@stringreen +1 Within the last year I sent my Steve McCormack modified DNA-1 back to him for a 20th anniversary upgrade. Steve and the guys at SMc Audio really did an extensive refit on the amp. Steve explained that he has had some deep pocket customers asking him to build them ne-plus ultra amps with absolutely first rate parts and circuit layout schemes. He has taken much of what he learned from those experiences and trickled it down to his more monetarily modest upgrades.
As @stringreen mentioned, much of the improvements have been in improved parts quality. I hope to listen to my current amp till time ends my listening altogether.
As @stringreen mentioned, much of the improvements have been in improved parts quality. I hope to listen to my current amp till time ends my listening altogether.