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(PAIR) 6SK7GT Sylvania branded Westinghouse used/very good 1940's (8.5ma and 8.5ma)
6SK7GT National Union NOS 1950 smaller top getter (8.2ma)
6SK7GT RCA used/strong 1940's (9ma)
6SK7GT Sylvania used/good 1940's (7.3ma)
6SK7GT Tungsol used/good 1949 (6.8ma)