marshall jcm-800 50w troubleshooting help!!

[dtobian]

I am trying to troubleshoot my marshall head. after a period of time,about an hour the amps power shuts off. not sure were to start? is this a tube problem or a transformer problem? i also have a marshall valvestate 8200 that is blowing the fuse. could use a little advise. keep em comin

[jcollins]

I am trying to troubleshoot my marshall head. after a period of time,about an hour the amps power shuts off. not sure were to start? is this a tube problem or a transformer problem? i also have a marshall valvestate 8200 that is blowing the fuse. could use a little advise. keep em comin

What do you mean by "amps power shuts off"?

Does the fuse blow? Does is lose power?

[dtobian]

What do you mean by "amps power shuts off"?

Does the fuse blow? Does is lose power?

looses power!!

[dtobian]

the main fuseholder had a short!! took a long time to troubleshoot

[Don Moose]

the main fuseholder had a short!! took a long time to troubleshoot

The simple stuff always does. Seriously. It took me over a week to find a loose power supply connection in one thing I was working on.