I posted this in the Peavey amp club forum, but thought I'd put it here too in hopes that someone with the technical expertise might respond. I bought a Bravo new in the early nineties and loved it immediately, but I've had 2 experiences with it recently which seem to occur when the reverb is turned up all the way, I believe I was playing through the "clean" channel both times: an onset of strange volume/distortion changes followed by smoke and stinky burning plastic stench. Turning off the amp seems to restore it to normal after it's cooled off. I don't see any obvious evidence of burnt or melted parts on the amp's board. Any electronics gurus with any ideas what's up? I don't imagine these episodes are too great for the amp, and I'd like to feel that I can use the reverb safely. The Bravo has dual EL84 power tubes and 3 12AX7's in the preamp. I understand the reverb pan circuit is transistor-based with an RC4558P op-amp involved somehow. I swapped the stock RC4558P for anRC4558D temporarily under the impression someone gave me that this would improve the tone of the amp and give me more headroom. I couldn't hear any change. I believe I was told the op-amp was involved in the "ultra" gain pull-switch activated circuit, but now I'm under the impression it's actually part of the reverb. For what it's worth the RC4558 is part of the Tube Screamer pedal's circuitry too. Can't remember if this swap preceded the problems, I've put the stock RC4558P back in, but haven't had time yet to see if the problem will recur with the original op-amp back in there.