Hi Jim,
Yup, you’re right. The new schematic has the correct list of compatible tubes on it.
For the new Modern Line Phono, the initial testing is showing that 5 mVrms (Typical of a modern moving magnet cartridge) input at 1khz = 1.02 Vrms. Where the classic line versions output was 0.989 Vrms. So not a big difference. However, if you need more output then you can use some higher gain versions of the 6SL7 such as the later version #279 & #280 Sylvania / Philips 6SL7WGT tubes. I believe the output from those is ~1.2 Vrms and they are very great sounding tubes.
Cheers,
Charles