Mesa tc-50 questions

[Beezerboy]

I have a friend that uses a Mesa Triple Crown TC-50. the reverb quit. everything else is fine but no verb. I tested the tank and got an open circuit. I haven't taken it apart yet to get the tank out and see if it is fixable, but probably will in the next couple days. I tried to find information on this amp, and can not locate a schematic. can't even find a parts book. Mesa does not post either. there is no dealer or rep or approved repair shop here in AK as far as I can tell.

any help is appreciated

[jim]

That's an expensive and complex amp....If you get reverb spring sounds when you shake the amp but no reverb from your guitar the reverb output stage is working perfecty, but there is no signal to input of the tank. Often the problem is the cables to the tank are not tight or defective.  You could swap in new working tubes to the reverb section--if there is no schematic you will need to trace it out visually.  If you have any working tank around your shop you should swap it in to see if there is any trace of reverb. Don't worry if it is not the proper tank you won't hurt anything.  If you hear any reverb at all--order the proper replacement tank. If you nag MESA enough they will give in as far as parts go, but you will not get a schematic for a current production amp.  Generally reverb tanks are not worthwhile to fix. Good Luck, Jim

[Beezerboy]

so.... took it apart and found broken wire. fixed that and all good.

still.... no diagram though.

this amp belongs to a friend who is one of the best and most active players in the state. I am by default one of maybe 2 techs around here that can fix these things. the amp is 25 years old... I expect to see it again.  I would love to at least have a schematic.

I have sounded out the Mesa forum but no far  nothing

[jim]

It is usually something simple--often vibration or heat related.  You were observant and lucky.   Rock on!, Jim