I would like to have the T10 for a day or two to do the 6DJ8 compatibility upgrade.
After it is done, 6DJ8, 6N1P, and 6CG7 tubes can be used interchangeably with no adjustments. Use in pairs only.
Regarding other upgrades from the T8 to the T10, the T10 has better power supply regulation and lower noise, a more sophisticated ground plane layout with separate sections for audio, high voltage, and low voltage so there are no charge currents at all in the audio ground plane.
It also has a better headphone buffer and it uses all very high quality polypropylene capacitors in the signal path.
And, of course, being a RB (real basic) design functionally, it has fewer contacts and controls in the signal path. It also accepts our new Vision adjustable phono preamp section directly on the mother board with separate power supplies for this section too, with isolated seperate ground planes for the phono section audio and power supply as well.
Frank