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(!!!!!) (Single) 12BH7 Super Radiotron Australia gray ribbed plates NOS 1960's (9.8/14.2ma) (similar sound to RCA) (McIntosh, VTL, Manley, Quicksilver)
(!!!!) (Best Overall) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (113ma/119ma) (close triode section balance)
(!!!!) (Best Pair #2) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (84ma/104ma and 91ma/95ma) (close Gm balance)
(!!!!) (Best Pair) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (94ma/91ma and 92ma/103ma) (close Gm balance)
(!!!!) (Best Single #2) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (117ma/141ma) (close Gm balance)
(!!!!) (Best Single #2) JAN-5998 Tungsol NOS black plates NOS 1966 same build as 421A Western Electric (94ma/100ma) (close triode section balance)
(!!!!) (Good Value Pair) 6SN7GTA GE NOS "U" getter halo - side getter - copper grid posts 1953 (6.0/7.2ma and 6.0/7.2ma) 1-2% matched
(!!!!) (Good Value Single) 6SN7GTA GE "U" getter halo used/good 1952 (9.4/11.4ma)
(!!!!) (Good Value Single) 6SN7GTA GE "U" getter halo used/good 1954 (6.0/6.4ma)
(!!!!) (microphonic single) 5687 Tungsol ribbed black plates "U" getter NOS 1952 (42/41.5ma) (1st series made)
(!!!!) (microphonic singles) JAN-5687WB Tungsol branded Raytheon black plates "U" getter NOS 1950's (3 in stock)
(!!!!) (Single 1950's) 12BH7A RCA branded Westinghouse narrow black plates NOS "U" getter mid-1950's (10.6/7.4ma) (1st series made)
(!!!!) (Single) 12BH7 Sylvania Philco black oval plates "D" getter used/good 1953 (9.8/9.5ma) (Same Gm)
(!!!!) (Single) 12BH7A GE gray oval plates 1962 (6.6/9.6ma)
(!!!!) (Single) 12BH7A Sylvania gray oval plates "O" getter NOS 1960 era (10.4/7.6ma)
(!!!!) (Single) 12BH7A Sylvania Silvertone gray oval plates large "O" getter halo 1960 era NOS (11.5/10.6ma)
(!!!) (Best Single 1953) 12AX7 GE gray ribbed plates "D" getter 1953 like new (Gm=1600/1600 and 1.1/1.0ma) (1st version)
(!!!) (Best Single 1957) 12BH7A GE NOS gray oval plates large "U" getter halo 1957 (12.5/11.0ma)
(!!!) (Best Single) CK5687WA Raytheon black plates "O" getter like new 1960 (35/38ma)
(!!!) (BEST VALUE PAIR) 5881 Tungsol tests like new 1957 and 1963 with broken center guide pins - see photo (72.5ma and 68.2ma)
