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(!!!!) (RCA Single) 6F8G RCA round black plates tests like new 1940-1945 no printing (9.6/9.8ma) (1st series made)
(!!!) (BEST SINGLE) JAN-CRP-6F8G=VT-99 Raytheon parallel black plates 1944 (8ma and 8ma)
6F8G GE parallel plates NOS 1940's (8.0ma and 8.4ma)
6F8G RCA gray ribbed staggered plates NOS no printing 1950 era (7ma/8ma)
6F8G RCA Radiotron staggered black ribbed plates used/good 1940's (9.0/7.2ma)
