(!!!!!) (2nd Best Pair) 6SN7GTB GE NOS 1964 (7.2/7.2ma and 7.0/7.2ma) (Schiit Freya, Rogue) 1-3% matched
(!!!!!) (Best Overall Pair) 6SN7GTB RCA NOS 1968 same date codes (8.2/8.8ma and 9.0/9.6ma)
(!!!) (Recommended Pair) 12BZ7 National Union branded Admiral and Sylvania "U" getter NOS 1960-1961 era (1.6/1.6ma and 1.7/1.8ma)
(!!!) (Recommended Pair) 12BZ7 RCA NOS 1964 and 1968 (1.8/1.8ma and 1.8/1.9ma)
(!!!) (Recommended Pair) 12BZ7 RCA NOS 1969 (1.6/2.1ma and 1.8/2.2ma) (High Gm)
(!!!) (Recommended Pair) 1626 RCA NOS 1940's (31.5/32ma)
