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Drivin' me Crazy

I have a buzz coming through my preamp that is intermittent and only through the phono stage. I can tap the preamp and it goes away for a little while but always returns. I have a TAD-150 signature, a tubed pre with two input tubes, which is otherwise excellent sounding. I have changed tubes, inverted my turntable plug and checked and double checked my ground. I also have tightened every screw on the preamp. It seems to get better when I put pressure or weight on the top of the preamp. Any other suggestions?
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santanaali
78 posts
 
I had the same issue with a phono pre. Nothing I could do fixed it and finally sent it in for repair and upgrades. I went through that self fix roller coaster for months, my suggestion if you cannot track it down in a day or two send it in for repair.
good luck!
swampwalker's avatar
swampwalker
5,138 posts
 
I'm guessing it is a mechanical transformer buzz. Try tightening the hold down and maybe applying some mortite or other damping compound. These can be difficult to stop.
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hoopster OP
184 posts
 
I tightened the transformers and the power supply and life is indeed better. It is not gone completely but we are on the right track.
markus1299
252 posts
 
I had the same thing happen between my pre and phono stage and went through all the possibilities for the fix. When I changed the interconnects, it went away.

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