Thanks for the help. Yes, I'll have to find some kind of amplifier to stand in while I wait to get the Gryphon repaired. I did this years ago when something else went wrong and the Class D amplifier I bought did not defeat the Colosseum. I guess there is no surprise there.
The only reason I have the Colosseum is that it has a vertical footprint that fits into a rather cramped space. Now, Gryphon has gone away from vertical designs, so, I don't see any replacement in their current amp lineup.
Speaking of tube amplifiers, I thought about trying the Cary CAD-120-S Mk II with its XLR inputs but I have no place to put it and I just know my wife will kick a tube if it is left on the floor, so, I'd better stick to solid state designs, lol.
My friends at Soundsmith got back to me and said they're working through a backlog of repairs. I'll have to figure out when I can strap the Gryphon in the backseat of my car and make the long journey out there.