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(!!!!!) (Best Overall Pair) JAN-6384 Tungsol low hours/test like new 1967-1972 (68.5ma and 66ma)
(!!!!!) (Best Value Pair) 45 RCA/Cunningham engraved base used/75% (22.4ma and 23.8ma) (Close Gm) (Excellent sonics in SET amp)
(!!!!!) (Best Value Pair) 45 Tungsol used/very good similar build different top mica 1930's - 1940's (27ma and 25ma) (sound great - one of my favorites)
(!!!!!) (Best Value Single) 45 Sylvania green leaf NOS 1940's production stains on glass (37.2ma) (Highest mA and Gm)
(!!!!!) (Good Value Single) 45 Sylvania branded RCA NOS 1952 production stains on glass (31.6ma)
(!!!!) (Best Overall) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (113ma/119ma) (close triode section balance)
(!!!!) (Best Pair #1) 5881 Tungsol NOS 1954 original boxes (72 and 73ma) (rare)
(!!!!) (Best Pair #1) 5881 Tungsol rebranded Sylvania and GE 1960 era used/test like new (77.3ma and 74.5ma) (close Gm)
(!!!!) (Best Pair #2) 5881 Tungsol branded RCA used/good 1963 (64ma and 65ma)
(!!!!) (Best Pair #2) 5881 Tungsol NOS 1954 original boxes (68ma and 69.5ma)
(!!!!) (Best Pair #3) 5881 Tungsol used/good 1960's (63.2ma and 66ma)
(!!!!) (BEST PAIR) 2A3 Ken Rad branded GE coated glass NOS 1949-1950 (110ma and 103ma) (close Gm) (sound fantastic)
(!!!!) (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 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)
(!!!!) (microphonic single) 5687 Tungsol ribbed black plates "U" getter NOS 1952 (42/41.5ma) (1st series made)
