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(!!!) (Recommended Pair) 6C8G National Union round black plates 1950 era used/very good (3.4/2.8ma and 3.3/3.4ma) (very close Gm)
(!) 6SL7GT RCA burgundy base NOS 1951 (1.7/1.8ma)
6C8G CBS NOS 1950's (like RCA) (3.7/4.1ma)
