I know very little about electronic design, but I remember Chris Russel of Bryston stressing that same point about the power supply way back in the early 90’s. I think they were one of the first companies to use outboard power supplies for their pre-amps too.
Now I’m curious enough about Bob’s enthusiasm for this little headphone amp to buy one myself! I’ll have to find someone locally to do the mod for me though…LOL
