VAC 70/70 III Owners......6SN7, 300B Recomm.

My favorite 6SN7 combination, in my vac 70/70 mk3:

in this order:
--black glass KenRad, vt231 (6SN7GT): big deep sound, without sacrificing air
--black glass National Union vt231: very similar to above, maybe a bit softer, darker
--TungSol black glass, round getter: great tube, balanced, big sound, but not as big as KenRad; quiet.
--Sylvania VT231: sparkly, extended, but too bright with my speakers (Martin Logans). this might be the best tube with another speaker.
--GE 6SN7 GTA ... this is a great tube, well balanced, no major outstanding fault, and much more reasonably priced than the others (but also, lacking some of the magic of the above)
--electroharmonix... OK, kind of sterile, edgy.

300b
--The Golden Dragon's sound good in this amp! but,
--I liked the JJ 300bs even better... these sound GREAT in my amp. great extension, powerful sound. check out Eurotubes on the internet for good prices.
--don't waster your money on Western Electrics in this amp, I've tried them, and honestly, preferred the JJ 300bs. The JJs had better extension. The Western Electrics just didn't seem all that special, so I sold them, got most of my $$ back.

I recently purchased a VAC 70/70 mk3 s. where can I find more information about the tubes diagram for the amp? I know it uses two 6sn7 per channel. Are there any differences in functionality between the two 6sn7 used for each channel? For example, do I need to use a matching pair of 6sn7 per channel?

I have one matched pair of RCA red base 6sn7 and a matched pair of Raytheon vt231 6sn7. Can I use one RCA + one Rayheon vt231 for each channel? Thanks.

   "Can I use one RCA + one Rayheon vt231 for each channel? Thanks."      Yes and that's preferable, compared to using the exact same tube, in both positions.  

@rodman99999  Thanks. Do you know which sockets are which (splitter, driver) in the 4 sockets from left to right? Can't find that info in the manual. Thanks.