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Topic: Question for tube amp gurus |
Tommy Boswell
From:
Virginia, USA
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Posted 17 May 2017 6:04 pm |
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My master volume pot does not work when I first switch on the amp (Carvin TS100 tube power amp). On one side only, the other side works fine. On the bad side I cannot turn the volume off, it's like the pot does little or nothing. Until the amp warms up, then it works normal.
Is that a bad pot? Or a bad solder joint? |
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Mike Wheeler
From:
Delaware, Ohio, USA
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Posted 17 May 2017 6:49 pm
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Sounds like a cold solder joint. Most times things that change from good to bad, or bad to good, after a warm-up are related to heat sensitive components, or connections. At least that's where I'd start looking.
_________________
Best regards,
Mike |
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Brad Sarno
From:
St. Louis, MO USA
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Posted 18 May 2017 9:09 am
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Check the pot, the solder joint that goes to ground. The outside lug at the counter-clockwise end of the rotation.
b |
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Ken Fox
From:
Nashville GA USA
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Posted 18 May 2017 3:41 pm
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http://carvinimages.com/schematics/TS100C.pdf
There is a12AX7 tube in that volume control circuit. See link to schematic. I have the same power amp myself. Really like mine
I would try replacing that tube as part of your troubleshooting |
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Mark Fowler
From:
Minnesota, USA
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Posted 19 May 2017 6:46 pm
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It sounds like bad solder joint affected by heat when on for a period of time.
Last edited by Mark Fowler on 21 May 2017 5:14 am; edited 1 time in total |
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Tommy Boswell
From:
Virginia, USA
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Posted 20 May 2017 4:25 am
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Thanks to all the experts who responded. Might find some time to try your suggestions when I retire.  |
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