(!) (slightly microphonic) 5751 Sylvania rebranded RCA black plates triple mica "D" getter used/good 1950's (2.0ma/2.2ma)
(!) (~ Recommended Pair ~) 6HQ5 Sylvania branded Raytheon NOS 1970 era same build (13.2/14.6ma)
(!) (~ Recommended Pair ~) 6HQ5 Sylvania NOS 1970 era same build (12.5/13ma)
(!) 0B2=108C1 Valvo Germany like new in white boxes 1960 era (neon gas)
(!) 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)
(!) 5BQ7A RCA black plates NOS 1964 (11.6/14.4ma)
(!) 6DE7 GE Admiral black plates NOS 1965 (4.5/27ma) (Woo Audio)
(!) 6DJ8 Sylvania NOS 1972 (14/16ma)
(!) 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)
(!) 6X4 Philco by Sylvania NOS 1961 (51/40 and 52/40)
(!) 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 Ken Rad ST-shape tests like new mid-1940's (52/40 and 54/40)
(!) 80 National Union used/strong 1940's (53/40 and 56/40)
