Wonder what it will cost to retube with high quality NOS tubes?
The eight 6N6p are still cheap, ~ $20 a tube, and the input pair can use a plethora of available new 61Np (also ~ $20 each) and new or vintage 6922 / 6DJ8. There are no rolling options for the 6N6p. So retube will cost $160 plus however much you want to drop on a nice pair of 6922 (which should last an extremely long time anyways).
Seems like a good choice of tubes for the job.