tube amp burning smell...

[joninc]

hey audiomigos.

my little SF fender vibrochamp is giving off a burning smell but appears to be working fine... it started a little while ago and i haven't used it too often so i keep forgetting about it.. until i turn it on again. Obviously I don't want to damage it further so it's off now.

Can't see any actual smoke - tubes aren't doing anything weird... but it's definitely smelling bad and has done so a few times now - once I did use
it for probably 1.5 hours or so so it's not some dust that's burning off or anything either.

what should I be looking for?

Does this sound like a tube issue or something in the circuit?

[A.David.MacKinnon]

Caps maybe? Sounds like it needs a trip to the tech.

[vernier]

Yep .. possibly needs a new cap. So yeah ...trip to an amp tech.

[vernier]

Hey tell us when you have it fixed ..I have the same problem with a guitar amp and curious what you've found.

[Recycled_Brains]

Very different amp, but I was tracking with a V4 once, noticed a burning smell (not dust)... when I looked in the back, one of the tubes was glowing like a 1000w light bulb. Actually melted the socket.

I'm guessing you would have noticed something like that, but figured I'd mention it.

[joninc]

yeah - i didn't notice that any tube was looking unusual...

My tech is back in the next week so I'll report back once I know more.