OK, so I use an Ampeg SVT-3Pro and have for about 8 months now with no problems. I usually use it through two ampeg 4x10s (8ohm each for a 4ohm load... I'm not sure if this matters yet with my problem). So just yesterday I bought a 70's Ampeg 8x10 which is rated at 4ohms. When I bought it I plugged MY amp in and tested it and it sounded wonderful and all was well. Today I got it back in my house and was testing it out again, it was sounding loud and awesome and then all the sudden the amp shut down and the fans kicked into high gear. Obviously I freaked out and shut the thing off ASAP. A few minutes later I decided to turn it back on (stupid) at this point the lights on the front of the amp started flickering and then inside the amp I heard the sound of something small being set on fire and I saw a couple flashes of light from behind all the knobs. I turned it off and unplugged anything that was plugged into it (all cables, etc) and after a few minutes it started smelling like burnt electronics.......... I'm about to take it all apart and see if I can tell what happened, but I am by NO means an amp expert. Has this thing happened to other people, if so what are the possibilites as to WHY this happened and what can I do to a) fix it and b) prevent it from ever happening again. Things I've thought of: maybe the 8x10, since it's so old, got rewired along the way and is at less than 4ohms, but I don't know if this would cause this reaction in such a short amount of time of having the amp going (about 5 minutes). Maybe a preamp tube blew out? Maybe I blew the transformer? Any help is MUCH appreciated. Thanks guys.