Members denimboy Posted July 5, 2009 Members Share Posted July 5, 2009 Hi My DeVille has recently started to make a loud distortion (like a cranked Big Muff) when O play an A# on a single string. The noise comes only on that freakin' note. I tested the amp with another cab. Problem still there. I tested the amp with a different guitar. Still there.I tested the amp guitar plugged directly through the input (no effects in front or in loop). Still noise.I thought it might be a bad solder joint so I did a solder joints on Tube board. Still there. I measured the Plate Load Resistance and they're good. Schematic Diagram I'm pretty bump right now. Can it be the tubes? I know I can fix this I just need a clue! Thanks. Link to comment Share on other sites More sharing options...
Members BP90 Posted July 5, 2009 Members Share Posted July 5, 2009 start moving pre-amp tubes around... Link to comment Share on other sites More sharing options...
Members denimboy Posted July 5, 2009 Author Members Share Posted July 5, 2009 How would I find the bad one if there is in fact one ? Link to comment Share on other sites More sharing options...
Members denimboy Posted July 6, 2009 Author Members Share Posted July 6, 2009 bump! Link to comment Share on other sites More sharing options...
Members echodeluxe Posted July 6, 2009 Members Share Posted July 6, 2009 How would I find the bad one if there is in fact one ? start by turning your amp on as if you are ready to play (power on, standby on) and use the eraser end of a pencil or similar poking device and lightly tap your preamp tubes. if one of them makes a loud mechanical or popping noise in your speaker, its microphonic and should be replaced. if that doesnt yield anything, swap preamp tubes one by one to see if your symptoms are alleviated. Link to comment Share on other sites More sharing options...
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