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7N7 Sylvania branded RCA chrome top used/good 1956 (6.6/8.4ma)
(Read Review) 26 Sylvania branded Westinghouse NOS 1946
(!!!!) (Single) 12BH7A GE gray oval plates NOS mid-1960's (11.5/16ma)
(!!!!) (Best Single) JAN-5687WA Sylvania NOS 1967 (38/39ma) (Highest Ma and Gm)
(!!!!) (Best Pair #2) 6U8A Philips by Sylvania NOS 1986 (20.5/8.2ma and 20.0/8.0ma)
(!!!!) (BEST Pair) 6CW4 GE NOS 1966-1970 (117/60 and 118/60) (strong emission)
(!!!) (Best Pair #2) 6CW4 RCA NOS 1963-1968 (112/60 and 108/60)
(!) (Recommended Pair) 6AH6WA GE NOS 1983 (9.0/9.4ma)
40 NOS
401A Western Electric
407A LM Ericsson Sweden like new 1960's (41/26 and 42/26)
407A LM Ericsson Sweden used/good 1960's
407A Sylvania branded RCA gold pins used/good 1971
407A Sylvania branded RCA NOS 1977
407A Sylvania gold pins used/good 1960's
407A Western Electric like new 1968 in white box (54/26 and 64/26)
(!!) (Best Overall Single) 407A Western Electric NOS 1963 (53/26 and 53/26) 1-2% section balance
(!) (Best Single) 407A Western Electric NOS 1962 (44/26 and 49/26)
407A Westinghouse Canada NOS 1960's
(1 PAIR) 408A Western Electric used/good 1964 (79/60 and 78/60)
