Tube Amp Archive

gary wrote:according to a recent email, he is dealing with a family health/hospital situation at the moment.

All the best to him. I'm sure he'll contact me when things settle down. Thanks for the update.

Has anyone heard from UR12? I've been trying to contact him for two weeks or so and no reply on E-mail. Is he on vacation or something? I'd like to order a Lil Devil kit.

MCK,

Good news for you! Excellent learning experience as well.

FYI, you can find flux remover in some supply houses. Usually acetone will work better than alcohol. Flux can become conductive, especially with high voltage.

Enjoy the amp!

panrixx wrote:So what has actually changed since the first sign of trouble? I've got a bit lost with the parts being disconnected, jumpered and reconnected!

I think that MCK as found that there was a shorting path around C11 because of some "build-up." Could be flux or something that caused a short.

MCK, Bummer about the problems. I'd proceed by trying to isolate the AC from the DC side. I'm not familiar with this amp but perhaps you can disconnect the AC side of the DC supply by removing the fullwave rectifier or the diodes or the transformer wires. If the fuse still blows, It could be the fil...

I'd start by removing the tubes and then seeing if the fuse holds in. You can check your voltages too. If everything seems Kosher, then you can install the tubes one by one to see if any are giving you a problem. Is there a warranty on the tubes? I'm thinking about building one of these and wonder w...