It does not use those tubes; only 6350 and 6em7s (at least in the 150MKIIs) - I don't think there is any ground to be gained by using anything but Jud's NOS stash - GE's I think.
Well if those are tubes you need for phono, I really like the Amperex 6dj8 A-Frames which are still relatively cheap - but will they be quiet enough. For 12axs7s I would get RAM Labs Yugo Ei's that are pre-war versions and will be VERY quiet in a phono stage. Roger charges alot for tubes and service, but you get what you pay for.
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