CJ's don't roll like many others. Stick with factory suggestions. GE 5751's, maybe NOS US made 12ax7's. Call CJ to see what they suggest...
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thank you all for your response. i talked to C/J today, the pv10 came with a german tube, they are now pushing the ecc82 and the 6189 which is a phillips tube. i got that one, but the switch is on or away from the regular tubes they use to sell. just fyi, that still dont answer my question on the other tubes that are available that might work better.
i have owned the following tube preamps:
cj pv 5, pv8, premier 2 and premier 3.
i have found that the circuit design of these preamps is not very tube sensitive.
if you contact customer service, he will probably suggest that while tube rolling may alter the sound, its affect is small.
if you are already experiencing detail, how are you lacking focus. both detial and focus are highly correlated with each other.
my room is damped and therefore nit ispossible that changes in high frequencies brought about by chaningibg the tubes in my various cj amps were not as noticeable as in a very live room.
i have noticed the damping to affect the sound of other tweaks and even reduce differences between the sound of preamps anad amps, but not eliminate them. i can still hear differences in texture of hifg frequencies betweeen ss amps and tube amps, its just that some of the resolution in the treble may be attenuated as a result of the room treatment i use,
i think it is only fair to reveal this relevant material.
by all means try different tubes and see what you hear.
i hope this helps.