msilvacoelho Posted November 12, 2021 Share Posted November 12, 2021 My DT-25 was making this strange noise the other day, any thoughts on what the problem is? Attached is a iPhone voice memo recording of the sound. I haven't played this amp a whole lot, I mostly use my Helix through monitors due to volume restrictions. It has never left my home. The tubes are the factory original tubes. Merriman Way.m4a Quote Link to comment Share on other sites More sharing options...
PaulTBaker Posted November 12, 2021 Share Posted November 12, 2021 It is probably your tubes. I have had a couple of DT25's and loved them... they (or me :) ) were hard on tubes. One test is to take a pencil and very carefully, lightly tap the tube, the noise should get worse if it is a bad tube. Quote Link to comment Share on other sites More sharing options...
msilvacoelho Posted November 12, 2021 Author Share Posted November 12, 2021 Thanks for the tip, I'll take to the semi-local authorized service center about an hour away for new tubes and re-biasing. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted November 15, 2021 Share Posted November 15, 2021 Very good. Sounds like microphonics, so yes, tubes and bias at an authorized service center. Quote Link to comment Share on other sites More sharing options...
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