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I have a problem with my JCM800 2203.
To start off I was in a horrible car accident and was not able to go to band practice for about 3 and a half weeks.
I went to practice the night before last. We ran through the 35 min. Set took a break, jammed out, and ran through the set again.
I ALLWAYS keep my Master Volume at 4, and The PreAmp at 10
The second time though the set: Halfway though there is one song where change my tone. I set the MASTER to 10 and the PREAmp to 4.
I did this and my amp turned off after about 10 seconds. I thought it blew a fuse. The amp would not turn back on.
Took it home checked the fuses. The where ok.
The next day I plugged it up. It powered up. I played for a little while getting it louder and louder. So far so good. Set the Master Volume at 4, and The PreAmp at 10. Still no problems.
I set the MASTER to 10 and the PREAmp to 4. Hit a note and the amp turned off immediately. Tried to turn it back on. Nothing.
Can anyone give advice? Could it be tubes or the OT?
Hopefully the amp will power up again so I can check the bias. (It was set about 2 years ago with a new set of tubes that are still in it).
Am I damaging the amp?
What should I do?
I have a show to play on sunday. I want to try to borrow an amp, but nothing sounds quite like my 800 i love it.
To start off I was in a horrible car accident and was not able to go to band practice for about 3 and a half weeks.
I went to practice the night before last. We ran through the 35 min. Set took a break, jammed out, and ran through the set again.
I ALLWAYS keep my Master Volume at 4, and The PreAmp at 10
The second time though the set: Halfway though there is one song where change my tone. I set the MASTER to 10 and the PREAmp to 4.
I did this and my amp turned off after about 10 seconds. I thought it blew a fuse. The amp would not turn back on.
Took it home checked the fuses. The where ok.
The next day I plugged it up. It powered up. I played for a little while getting it louder and louder. So far so good. Set the Master Volume at 4, and The PreAmp at 10. Still no problems.
I set the MASTER to 10 and the PREAmp to 4. Hit a note and the amp turned off immediately. Tried to turn it back on. Nothing.
Can anyone give advice? Could it be tubes or the OT?
Hopefully the amp will power up again so I can check the bias. (It was set about 2 years ago with a new set of tubes that are still in it).
Am I damaging the amp?
What should I do?
I have a show to play on sunday. I want to try to borrow an amp, but nothing sounds quite like my 800 i love it.
, you likely have an internal thermal cut-out, which I didn't think JCM800's had. I have seen old Plexis have a stupid one-shot fuse inside the power transformer, and a simple nuisance blowing rendered a transformer useless. There was some Fender stuff that had thermal fusing as well, but JCM800's? 
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