I'm looking for a second opinion of sorts, I recently got a new amp - I won't mention the manufacturer just yet, as I don't want to badmouth him, as I expect him to make this right. The first few times I played it, there were some intermittent sounds I couldn't pinpoint, so yesterday I finally had a chance to mess around with it to pinpoint what is causing the problem. It has a long Accutronics tank, which I think the problems are originating from. The symptoms: 1) with the reverb on, the volume drops a bit, and turning the reverb up reduces the volume further. 2) with the reverb level past about 50%, it gets some strange microphonic sounds. 3) with the reverb level past about 65-70%, the sound cuts in and out on pick attack. 4) with the reverb off, there is a very loud mechanical clanging from the head at certain bass frequencies, which goes away when I take the head off the speaker cabinet. I am far from an amp expert, but am pretty handy, and it seems to me that 2-4 could all be caused by a loose spring or something inside the reverb tank. Item 1 may or may not be normal - it is a slight drop in volume and I wouldn't have even noticed it if I weren't investigating the reverb in such great detail. Do you amp experts think I am on the right track here? I don't want to pull the thing apart before I hear back from the manufacturer on the email I sent yesterday, but I thought I'd bounce my theory off the group.