I own a JCM 900 4101 Dual Reverb Combo. never really liked it all that much in the first place, but I would like to have another amp available to me. I own several other amps but only 18 watt amps. I have some friends who like to rawk so having a 100 watter is cool incase I need to make them cry. There are some things I like about the amp and its actually sounded <very> nice at times. They go for about $500 used. Ive been quoted roughly $300 + to get it fixed. I really dont want to spend that much. Heres the good part. There is a master electrician that works with me that would love to help me out. He doesnt know anything about guitar amps but he is a master electrician after all. A circuit is a circuit. He is willing to trouble shoot it and replace whatever needs replacing. However, he has no idea how to trouble shoot it! Heres what happened. Went to a jam, plugged in amp, put it on standby. Came back 20 minutes later, smelled a burning smell, turned off amp, realized speaker harness had come loose meaning that the transformers were running w/no load, cried as it was my only amp. Fuses are fine. Visual inspection doesnt show anything unusual. No exploded caps or anything like that. The amp has been sitting for a couple years but when I tried it the night after the incident there would be a bit of sound (very low volume) and the burning smell. I tried it the other night and there was no sound at all and no burning smell! Can someone tell me what to tell the electrician to look for? How does he go about checking the transformers to see if they still work? I assume that is the problem. Thanks!