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MS and M capacitor replacement

Posted: Sat Jul 16, 2011 7:37 am
by Nat Glick
Hey guys,
I have a quick question regarding the replacement of capactors in my MS- and M-series amps. Do I need to replace all the little bitty caps as well as the power supply/rail caps? I have read the threads in the FAQ/How-to section and see no mention of this. I'm trying to figure out what it's going to cost me to re-cap an MS-2125, an MS-275 and an M-100.

Thanks!

NG

Re: MS and M capacitor replacement

Posted: Sat Jul 16, 2011 12:21 pm
by marko
i would just do the psu caps unless there is any signs of damage to the rest ie- film shrinkage and leaking or swelling. generally it's just the psu caps that need replacing but it wouldn't harm to swap them all out..

Re: MS and M capacitor replacement

Posted: Sat Jul 16, 2011 10:07 pm
by Nat Glick
Thanks. The caps in the M100 are definitely swelling, but no leakage. No leakage in the MS2125 either but I think the big caps are starting to swell. It's hard to tell since they have been covered with a PG sticker/blue plastic wrap.

Image

What you mean by "film shrinkage"?

NG

Re: MS and M capacitor replacement

Posted: Mon Jul 18, 2011 7:46 am
by HoseHead
Ever dive into a cold pool? That's shrinkage. :shock: :shock: :shock:

The plastic film around the capacitor shrinks due to prolonged and/or excessive heat. Those look fine but I don't think they're original units for an M. They may have been done already.

Slide a cigarette paper under the cap and check for residue - leakage. It's a good insurance policy to replace them anyway.

HH

Re: MS and M capacitor replacement

Posted: Tue Jul 19, 2011 4:44 am
by Nat Glick
HoseHead wrote:Ever dive into a cold pool? That's shrinkage. :shock: :shock: :shock:

The plastic film around the capacitor shrinks due to prolonged and/or excessive heat. Those look fine but I don't think they're original units for an M. They may have been done already.

Slide a cigarette paper under the cap and check for residue - leakage. It's a good insurance policy to replace them anyway.

HH
HH,
These caps are in my MS2125. I've had it for at least 10 years. It looks like just a sticker on the top and some heat-shrink plastic around the body of the cap. I slid some paper under all the caps on all my PG amps, and none are leaking enough to dampen the paper. I did find a few drops of clear liquid around one cap, but couldn't find any more.

NG