Tube Amp Archive

Oups you're right! There are already unmatched resistors at the PI.

Just took them off and connected the cathodes at the ground! I let you know if I'll find any difference at the sound.
Just finished the rebias of the output tubes.... thanks Martin!

Hey, I'm sure that someone can help on this!

There's a Sound City 50+ on my workbench that I'm restoring it. After all the appropriate work to bring it back in life the amp is ready for rebiasing and new output tubes. While I was ready to add the 1R resistors at each cathode and measure the currents I realized that there were allready one resi...

Nice thread! Didn't know all these stories with caps...

I'm using F&T all the time and BC for the small axials. I don't find them expensive...

rhinson, can you scan it and post it here?!

ToneMerc wrote: If it was me I would run a pair of KT88's with about 475-490V on the plates. I would run the the KT66 at least 455-470.

Maybe you're right but I'd like to try KT66. They're great tubes!
I'm planning to run them at 480V. I don't think it's too high for these tubes.

Jana wrote: I guess that eliminates me from this thread.

Oups!

Jana wrote: Personally I try for about 400 to 430 volts B+.

Can you be more clear on this? Why not higher?

Hello everybody! First post here! Please be kind with me! :) I'm planning to build a new guitar amplifier and I'm thinking to go with KT66s. I need a clean with a lot of headroom sound! I have put some KT66s in Fender clones and the results were more than pleased! But I believe, these tubes need the...