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Combo Amp Cutting Out/Overheating

Hi all, (those not interested in background, skip to the second-to-last paragraph)

Background: I recently formed a new band with some long-time friends of mine, and will hopefully be gigging on a regular basis. I've been playing for about six years and have had experience in small combo groups, jazz bands, musicals, band/orchestra, etc. But most of these gigs were either one-offs, or in a school setting where equipment was provided.

My primary amp, for practice and performance (thus far), has been a Carvin Pro Bass 200. For those who aren't familiar, it's a rather large combo amp: 160 watts, 15" speaker, and a tweeter/pad. I really love the sound that I can get out of it and the fact that it has output jacks in the back that, it appears, can be used to utilize this amp as a head and stack it with some smaller (like 80W) combos. This is especially important to me as a college student with a shoestring budget.

As noted above, I haven't actually needed to use my own equipment very often. But with the new band, I'm going to need to start. But my Carvin has proved to be somewhat temperamental. On occasion, while playing, the amp will cut out and I'll have to turn it on and off to get the sound to come back. Additionally, the amp head (I know it's a combo, but it's essentially a head and small cab in one) seems to overheat when playing for half an hour or more.

Any ideas on what could be wrong with the amp, or anything I can do to fix/prevent these issues? I know it's not the bass or cable as both have been replaced over time and the occasional amp issues persist. Sorry for the long intro, but I wanted to make it clear that, if at all possible, I'd rather not do away with this amp.

Thanks all :)
 
Thanks for the responses so far. In response to BassmanPaul's questions:

I don't think so

I've had it for several years and bought it used.

No, and I'm not sure about previous owner.

No, but I'd like to learn.

Thanks :)
 
Some amps have a thermal shutdown safety circuit.
When it overheats the safety circuit shuts off the power amp.
When it does this the pre-amp output is still on for a DI output.
When it cools down the safety shuts off and power amp turns on.
Are you over driving it for several hours at a time?
 
I have recently had an amp where the fan stopped working. My combo would play for about 30 min and once it got hot, it would cut off. After it cooled down, you could play the amp again. Something as simple as that, dont' over think it
 
A replacement fan is a cheap fix if there is an issue. On my old SWR Workingman's 15 (which had no fan), I had a few occasions on hot outdoor gigs where it would shutdown. I bought a $10 clip-on fan to blast at the amp and that seemed to stop the overheating situations.
 
Thanks for all the responses :)

I finally got around to taking out and cleaning the head. Surprisingly, it wasn't all that dirty. I'm starting to think the amp has been overheating because there's no fan. So now I'm working on installing a fan. If anyone has any tips or could link any threads that give advice with this kind of tinkering, it'd be much appreciated!
 
Have you actually verified that it is overheating? That's the FIRST step of any troubleshooting... identify the actual cause BEFORE proposing a solution.

Hint... it's probably not overheating.
 
I had an amp that would go silent after 15 minutes or so and I thought it was over heating. Cleaned the effects loop jacks and it never did that again.
Put a cable into the Effects send and return jacks and see if that works. If it does then they need cleaning. Get a can of Deoxit and give a couple short sprays in all your jacks, a little goes a very long way. Then put a plug in and out a few times to work it in.
Do not use any other cleaners. Click Invalid Link Removed for Deoxit.
 

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