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(!!!!!) (Best Overall Pair) JAN-6384 Tungsol low hours/test like new 1967-1972 (68.5ma and 66ma)
(!!!!!) (Best Single) 45 Raytheon NOS 1940's (38ma) (Highest Ma and Gm)
(!!!!!) (Single) 45 RCA/Cunningham engraved base used/65-70% (19ma)
(!!!!) (Best Overall Single) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (113ma/119ma) (close triode section balance)
(!!!!) (Best Pair #1) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (94ma/100ma and 93/87ma) (close Gm matching)
(!!!!) (Best Pair #3) 5881 Tungsol used/good 1960's (63.2ma and 66ma)
(!!!!) (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 Single #2) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (117ma/141ma) (close Gm balance)
(!!!!) (Best Single) 6550 Tungsol branded RCA NOS vented plate NOS 1965 (130ma) (Recommended for Audio Research Ref power supply)
(!!!!) (BEST SINGLE) JAN-CHY-5U4G CBS NOS 1957 (58/40 and 60/40)
(!!!!) (Best Tungsol Single) 6V6GT Tungsol gray plate/coated glass NOS 1945 era - some surface oxidation on metal can (45.5ma)
(!!!!) (Best Value Pair) 5881 GE Canada NOS 1965-1970 (73ma) (same internal build and sonics as 5881 Tungsol)
(!!!!) (BEST VALUE SINGLE) 5U4G TUNGSOL NOS 1952 slightly tilted glass (52/40 and 52/40)
(!!!!) (Best Value Single) 6550 Tungsol branded Sylvania smooth gray plate used/tests like new 1960 era (138ma)
(!!!!) (Best Value) 5U4G GE NOS 1952 in white box glass slightly tilted (48/40 and 49/40)
(!!!!) (Good Value Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched - slightly faded top getters (54-55/40 x 2 tubes)
(!!!!) (PAIR) 5V4GA RCA NOS gray plates 1967-1971 slightly tilted glass (60-60/40 and 59-59/40)
(!!!!) (Single) 12AY7 GE branded Raytheon black box plates "D" getter 1953 era in white box (3.3/3.1ma) (Same Gm)
(!!!!) (Single) 6CG7 Tungsol NOS 1960 era black shield between plates - pin #3 slightly shorter (8.6ma/10ma)
