It is an excellent design. Upgrading the coupling capacitors, feedback loop capacitors and the resistors (plate, cathode, grid stopper and feedback) brings them up to the level of anything you can buy today in that poower range.
Luxman 3045 mb
I have these wonderful Tim deParavincini designed amps from I believe the early 70's. Anyone out there have experience with upgrading, moding, servicing. I switched to KT 88 output tubes 10 years ago.