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5691 RCA Red Base Black Plates used 1948 (2.2/2.4ma) (Gm=62% and 75%)
6B7 Raytheon NOS 1950 era (2 in stock)
6B7 RCA Emerson NOS 1940's
6B7 Sylvania engraved base tests like new 1930's
6D6 Tungsol NOS (77/40)
6D7 Panama green coated glass - flaked off in one area due to old age 1930's (52/31) (rare)
6E5 RCA NOS 1970's (bright eye)
6SQ7GT FM Co. by Sylvania used/good 1949 (0.9ma and Gm=800)
6V6GT GE Delco used/good crack in base 1952 (36ma)
