(!!!!) (Best Pair) 5670W GE NOS 1986 (8.8/9.4ma and 8.8/9.6ma) 1-3% matched
(!!!!) (Recommended Pair) 5670W GE NOS 1986 (7.6/9.0ma and 8.0/9.4ma) 1-3% matched
(!!!!) (Recommended Pair) 5670W GE NOS 1986 (9.0/9.2ma and 8.4/8.8ma) 1-3% matched
(!!!) (Best Pair) 6AH6WA GE NOS 1980's (10.5/10.3ma)
(!!!) (Best Pair) 6AH6WA GE NOS 1980's (10.6/11ma)
(!!!) (Best Single) 6U8A GE Motorola NOS 1977 (15.2ma/9ma)
(!!!) (Best Single) 6U8A GE NOS 1961 (17ma/9.6ma)
(!!) (BEST PAIR) 6CB6A RCA "D" getter NOS around 1960 (9.0ma and 9.2ma)
(!!) (Best Pair) 6EA8 Sylvania branded Zenith NOS 1962
(!!) (PAIR) 6CB6A RCA NOS (8.2ma and 8.5ma)
(!!) (PAIR) 6CB6A RCA NOS 1960's - 1970's (7ma and 7ma)
(!!) (Recommended Single) 6U8A GE NOS 1977 (14.2ma/10ma)
(!) (Best RCA Pair) 6SG7 RCA metal can NOS 1961 (10.0/10.4ma)
(!) (Best RCA Pair) 6SG7 RCA metal can NOS 1961 (11.6/12.4ma)
(!) (PAIR) 6JT8=6KR8 Raytheon Japan NOS (10 Pairs)
(!) (Recommended Pair) 5651 Sylvania NOS 1960's (1 pair)
(!) (Recommended Pair) 5651 Sylvania NOS 1970 era (1 pair)
(!) (Recommended Pair) 6AH6WA GE NOS 1980's (10/10.6ma)
(!) (Recommended Pair) 6AH6WA GE NOS 1980's (8.3/8.6ma) (Same Gm)