6C8G National Union NOS 1950 era (3.6/5.8ma)
6C8G=VT-163 Tungsol round black plates like new 1940's (3.1/3.2ma) 1-2% section balance
6F6G National Union black plate NOS 1951 (40.5ma)
6F6G National Union used/good mid-1940's (47ma)
6F6G RCA Cunningham used/good 1947 (31ma)
6F6G RCA NOS 1949 (35.8ma)
6F6G RCA NOS 1957 (42.2ma)
6K6GT GE coatd glass used/good 1949 (44ma)
6K6GT Ken Rad used/good 1951 hairline crack in base (34ma)
6SF5 GE used/good 1951 (1.1ma Gm=1200)
6SF5 Sylvania used/good 1949 (0.8ma Gm=1100)
6SQ7GT Fonoco by Sylvania used/strong 1951 (1.1ma and Gm=1100)
6SQ7GT Sylvania used/good 1951 (Gm=800)
6X4 GE branded AMC gray plates "O" getter NOS 1970's (54/40 and 57/40)
JHS-12AU7 Sylvania "black plates" with "D" getter used/mis-matched sections (7.6/12ma)
