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In Reply to: RE: Thup-thup-thup and static maybe an oscillation posted by DAK on December 12, 2016 at 19:20:48
The noise was just in the right channel at first, which is why I was trying to narrow it down by swapping the left and right power tubes and then the left and right driver tubes.
But now it looks like the noise is coming out of both channels equally.
The power tube sockets are in good shape. I just checked them out again.
Follow Ups:
I don't mean to be a pest or be insulting about this - but how did you check the sockets? And even if you did check them clean 'em well anyway!! You might be amazed at the dirt in there. It wouldn't hurt to clean the 9 pin sockets either.
If the noise is from both channels it has to be either something common to both channels (like the 12AX7) or the same fault showing up in both channels.
No worries. I used a toothpick to see if there was any dust in a few of the holes where the pins go. There wasn't. I took a hobby brush, dipped it in some isopropyl alcohol, and swabbed out the holes anyway.I've played guitar through a tube amp for a long time, so I'm somewhat familiar with basic upkeep.
If you have a better way of cleaning out the sockets, I'm all ears.
Edits: 12/13/16
You might consider using Caig Deoxit (Partsexpress carries it). It attacks the corrosion that can build up on the tube pins and the tube socket contacts.
mt
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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