I have an HCA 2200 and I love it. I do not know which version, though it does not say on the front that it is a mkii, so I assume it is a mki. It does have two toroidal transformers. I don’t recall if it has separate power supplies.
I read that Mr. Curl recommends disabling two banks of small capacitors. I may take it to a local hifi shop and see if they are willing to perform said surgery. Kind of like tube rolling your solid state gear
Btw I bought mine on ebay about the time of the original post for $340. I think it was a bargain. No problems to date except a couple of screws that needed tightening. I pair it with a tube preamp (Aric Audio Transcend) and drive Magnepan 1.7i’s with it. Very happy.