Nuvista Tubes - General

George, please correct me if I am misquoting you - in which case the circuit is no longer pure tube, but hybrid.

Correct, as I was letting the OP know that the final sound signature of it was solid state and not tube.
If it didn’t have the solid state buffer, the sound would be very different and not be able to drive very well either due to high impedance, that why Anthony Michaelson (MF) put the solid state output buffer in it.

Here is a pic of the output section.
https://ibb.co/nvT2sR

Cheers George

I also don’t really see DC coupling as a benefit in an amp

That's your opinion, listen to a good direct coupled amp, say Gryphon/Krell ect, then listen to it with the best cap or transformer you can get inserted somewhere in the signal path.

For the most transparent sound, the best cap is no cap, and the best transformer is no transformer.

Cheers George

George, we will agree to disagree on cap coupling.

That’s why there’s so much rolling goes on with caps as they all have their own coloured sound, the best cap is no cap for the ultimate transparency..

DC management circuitry involved makes it a bit more than no cap.

It's a know fact, that DC servos are much more transparent than cap coupling.


Cheers George