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12SN7GT Raytheon used/good 1949 (6.2/6.2ma)
(!!!!) (Best Single #1) 12BH7A Sylvania gray pinched plates "O" getter NOS 1960's (9.4/9.2ma) (Same Gm) 1-2% section balance
(!!!) (Single) 12BH7A CBS Oval Black Plates "O" getter used/good 1960 (7.3/9.6ma)
(!!!!) (Single) 6CG7 Tungsol NOS 1960 era black shield between plates - pin #3 slightly shorter (8.6ma/10ma)
(!!!) (Best Single) 7025 Sylvania NOS 1970's (Gm=2200/2300 and 1.4/1.5ma)
(!!) 12AX7 Sylvania branded Philco NOS 1965 (Gm=2400/2400 and 1.6/1.5ma) 1-3% section balance
(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=2100/2300 and 1.7/1.9ma)
(!!!!) (Best Pair #3) 5670W GE NOS 1986 (7.8/8.8ma and 7.6/8.2ma) 1-5% matched
(READ REVIEW) 6SN7GTB GE NOS 1966-1968 (7.4/6.2ma and 7.6/6.8ma) (same Gm)
(!!!) (Best Single) 6FQ7 RCA clear top NOS 1966 (7.2/8.2ma) (STAX, MARANTZ, CONRAD JOHNSON)
6J5 GE metal can NOS 1961 (10.2ma)
EBF89=6DC8 Valvo Holland used/good 1956 (7.5ma)
(!!) (Best Single) EC92=6AB4 Siemens Halske Germany NOS 1971 (10.2ma)
(!!!!) (Recommended Single) 12AT7WA Mullard NOS wide ribbed plates like CV4024 Mullard 1978 (7.0/7.8ma)
(!!!) (Single) 12AU7=ECC82 Telefunken Germany <> bottom smooth plates NOS 1968 (14.5ma/8.6ma)
(!!!!) (Good Value Single) 6SN7GTB Westinghouse USA black plates "D" getter halo like new 1960 (6.8/7ma)
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)
