Tube Amp Archive

Here's one of my attempts at a finish. The kit was unplayable junk from B.Y.O.G. The sealer wouldn't let the top take any stain, so I used a black saddle makers dye & bursted the edges in black. Looks can be deceiving. This thing was crap every step of the way. Ended up scrapping it. But it looked n...

A couple of people are raving about them on the Gear Page, I swiped a gut shot for your viewing pleasure. Construction appears to be second to none... NOT

http://i30.photobucket.com/albums/c334/ ... uts006.jpg

Hope the pic opens.

I was thinking OT problems too, but it checked out good. It turned out to be the flyback diodes, they were shorted closed. There's my hum and dimming pilot lamp. A short to ground. I read of a similar problem on another forum, with the same model amp. So off to RadioShack this morning and a couple o...

This may sound stupid, but when I unplug the red wire from the board to the output transformer, the hum is gone. OK, no output, no hum. But so is the power drain that was causing the pilot light to dim. My question now is, how can I check an output transformer for shorts with a multimeter? Am I goin...

Please help me solve this...Crate Turbovalve 60 hums loudly, and dims pilot lamp as soon as standby switch is flipped. It does this with or without tubes in it. Two caps on the main board were swelled (450v 47uf) I replaced these, no difference. What next?

Thanks for the replies, it turned out to be the leaking 22uf 500v capacitors. I was going to change them all, but all I could find locally was two of them. And I had two leaking... So I accepted my good fortune and put them in. It worked. This amp idles as quiet as can be. Hum is gone completely. Re...

Thanks Bob, I have two caps that look like they might be leaking, there's a funky residue at the + side lead coming out of the 22uf caps. C35 & C36. Seems like a good place to start. I've never seen a leaking cap before, so I'm not sure what I'm seeing, but it's only on the two. Not the others.

Hi all, I have a 2004 HR Deluxe that hums loudly after being switched on. The hum comes thru the speaker, with or without a guitar plugged in. The hum is constant, with volume on zero or full. Amp hums even without pre amp tubes in it. Changed out all tubes to no avail. Tried two known good sets of ...