Tube rolling in Hagerman Trumpet MC

I have been doing some tube rolling in the Trumpet MC and am trying to be a sure as I can that I don't substitute a tube that could cause a problem.

It looks like from my very poor reading of the schematics that the V1 12ax7's are for initial gain pre RIAA, the second pair V2 are phase splitter post RIAA, and the 12au7's V3 are driver/output/cathode follower (not sure about that last one as the circuit doe not look like a typical cathode follower circuit and even looks like anode follower?).  Any enlightenment here would be helpful.  This is because even tubes that are considered "drop in" substitutes are not actually identical on the manufacturer spec sheets.  For instance the 5418 has a slightly higher heater current than and au7 and there might be another parameter that is different (Vhk?).  Even the 7316 is slightly different.  And of course the 5751 has lower gain than a ax7 as well as other differences.  Many of the differences are still within spec, and given what I can see from the online schematic of the Trumpet MC, look like no problem, but I just want to make sure.  I have emailed Jim Hagerman and he has been helpful when I have, but I hate to keep bugging him with my questions, so I will bug you guys instead.

Thanks for you help and the bandwidth.