Tube Amp Archive

OK, the resistor @ R142 has a brown spot in the middle. I can replace it simply enough (don't worry, the amp is already drained.) But what would have caused it to go in the first place? Is R142 burning out really enough to cause the bias to go all crazy like that? Thanks so much for your help, btw!

OK, now I'm really perplexed: I have a Fender Supersonic that, until a week ago, was a great amp! Then after changing tubes and resetting the bias, it stopped making sound altogether. So I took it home, did the "Chopstick Test", and found that when I touched the 2 straight wires that connected the s...

Weird..... now that's something I probably wouldn't have thought of!
I'm gonna have to check the bulb now! Thanks!!!

Yeah, that's along the lines of what I was thinking, actually... I guess I was just hoping that there might be some simpler solution that I wasn't thinking of. The solder joints on PIN 7 of tube V7 and PIN 2 of each of the power tubes in particular are a little " brown "... any ideas about which tub...

OK, I have a Fender Supersonic that has gone from working fine to freaking out in mere minutes, and I can't find the cause! All I did was change the tubes, set the bias for the new tubes, and when I put it back together there was no sound! Also, the tubes have started glowing blue , and I noticed th...