Modwright PH 9.0X Tube Rolling Question

I did. Was my favorite tube amp ever, but I have since gone solid state. I used both Reflektor 6C45 and Reflektor 6H23p to replace all four tubes. Huge difference althroughout. The Amperex white globes are quite incredible, too, but cost around $300/pair. 

6C45 is a single section triode. How did you manage to use them as a sub for 6922, a dual triode? Not to mention that the two types are electronically quite different even if you could mount two 6C45s to replace one 6922.

I own this and love it. Yes the 6C45 cannot be replaced with the 6922 to my knowledge so not sure what blisshifi is referring to. I replaced my 6922 with Siemens E188CC/7308's and the result is extreme clarity, dynamics and transparency. The instruments have more air and separation and the soundstage is rich and full. IMO tube rolling is system dependent and while I have a few different tubes to choose from I'm sticking with the Siemens for now.