Quick! Help my power amp!

[Misanthrope189]

Hey...I was playing on the clean channel at low volumes...and then all the sudden a terrible crackling/popping noise comes blasting through the speakers. I immediately shut off the amp. I turned all the levels down, fired up the amp again (it's a stereo power amp) and then slowly adjusted the levels. The left side doesn't produce any sound anymore; the right side is fine. I looked at the tubes, and they all glow when the amp runs...does a tube stop glowing if it dies? I don't know how to diagnose this. Any help would be appreciated.

Thanks!
Nick

[Josh Jackson]

Try switching the tubes around from the one side to the other.

[Misanthrope189]

Damn it...that didn't help. What's next?

Cheers,
Nick

[fett]

If you have switched the tubes then it could be as simple as a resistor (help me here) or it could be as bad as a bad output transformer. Where's Twister?

[Misanthrope189]

I'm just pissed, because I bought it used, the guy had service cards from techs showing that during the checkup everything was fine...I know sometimes these things just blow...but damn it. I checked both fuses, both fuses look fine.

Cheers,
Nick

[Twisteramps]

Tubes and fuses are all you're going to be able to do there - take it to a tech.

[Twisteramps]

Oh, also verify your cords, could be that too, but unlikely.

[Misanthrope189]

How much money do new transformers cost?

Cheers,
Nick

[CharvelRocker]

Fuses and Tubes may look ok, but sometimes thats not the case (moreso for tubes). Not all things that could go wrong make a tube appear to be not working. It could still be broken or not working correctly even if it lights up. (paraphrased from some guitar amp site I viewed a month back). On another note, have you tried it with different speakers?

[Misanthrope189]

That's an idea...I'll swap cables around and see if different speakers have an effect. I was having speaker trouble a little while ago.

Cheers,
Nick