Help with Accomplice noise

[Robertito]

Hello - I have a noise problem with my Allen Accomplice (basically a BF Deluxe Reverb circuit). It's been going on for a few years now, and it's driving me crazy.

It makes a kind of buzz under the note when a B or Bb is played (open second string or the note below it, but it's more prominent when I play the eighth or ninth fret of the fourth string). The noise almost sounds like a ring modulator that drops in pitch, and it's also there, to a lesser degree, under the B or Bb notes an octave down. So far I've replaced all the tubes (one at a time), tightened every fastener, replaced the speaker, and disconnected the reverb - nothing seems to make a difference - I even gooped the filter caps. Does anyone have an idea about what might be causing the noise? Thanks!

[Richard]

Could be a bad solder joint. I had a similar problem, but I would describe the sound as being like the speaker cone was bumping against something at the ends of its stroke and the noise would cease when the signal decayed below a certain level. Get a wooden or plastic stick and poke around and you may be able to isolate the component with the problem. If you can twist the knobs and find a noticeable difference you may be able to narrow down your search.

[Don Moose]

If you can twist the knobs and find a noticeable difference you may be able to narrow down your search.

Exactly - is there some knob or set of knobs that change the amount or character of the noise? The source is before that knob - or it IS that knob.

Do remember about the one-hand-in-pocket-at-all-times/can't-touch-guitar safety rules while you're in there.

[Robertito]

Thanks, guys, I'll try that and let you know.