seti Posted September 20, 2004 Share Posted September 20, 2004 What causes a preamp to go microphonic? or at least I think that is the right term. I was listening to some tunes and noticed an odd sound which I hadn't heard so I turned off the preamp and it went away. It was a feedback sort of a buzz so after I turned it back on I tape the rack it was on and the tapp tapp tapp came out of my speakers grrrr. I did the same to the preamp and it came through the speakers yet again. I rolled tubes swapped interconnects but to no avail. It is not always like this but often enough to make me coo-coo for coco puffs. Any ideas? Thanks, Seti Quote Link to comment Share on other sites More sharing options...
seti Posted September 20, 2004 Author Share Posted September 20, 2004 Sorry I should know better than to post before having my morning coffee. It is the George Wright WLA12A which I have been very happy with. The tube compliment is 2x 6SN7 Sovtek 1x 6EM7 Sylvania 1x 6X5 Mullard. I did roll the tubes.I will work on isolating the preamp. Thanks, Seti Quote Link to comment Share on other sites More sharing options...
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