THIS JUST IN!
ironbut reports that he has resurrected Satan's Demonic Sauce! Steve has had the amp for a couple weeks and after reading all of the comments in this thread and testing parts and replacing some parts and doing some kind of deal with the devil, the amp is back to form as of this evening. I am thrilled and hopeful that we can keep it that way for awhile. Thanks so much for the help of KG and the rest of those who posted here. I may yet have a new PS built at some point along the lines Kevin proposed but for now I will just cross my fingers and listen to it.
Most thanks go to Steve, of course, and I really owe him for his efforts (in more ways than one!) Maybe there is hope for some of the others out there struggling...
In honor of the passing of the great Walter Cronkite, I will borrow his sign-off:
And that's the way it is.