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Old 17th February 2009, 08:32 PM   #1
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Default filter cap question

I need to recap my sovtek mig 60, but the 3 main caps
are 100uf/ 30uf-350v cans and i can't find replacements
anywhere. Is the a suitable substitute?
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Old 17th February 2009, 11:00 PM   #2
Trout is offline Trout  United States
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Default Re: filter cap question

Quote:
Originally posted by burntheflags
I need to recap my sovtek mig 60, but the 3 main caps
are 100uf/ 30uf-350v cans and i can't find replacements
anywhere. Is the a suitable substitute?

They list a 100uf/30uf - 475V on the Vibroworld website.

Cap Page

You might need to call them to confirm the order, The owner spends a lot of time on tour.
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Old 17th February 2009, 11:14 PM   #3
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geez, 35 bucks a piece is pretty steep.
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Old 17th February 2009, 11:23 PM   #4
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Quote:
Originally posted by burntheflags
geez, 35 bucks a piece is pretty steep.
Typical for a decent can, unfortunately.
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Old 17th February 2009, 11:34 PM   #5
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this may be a stupid question but what would happen if i replaced them with JJ 100uf/100uf cans. i know that increases the capacitance by about 53% but what effect would this have on the rectifiers?
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Old 17th February 2009, 11:37 PM   #6
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What makes you think the caps need replacing in the first place?
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Old 17th February 2009, 11:41 PM   #7
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The power tranny is making a loud hum whem the standby is turned on and the amp puts out no sound. The noise comes from the tranformer itself! From what i read this is probably a shorted filter cap. Anyways i wanted to try replacing them to see if it helps before tracking down a new PT.
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Old 18th February 2009, 12:02 AM   #8
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Those caps should be for the B+, which is disabled when in standby. In standby, those caps aren't doing anything.

Is this humming transformer a new problem? Any other symptoms?

Does it hum when out of standby and ready to play?
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Old 18th February 2009, 12:09 AM   #9
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What i mean is that the tranny makes a very loud hum when the standby is turned off and ready to play and produces no sound through the speaker. So that makes me think it is related to the B+. Sorry for the confusion.
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Old 18th February 2009, 12:56 AM   #10
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Could be just a noisy transformer along with another problem which is killing the output.

Know how to drain caps, handy with an ohmmeter? Got a copy of the schematic?

Looked inside the chassis? Anything burned, smelling funny?

It might be fun replacing the cap cans, but spending $100 on 'em just to find the O/T is shorted would diminish the euphoria. And if you are not handy enough to do some basic fault finding, you might find replacing the caps a moisture releasing experience.

Ever worked on electronics?

Check the simple stuff. All tubes light? Patch cable to the speaker cab is good (the Mig is a head, isn't it?) Just this weekend I opened up the belly of a guitar amp, only to find my guitar cable was shot. Usually, I am smarter than the average beer, but sometimes not...
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