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(!!!!) (BEST PAIR) 309A Western Electric NOS 1960 (4.8ma and 5.1ma) (same Gm)
(!!!!) (Best Pair) 311B Amperex made in Russia NOS 1977 (34.2ma and 34.5ma) (very good construction)
(!!!!) (BEST PAIR) 408A Western Electric NOS "D" getter 1970 (85/60 and 86/60)
(!!!!) (BEST PAIR) 408A Western Electric NOS 1976 and 1982 (86/60 and 88/60)
(!!!!) (BEST PAIR) 417A Western Electric NOS 1980 (42.5ma and 44ma)
(!!!!) (Best Pair) 5751 RCA black plates NOS 1976 (2.5/3.1ma and 2.5/2.8ma) (Best Audio Grade 5751)
(!!!!) (BEST PAIR) 5842=417A Western Electric NOS 1980 (39ma and 40ma)
(!!!!) (Best Pair) 5842Q Raytheon NOS 1983 (27ma and 29.5ma)
(!!!!) (Best Pair) 5842Q Raytheon NOS 1983 (35ma and 37ma)
(!!!!) (Best Pair) 5881 GE Canada NOS 1965-1970 (73ma and 73.5ma) (same internal build and sonics as 5881 Tungsol)
(!!!!) (Best Pair) 5Y3GT Philips Holland NOS 1960's (60-64/40 and 60-65/40)
(!!!!) (BEST PAIR) 6201=12AT7WC GE "5 STAR" NOS double mica, copper grid posts, gray plates, 1972 (10.8/12ma and 11.2/11.0ma)
(!!!!) (Best Pair) 6BL7GT GE "D" getter NOS 1957 same build (34/36ma and 37/32ma)
(!!!!) (BEST PAIR) 6BL7GTA GE branded RCA/Raytheon"D" getter halo NOS 1950's (37.0/38.2ma and 35.5/42.2ma) (close Gm matching)
(!!!!) (BEST PAIR) 6BL7GTA GE branded Tungsol "D" getter halo NOS 1950's (36.6/37ma and 39/37ma) (close Gm matching)
(!!!!) (Best Pair) 6BQ7A RCA black plates NOS 1967 same date codes (15/14.5ma and 13.5/16.5ma)
(!!!!) (BEST PAIR) 6C4WA GE JAN NOS 1973-1980 (8.4/8.2ma)
(!!!!) (Best Pair) 6CA4 RFT East Germany (Funkwerk) NOS 1970's (49/40 and 50/40 x 2 tubes) 1% matched
(!!!!) (BEST Pair) 6CW4 GE NOS 1966-1970 (117/60 and 118/60) (strong emission)
(!!!!) (BEST Pair) 6CW4 GE NOS 1975-1976 (120/60 and 120/60) (strong emission)
