I have a Carvin TS100 tube power amp, and one of the two channels stopped working. I can still get a signal, but it's not amplified at all; you can hardly hear it. Do I just need to replace some tubes? I'm not too familiar with these things when it comes to fixing them.

Sounds like a tube problem, try changing them first then if it still doesn't work get it checked out by a tech.
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Many thanks. The tubes are over two years old, so that's most likely the problem. I'm not familiar with the symptoms of these kinds of problems, so I was afraid these might be the signs of something more serious.