A short follow up to my limited tube rolling exercise.
The GE 6GH8A tubes made an improvement IMO. Certainly worth a try since a guy on epay still has some nice NOS stock for peanuts.
Also, it seems that the Mullard reissue rectifier is a good fit for me.
So... a follow up to the follow up.
I can't stand it, I still brag on the awesome little Ultravalve. I continue to be amazed with the smooth highs and great bass extension. It sounds like a hybrid amp.
Anyway, I added a matched quartet of reissue Genelex KT-77's and they sound crazy good after some hours logged. I'd love to have a set of those renown blue bottle EL-34's, but I couldn't pull the $500 trigger. I'm content with the KT-77's and have no desire to screw with anything. I don't even want to turn a screw to see what lurks in that shiny chassis. I could make it sound different, but not better.
Mr. Frank steered me perfectly when I asked about what to do with powering the big Bozaks. I'll be trying it with another system that uses more efficient speakers. Regardless of that outcome, the Ultravalve is staying with the Bozaks. The worst that could happen is that I'll be forced
to buy another one.