I've been working on fixing up a Bogen H30 PA head. It worked when I got it, but sounded weak, and obviously hadn't been touched in decades. So, today I replaced the cap cans with individual electolytics, replaced most of the other caps, some of the resistors, put in switching input jacks, and speaker out. Tubes are 3x6SF5, 6SL7 phase inverter, 2x6L6G, 5U4G. All brand new or NOS except the rectifier at this point. I tested it every step along the way, and it progressively sounded worse. Very depressing... Here is the photofact. Schematic is first : http://www.whiteghostshivers.com/images/smokebreak/79-5-004.jpg http://www.whiteghostshivers.com/images/smokebreak/79-5-003.jpg http://www.whiteghostshivers.com/images/smokebreak/79-5-002.jpg Now it motorboats for a few seconds, then sounds incredibly harsh, and max volume is soft. If that's not bad enough, R33 continues to smoke and burn up, with all tubes in. This is obviously a symptom, so I'm hoping you all can point me in the right direction of possible causes. With all tubes but the rectifier pulled, I'm getting 520VDC on the plates, and B+ around 480V. When all tubes are in, I can't leave it on for more than a minute without R33 smoking. Iron is a monster in this amp, schematic values are 420VDC plates. I say this because while the voltage is high with no tubes, my PT and rectifier seem OK. The stock R33 started smoking as soon as I installed the new 5uf filter caps, but I seem to be getting proper B+ at every node, that is until R33 smokes and everything goes to hell. Thoughts?