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(!) 203A Sylvania brass base tests like new 1930's
(!) 31 Ken Rad NOS engraved base 1940 era (11ma)
(!) 31 Tungsol NOS 1940's (11.8ma)
(!) 5687 RCA black plates used/good 1961 (33/33.5ma)
(!) 5751 GE gray plates double mica used/good 1970's no printing (2.0/2.3ma)
(!) 5751 GE gray plates double mica used/very good 1960's no printing (2.2/2.1ma) (strong Gm)
(!) 6BQ5 Sylvania Senith black plate NOS 1964 (50ma)
(!) 6DE7 GE Admiral black plates NOS 1965 (4.5/27ma) (Woo Audio)
(!) 6DQ6B RCA NOS 1970's (75ma)
(!) 6F6GT GE Coronado NOS 1956 (36.8ma)
(!) 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)
(!) 6V6GT Sylvania used/good 1946 (38ma)
(!) 6V6GTY GE Canada brown base black plate NOS 1970 (42.5ma) (similar to RCA black plate)
(!) 6V6GTY GE Canada brown base black plate tests like new 1961 (41ma) (similar to RCA 6V6GTA black plate)
(!) 80 Delco by Sylvania ST-shape used/tests like new 1947 rattle inside base (57/40 and 60/40)
(!) 80 GE Uruguay GT-shape NOS 1950's tilted glass (58/40 and 60/40)
(!) 80 Hygrade Sylvania experimental tube used/strong 1940 era (54/40 and 52/40)
(!) 80 Ken Rad ST-shape tests like new mid-1940's (52/40 and 54/40)
