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(!) 6DQ6B RCA NOS 1970's (75ma)
(!) 6EU7 RCA NOS 1970 era (51/32 and 52/32)
(!) 6F6G Sylvania coated glass used/good 1940's (36.8ma)
(!) 6F6G Sylvania Philco NOS 1949 (36.5ma)
(!) 6F6GT GE Coronado NOS 1956 (36.8ma)
(!) 6J7GT Hytron used/strong 1940's (2.6ma)
(!) 6JS6C GE branded RCA NOS 1970's (55ma)
(!) 6L6Y RCA metal can (Y=brown bottom) NOS 1955 (78.8ma)
(!) 6L6Y RCA metal can (Y=brown bottom) NOS 1964 (72ma)
(!) 6L6Y RCA metal can (Y=brown bottom) NOS 1966 (77ma)
(!) 6SK7GT Philco by Sylvania chrome top 1952 (10ma)
(!) 6SQ7 Sylvania NOS 1951 (0.9ma and Gm=1000)
(!) 6V6 Tungsol metal can used/good 1955 (33.5ma)
(!) 6V6GT Sylvania used/good 1946 (38ma)
(!) 6V6GTY GE Canada brown base black plate NOS 1970 (42.5ma) (similar to RCA black plate)
(!) 6X4 Philco by Sylvania NOS "D" getter 1959 (54/40 and 55/40)
(!) 6X4 Philco by Sylvania NOS 1961 (51/40 and 52/40)
(!) 6Y6G=VT-168A Raytheon coated glass NOS 1944 (60ma)
(!) 6ZY5G Philco NOS 1940's (50/40 and 54/40)
(!) 75=VT-75 Sylvania Zenith used/good 1930's (27/19)