Don Sachs Kootenay 120. It is a highly upgraded Bob Latino ST-120 with Dual regulated power supplies and high quality capacitors, resistors, etc. It is rated at 65wpc with KT88’s or 6550. I’m not sure how it might compare to the Mac. but it is as good as I have ever heard. Don is in Canada. FWIW I own this amp now and am not looking to upgrade
The biggest problem is that he is usually backed up for 3-5 months and used units are snatched up very quickly