Muitoffa

Alright, here's what I have. A Marshall JCM2000 TSL. Owned new since 2001. When I attempt to bias it, the bias voltage contiues to rise till it burns up the tubes and/or blows the fuse, which ever comes first. It doesn't take long, 10-15 minutes from standby off. I've had it at several amp techs around town, no one has a clue. I've re-soldered every solder joint in the entire head. I have replaced just about every cap, diode, and resistor on the bias circuit. I have tried to contact Marshall multiple times but to no avail, just a refferal to KorgUSA. Does anybody have any clue what would/could be causing this to happen that I have not yet accounted for?

amplifier

Try contacting the Returns department- 01908 375411, then ask if you can be transfered to someone who can help. I don't have international service so when I tried it's a toll number and asked for a calling card number or credit card number, if that's your case make it quick. I'm sure it's an ugly per minute fee being so far away. I found the number here:

http://search.aol.com/aol/redir?src=...ion=WebResults

Muitoffa

Thanks for the reply, I don't even have long distance, much less International calling, lol. I finally got a rep at a Regional Repair center, I think out of Atlanta, but it was a number to KORGUSA Consumer Technical Support, anyway, I had "my repair guy" contact them and whomever he was talking to gave him some fresh apporoaches on diagnosing this problem, but so far we haven't had any luck. man, this seems like a problem for the books, but its probably something stupid. I've had three repair shops turn it away, they couldn't figure it out. I finally found a guy whose became a good freind and as it turns out he's one of the top guys in the area down here! This has puzzled him and after this on going issue I've turned to formus like this one for some new ideas to bounce off of him. I will post when we figure it out. Anyone with some ideas, please leave a post. Thanks!