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Tube Pre-amp Noise problems HELP

Does anyone know or have the knowledge about static sound in a tube pre-amp? How this happens, why it happens what could be done to fix this problem.
This is my 5th tube pre-amp. First was a Conrad Johnson PV10A, the moment I switched the tubes, I heard a very very annouying static sound. I cleaned the tube pins and sprayed clean the tube sockets it helped a little but the problem existed. Audio Research LS7 had no issues. Then Conrad Johnson PV10B I had the same problems as the PV10A, I sent to conrad Johnson and got it upgraded and yet the problem existed. Then I tried a Sonic Frontiers SFL-2 SE again this static issue came after some time, this time I did not change the tubes. Now I have a Audio Experience A1 and the moment I switched the Original tubes I heard the annoying static sound, I switched back to original tubes but problem exists. They all have the same kind of hiss. Some call it tube stress, I dont know what it is. Even when I switch the tubes the hiss still continues, suddenly it goes away but eventually it returns. Can anyone help me on this?
dseanm

Showing 1 response by tvad

tvad
9,467 posts
 
To have the identical problem with different tube preamps and different tubes points to an issue other than with the preamps.

Perhaps it's an issue with your power delivery, or your amplifier...or the cleaner as Jea48 says.

I'm guessing the annoying static you're describing is normal tube hiss.

Have you ever experimented with a solid state preamp...or source direct to your amplifier? If so, did you hear the static?
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