The 6CA7s sound great in the ST-70 and I'm very happy with the EL34IIs in the CMII in their respective systems, but I definitely plan to swap them to see how each tube type sounds in the other system. I look forward to hearing your impressions. I note that I have efficient and easy load speakers in both systems, so your Thiels likely response a bit differently?
I do not like the JJ 12AU7 in either my CMII or my Rogue RP-5 preamp, but I'm very happy with these power tubes and a big fan of JJ now. Not being Russian is a good start, lol, but they're really nice sounding too. Now I'm thinking of trying their KT88, KT77 or KT66 at some point soonish as well.
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