Tube Amp Archive

I really like the idea of texturing the clean sound with an overdrive channel as opposed to changing the foundation of the tone altogether. Kinda like the idea behind a dumble. That's a great question about the NFB. I was planning on running it back to both PIs but that might have interesting phase ...

Thanks Jana... that would have been frustrating to try to figure out why they still weren't in phase. That makes sense though that it's not inverting... oops.

Thanks for all your quick replies! My design goal is to end up with a flexible amp that can act as a channel switcher or for added texture have the 2 channels on at once. I really dig the idea of mixing channels ala the Komet Connie but in one of the channels the PI breaking up is a big part of the ...

I was thinking of using 220k mixing resistors into a coupling cap. Here's the design: Channel A has 3 gain stages into its own LTPI Channel B has 2 gain stages into its own LTPI The outputs of the PI are mixed and then sent to the output tubes I'm wondering if it would work to do the following (so t...

If I've got 2 channels that are out of phase with each other and I wanted to mix them post phase inverter (each channel has it's own inverter), would it be sufficient to ensure that output tube "A" is driven by the mixed signal consisting of the left PI plate from channel A and the right PI plate fr...

So do you expect that the one channel with the LTP would overpower the cathodyne channel? The cathodyne channel will have significantly more preamp gain than the LTP channel. Any thoughts?

Both preamp channels have the same number of stages and will be in phase. How drastic will the phase difference be from the phase inverter? I was thinking of going PI -> Post PI Master (dual 1M pot) -> mixer -> grid resistors. How bad would the channel leakage be? Also, what do you mean by having to...

Is it possible to mix 2 channels post phase inverter and then share the same output tubes? IE to take the output of 2 phase inverters (a LTP and a cathodyne) and mix it (via 220k resistors) before sending that to the tubes? Would you need a coupling cap between the output of the mixer and the power ...