giantstepjoe
Well-known member
My Mark IVb combo has started giving me problems. It has an intermittent issue where there is a noticably annoying static/ crackle sound on notes played on the low E string ranging from an open E to a g#. It is most noticable on the clean channel. I tried swapping out v1,v3, and v5 with a tube known to be good and changed the power tubes and no dice. I then tried cleaning the eq sliders because I noticed that when I moved the 80 slider the noise would go away and then come back. After cleaning the sliders the sound was would go away for a short time but then it woul eventually return. Sometimes when the amp has been running for a while and is good and warmed up the sound will go away but it always returns the next time I power it up. I know I should try to change the other 12ax7s just to rule them out. Anybody encounter this issue before or have any ideas? Much appreciated.