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6Q7G Tungsol used strong 1940's (38/20)
6Q7GT Coronado 1940's tests like new (39/20)
6Q7GT Philco used/good 1947 (32/20)
6Q7GT Sylvania NOS 1947 hairline crack in base (30/20)
6Q7GT Zenith by Sylvania NOS 1946 (39/20)
6Q7GT Zenith NOS 1950's (31/20)
6Q7GT Zenith NOS 1950's (34/20)
6R7 Hytron metal NOS 1951 (115/60)
6R7 metal NOS (5 in stock)
6R7 Sylvania metal used/like new 1940's (88/48)
6R7GT Haltron England 1940's tests like new (85/48) strong single
6R7GT Ken Rad NOS 1944 (100/48)
6R7GT Ken Rad NOS 1944 (108/48)
6R7GT RCA NOS 1940's (2 in stock)
6SC7 GE NOS 1960's (1.7/2.0ma) (Fender, Silvertone)
6SC7 GE NOS 1970 era (1.6/1.7ma) 1-2% section balance
6SC7 GE NOS 1970 era (1.9/2.1ma)
6SC7=VT-105 RCA used/good 1940's (1.4/1.5ma)
99=X-199 Silvertone NOS 1934 (2.5ma, Gm=500) (strong single)
99=X-99 RCA Radiotron NOS 1930's in sealed box (2.2ma)
