My Amp Blew a Fuse. Why. (Solved)

Yarko · Post by **Yarko** » Tue Jan 18, 2011 2:05 am

So, I was playing my twin reverb and noticed that when I turned the reverb on with the footswitch, a loud hum would be emitting and no reverb could be heard. So I turn everything off, remove the metal thing from around one of the smaller tubes to check that it hasn't burnt out, turn everything on again. All the power tubes and the one small tube burn orange and then blue as I switch from standby to on and then a slight pop and all the tubes go out. I check the fuse to see if it had burnt out, it had. What could have caused this problem? I've never had anything go awry with this amp, since I got it over a year ago.

Rox · Post by **Rox** » Tue Jan 18, 2011 6:27 am

You prolly just need new tubes . And when you put in tubes use a sock or something . Don't et the oil from your fingers get on the glass . If so it contributes to tubes burning out . The oils on the glass make the tubes burn hotter . Sounds stupid but it's pretty true . Plus moving and banging around the amp doesn't help .

I doubt you have a short or anything . Buy new tubes .

Yarko · Post by **Yarko** » Tue Jan 18, 2011 2:08 pm

Thanks. But do I need to get them biased professionally?

Yarko · Post by **Yarko** » Sun Jan 23, 2011 12:56 am

Right, I sorted it out today. Went, bought some new fuses. Reverb wasn't working and the hum was still there after I replaced the fuse. Then I realized that it was the foot-switch that was causing the problem. Switched the two RCA jacks with the inputs and everything worked fine but reverb was actually vibrato and vibrato was actually reverb on the footswitch. Then I switched back and the hum was still there. Then I looked at the RCA wires going to and fro the reverb tank, they were kinda loose. Pinched them a bit with my fingers and everything was fine again. Hope this can help someone else in the future but, in reality, they will probably start a new thread.