I am the lucky owner of one of the few resurrected Grange pre-amps from Mick (2022): I can't think of a more satisfying and enveloping sound miracle, be it fed by analog or digital. I am using 300B (Takatsugi) tubes at the moment, but will be experimenting with 45 SETs (Sophia Electric) soon.
Mick is a great guy to work with: he made my Grange to my specs and supported me all the way until is was set up properly. Stay well, Mick!