@mark200mph congrats on the M-1000 amps. That is great they are still purring :) but I’m not surprised they still play to a high level. Accuphase engineering approach sets a very high bar and they build them to last 30-40 years give or take. There are interesting Accuphase factory visit vids on YouTube , and in some of these, they include the original technicians and engineers who worked even more vintage gear- and still support repairs. They had a customer with a 50 year old component and they repaired it and sent it back. I love this, and love their overall company ethos. I wish I had gotten into Accuphase years ago but happy to finally have gotten over the what ifs that kept me away. Life is short :)
Have you played around with the Accuphase room correction component?
cheers

