Call or Email Frank at The Parts Connection they have some NOS tube upgrades for thier gear.
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I have the Amperex 7308's in a pre1L and am using telefunken smooth plate 12ax7 and RCA black plate 12au7's in the amp. Sounds better than stock--better midrange, smoother highs. They say the Sovtek 12ax7lps (if I have that right)--their new 12ax7 is a very good tube for the money. The phillips 12au7's aren't that great, so replacing them with just about anything would help some. For the 6922--almost anything with gold pins is worth a try. 7308 tubes are supposed to have matched segments, so matching isn't as critical with those tubes.