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6F8G RCA gray ribbed staggered plates NOS no printing 1950 era (7ma/8ma)
6SL7GT Brimar NOS black base black plates 1950's (2.2/2.4ma) (slightly microphonic)
6SN7WGT Raytheon brown base black ribbed plates "D" getter halo 1959 used/good (6.2/8.4ma)
6V6GT GE black plate "D" getter like new 1958 (47.5ma)
7199 RCA Black Plates NOS 1963 (10.4/7.6ma)
7AF7 Sylvania branded Raytheon NOS gray round plates NOS 1948 printed in 1952 (10/10ma) 1-2% section balance
7F7 Sylvania round black plates used/good 1960's (1.9/1.7ma)
JG-6021 GE gray plates NOS 1962 (6.4/5.5ma)
JHS-12AU7 Sylvania "black plates" with "D" getter used/mis-matched sections (7.6/12ma)
