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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: What tubes to use with this Interstage Transformers?

"Fc is shifted due to the R being smaller."

Correct but with a low enough Rp (and it not being multiplied by a step up IT) Fc is high enough so it no longer matters.

"Essentially, your choice is not to use the 1:4IT which I understand and respect that.

But my choice is to use the IT I have and to work around it and find a suitable tubes for it. I think you have mentioned that it would be very difficult if not next to impossible? "

Yes, and I will say it again.

If you had a driver stage with (let's say) a 500 ohm output impedance, that 500 ohms would look like 8k ohms to the output tube's grid and Miller C. As long as the output does not have too much Miller C then the 8k ohms would drive it just fine. That is to say the Fc would be high enough as to not matter.


Tre'

Have Fun and Enjoy the Music
"Still Working the Problem"


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