• 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.

Tube buffer with 6n1p-EV

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Build the one suggested in post #2.

The one shown in post #6 is a mess.

For the #2 one, you can get the +/-30V or thereabouts (it's not that critical, higher is better) from your power amp ... which of course I guess is not a Tube one.

By the way, I have commercially sold such tube buffers , under the brand name "Valvulizer" (tm) for those who insist on having some orange glow in their amps ... but I consider them a scam (yes, my own too). :(
 
I can answer that one: raise cathode resistors, R3 and R31 to 15K or 22K.
As I said earlier, the higher the voltage the better.
I used rails between +/-42V and +/-70V for what basically is the same circuit.

That tube (or most others) will be *really* happy with 160V (total) voltage or higher, so any step you take in that direction is fine.