12SK7GT RCA NOS 1940's (8.6ma)
12SK7GT RCA NOS 1940's (9.0ma)
12SK7GT RCA NOS 1940's (9.2ma)
12SK7GT Rogers Canada used/tests like new 1950's slightly tilted glass (8.8ma)
12SK7GT Sylvania branded Westinghouse chrome top NOS 1955 (8.5ma)
12SK7GT Tungsol used/tests like new 1940's, 50% of base is rusted/tarnished (8.6ma)
12SK7GT Wizard by Sylvania used/good 1940's (7.5ma)
12SK7Y GE NOS 1957 (9.6ma)
