete cap job some 1-5 years ago. Keep them in good shape,.....


10-15 years. cycle , replace all electolytic caps
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Re: Saving Your Caps

Postby Jamie on Thu Jul 23, 2015 12:18 am

Thanks guys. One more question.. Does it matter if the amps are in or out of standby? I always take them them out of standby.

I guess I should consider recapping my 69 small box, they are still original and I've had no issues with it.
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Re: Saving Your Caps

Postby Unit_1 on Thu Jul 23, 2015 3:19 am

I usually pick a new amp/guitar every few days and play that combo till I tire of it and go on to the next

I find myself playing drastically different songs/jams depending on what I pick

Standby - I've seen some people saying standby is dangerous, others say no

I say "It's on, play it!"
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Re: Saving Your Caps

Postby LD50 on Thu Jul 23, 2015 6:31 am

Jamie wrote:Thanks guys. One more question.. Does it matter if the amps are in or out of standby? I always take them them out of standby.

I guess I should consider recapping my 69 small box, they are still original and I've had no issues with it.


Most amps have the filter caps tied to the HT after the switch so the amp has to be on.
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Re: Saving Your Caps

Postby Jamie on Thu Jul 23, 2015 2:33 pm

LD50 wrote:Most amps have the filter caps tied to the HT after the switch so the amp has to be on.


Thanks for the info guys..
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