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In Reply to: RE: Thup-thup-thup and static maybe an oscillation posted by Wilbur Pan on December 12, 2016 at 19:21:29
mt
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They're original to the amp. The whole amp is as it was when I first got it, except for the tubes, and the resistors which were replaced with the service I had done.
If that amp is older than 20-25 years --- those filter caps maybe drying out and not adequately filtering between stages. You could be getting some coupling and motorboating.
I had a weird noise like that coming from my speakers, turned out it was my wifi signal getting in my system somehow. So now I turn off my wifi when listening and there is no noise.
Tish
Resurrecting this thread: as it turned out, it was my wifi system causing the weird noise and static. Moving my router around fixed that issue.
Hi Wilbur.
You haven't changed out the 12ax7 from what I can tell. With the amp off, pull that first tube and turn the amp on. It would be best, whatever you do, to use a pair of cheap speakers just in case something pops.
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