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(!!) (Recommended Pair) 12B4A GE NOS 1960's - 1970's same build (30ma and 30.5ma)
(!!) (Best Pair) 12BE6 Tungsol NOS 1960 era (2.3ma and 2.5ma)
(!!) (Recommended Pair) 272A Western Electric "meshplate" NOS and low hours/like new 1940's - 1951 (6.3ma and 6.4ma)
(!!) (Recommended Pair) 6AG7Y RCA brown bottom NOS 1958-1964 (27.8ma and 28.8ma)
(!!) (Recommended Pair) 6AG7 RCA NOS 1960's same date codes (27.5ma and 29.2ma)
(!!) (Recommended Pair) 6HA5=6HM5=EC900 Amperex Holland "Globe Logo" NOS in white boxes 1971-1972 (17ma and 18ma) (Highest mA and Gm)
(!!) (Recommended Pair) 6J6A Tungsol NOS "D" getter 1961 (7.5/8.8ma and 7.8/9.2ma)
(!!) (Recommended Pair) 6KZ8 Sylvania branded Raytheon NOS
(!!) (Best Pair) ECC40 Philips NOS made by La Radiotechnique, Chartres/France 1969 (6.8/6.3ma and 6.8/6.4ma) 1-3% matched
(!!!!) (Best Pair) JAN-5842WA Raytheon NOS 1984-1985 original boxes (24ma and 23ma) 1-3% matched
(!!) (Recommended Single 1961) JLRV-12AT7WA=6201 GE Canada gray plates triple mica "U" getter NOS 1961 (9/12ma)
(!!) (Best Value Single) JAN-5670W GE NOS 1986 (10/7.5ma)
(!!) (Recommended Single) 311B Western Electric NOS 1967 glass slightly tilted, large getter, in white box (33ma)
(!!) (Recommended Single) 6350 RCA NOS rebranded United triple mica "U" getter halo 1950's (9/9.6ma)
(!!) (Recommended Single) 6350 Sylvania black plate NOS "U" getter halo 1957 (9/10ma)
(!!) (Recommended Single) 6AK5 Tungsol gray plate NOS 1956 (8.3ma)
(!!) (Recommended Single) 6U8A GE NOS 1977 (14.2ma/10ma)
(!!) EC92 Siemens Halske NOS rebranded Philips Miniwatt 1968 "O" getter halo (6.8ma)
(!!!) (Recommended Single) EC92=6AB4 Siemens Halske NOS 1967 (9.2ma)
(!!) (Single) GB-6SL7WGT Sylvania Gold Brand brown base round black plates "O" getter NOS 1950's (1.7/1.7ma) 1% section balance
