Help with Vox AC30 CC2

[phase100]

Lemme try and explain this. Also, sorry if this is common. I've been gigging for years with an old Traynor and have never experienced this.


When I turn on the amp there is a whoosh of soft static like shshSHSHShshsh, then fades. When I play low notes I also hear the same whoosh as the note decays. Finally I hear the same thing when I put the amp into standby. I replaced all of the preamp tubes and it still does the same thing. The amp sounds great otherwise. I've been gigging with the amp since last February, including a 22 date tour. I crank it pretty good, no metal though, and no humbuckers. No drive pedals really either. Let's see, err, I can't really think of any other relevant info. Oh, got it from guitar center off the floor, so I have no idea how many times "For Whom the Bell Tolls" has been raped on it. Also, tube rectifier.


Ideas? Suggestions?

[pecorporation]

Replace output tubes with a matched set.

[kg]

though it's never a bad idea to swap tubes (as rg pointed out, there's a reason they're mounted in sockets!), what your describing SOUNDS to me like a bad plate resistor.