Today I'm posting some early Calypso tube rolling results. I tried a pair of Ei 12ax7's but the ones I have just didn't really sound that quiet although they are better than the stock tubes which are a pair of Teslovaks. Next I swapped in Tesla ECC803S. Much, much quieter than both the Ei's and Teslovaks. I have to stick my ear up to the speakers to hear any noise Very good dynamics and decent imaging. A nice improvement but not much different than the Ei, just quieter. Then came a pair of Tung-Sol 12ax7. Just as quiet as the Tesla but the details, dynamics and image resolution are a real big improvement over all of the tubes I've tried so far. The soundstage is deeper with the Tung-Sol. I could be happy with this tube. This combination of the Rhea and Calypso is quieter than with the BAT VK50SE with just changing two tubes. This tube may be a real good candidate for the V1, V2 positions in the Rhea. Still waiting the arrival of the Tele's and Amperex I bought the other day.
As for the 6922, I am trying a Tesla PCC88 but it is too soon to give a decision on them.
As for the 6922, I am trying a Tesla PCC88 but it is too soon to give a decision on them.