Amp Help: Troubleshooting

[phantasmagorovich]

So, a couple of days ago my amp seems to have broken down. I have not mistreated it, it has a pretty new power tube and everything was like it should be but when I try to check my new Pickups with it, it just doesn't do what it's supposed to.

What it does:

A very low hum seems audible, stays the same at all power levels and in standby.
The tubes glow.


What it doesn't:

Knobs seem not to have any effect.
No sound comes out. No pedal hiss, no guitar, no touching the tip ground hum.


I already tried switching the new power tube (KT88) with the old one (EL84), but the result was identical.
I tried unplugging the speaker and nothing changed.
I tried all the cables I own and that were fine the last time I played.

What to do? I'm at a loss.

[MEC]

Have you tried it with a guitar other than the one with new pickups?

I'd also try swapping out the preamp tubes and checking that the input jack is
still making correct contact with your cable end and see if that helps?

[phantasmagorovich]

- bring amp to guit store
- tech picks up at guitar store, checks it
- turns out it's the fuse
- I feel like a donkey

[Derelict78]

hey thats good news!

[excane]

It could have been much worse... simple fuse is actually good news!

[phantasmagorovich]

It could have been much worse... simple fuse is actually good news!

Totally, it's going to be cheap too, but it bums me out that I could've repaired that myself. Would have saved me money and I would already be abusing that EU McSpunkle tourbox.

[zRobertez]

You know? This probably isn't happening to you but yesterday, my friend brought his stuff by cause his amp wasn't working too well and we looked at it for like 15 minutes. We figured out that his guitar needed a new nine volt. Active... Never used one but it could happen.

[cedarskies]

I know that this is an old thread, but my amp seems to be in this same situation (no signal, just a low volume hum independent of volume knob). Shouts out to phantasmagorovich for not leaving the thread hanging as so often seems to be the case on troubleshooting threads on the internet. Time to find a fuse!

Assuming mine is a blown fuse too, is that indicative of a deeper issue, or was I just pushing the amp too hard or something?

My amp has started cutting out at gigs before but then always "recovers" in a few minutes or when I turn it on the next day. This was the first show it happened at without PA support to save me. Anyone else have this happen? Definitely seems to have been volume related since it has never happened at practice. (amp is a Fender PA135 into a 1x15 cab, used for bass and keyboard)

[skullservant]

I've blown a few fuses before, in the Verellen that I had. Turned out to be a blown rectifier tube that was causing it to go