Tube Amp Archive

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HeeBGB, check your email.

I've got a chassis to build one of these if anyone's interested. I'm not going to have the time to build one.

I finally figured this thing out.. It was the attenuator I was using (weber mass)! That explains why my other amps have had the same oscillation. Instead of having sustain and feedback, the amp would go into harsh oscillation. I do know that this amp is LOUD.

Thoughts?

Yeah, very cool. Look forward to seeing the rest. Thanks guys!

I'm not sure that the shielding in my guitar isn't the culprit. I also have a transistor/zerner voltage-dropping network in the PS that I'm a little weary of. The PS is star-grounded at the transistor.

Seems like I've had a similar oscillation in other builds..

I can't pin it down. Are Sovtek 8L84's decent enough? Any other ideas?

Here's a better clip of the problem..

Doug, it's a Heyboer OT. Volume was at about 7.

Yeah, here are some clips.

Hi all. I have this 18w Liverpool build I'm working with that has what sounds like an oscillation or fizz riding the distortion. My layout is good, shielded grids, twisted leads going to the power tube grids etc. Moving wires, changing preamp tubes etc. doesn't change anything. Is this just characte...