WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
Which gives better sound in this buffer?
Of course if you have experience with this buffer X10-D. Which of these two tubes (6n11; 6n23p-EV) is a direct replacement for ecc88?
Thank you for your cooperation!
We fitted a 6N1 into the buffer and the heater voltage dropped to below 5V iirc. This clearly showed that the psu could not supply the higher current needed for this family of tubes. That was the end of the experiment.
I have replaced 6922 with 6N1 in SRPP circuits with great sonic benefits though I have not tried any of the tubes you are considering.
6Н23П-EB (6n23p-ev) IS 6922. That's exactly the case for ElectroHarmonix (EH) branded tubes sold as 6922. A 100% electrical equivalence exists.
How much sonic difference will be present, if any, in a buffer (cathode follower), when the tube is "rolled" is, indeed, a question. Good NOS 6922s are damned expensive. The best sounding current production variant is the "reissue" Genelex E88CC, but that variant carries a 45 USD price tag. FWIW, I say use the tough Russian tube, as it has decent sonics and it will last.