Sounds like you've had this amp for a while. If you only hear the noise (microphonics) because you intentionally rapped the side of the amplifier, I would do nothing. If you hear it while the amplifier is sitting quietly, absent of any external forces, than I would consider following Nsgarch's advice. Personally, I would not chance placing anything within the amp that could potentially melt. I have even read somewhere that you should not use tube dampers on output tubes because of the heat factor. In my experience, I have been fortunate in that I have never had microphonic problems with output tubes in my amp. Wish I can say the same for the smaller gain tubes in my preamp.
kt88 base temperature
hi , the other day I noticed that when I tapped the side of my tube amp , I could hear my output tubes ringing and rattling, as if they were rather loose. I know that loose
connections are not good for sound , it causes distortion.
so my solution to dampen the tubes was pure silicon tape, rated to at least 500 degrees rapped around the base of the tube, now when I tapp my amp it is dead quite, but I am worried about how hot the base of the tube might get , I dont want melted crap in my amps. has anybody else tried this ? could rapping the metal base at the bottom of a kt88 cause shortened tube life ? If this helps the sound I will let everyone know how It turns out. thanks, chris
connections are not good for sound , it causes distortion.
so my solution to dampen the tubes was pure silicon tape, rated to at least 500 degrees rapped around the base of the tube, now when I tapp my amp it is dead quite, but I am worried about how hot the base of the tube might get , I dont want melted crap in my amps. has anybody else tried this ? could rapping the metal base at the bottom of a kt88 cause shortened tube life ? If this helps the sound I will let everyone know how It turns out. thanks, chris