One of these days I will get to hear a fully taken-care of XK-S7000

Thanks for your response, and bringing it here too. I need to take some time with my Techie M85. I'm not getting what I believe it can do out of it. While it works OK, it's veiled vs my other decks, And more specifically the speed is a bit fluttery. I'd imagine this is where sorting the flywheel comes in, and replacing the caps
It's difficult to compare decks - the decks I've experienced so far are different to those you have and I suspect that the Revox B215 and Studer A710 don't necessarily compare. Just as the Nak ZX-7 and Cassette Deck 1 may not... until we manage to get a bunch of decent deck in the same room it'll remain a matter for subjectivity and personal experience

it won't stop us seeking audio nirvana though will it?
Cheers!