steeldragonjovi
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- Jun 10, 2007
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I am having some issues identifying what tube or tubes may be causing troubles in my Mark IV short combo. Every time I turn it on, it has a constant hum on every channel, full or tweed power, and simul class or class a, plus occasionally it will crack and pop. It also pops when I turn it to standby. I watched Mesa's tube troubleshooting video and even called them, but I'm still having trouble trying to identify what's going on.
Right now I am trying to go through each of the power tubes. I put one in the first socket, turn it on, let it warm up, then flip the standby switch on and off. The video said look for flashing, arcing, or fuse blowing, but the only thing that's going on when I turn it on is every tube has a white light inside of it. I don't know if that's supposed to be like that or not, because again, every tube has it.
As for preamp tubes, I replaced the v1 with a new one, because I suspected it was the reason because the hum was on every channel. It didn't work. I moved all the others around and the sound still comes through. Is there anything else to try other than having to just buy a bunch of tubes?
Right now I am trying to go through each of the power tubes. I put one in the first socket, turn it on, let it warm up, then flip the standby switch on and off. The video said look for flashing, arcing, or fuse blowing, but the only thing that's going on when I turn it on is every tube has a white light inside of it. I don't know if that's supposed to be like that or not, because again, every tube has it.
As for preamp tubes, I replaced the v1 with a new one, because I suspected it was the reason because the hum was on every channel. It didn't work. I moved all the others around and the sound still comes through. Is there anything else to try other than having to just buy a bunch of tubes?
