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(!!!) (Single) EC92=6AB4 Siemens Halske Germany branded Mullard 1964 (8.4ma) (mic)
(!!!) (Slightly microphonic Single) 6SL7GT Ken Rad NOS 1945 era (2.6/2.3ma)
(!!!) (slightly microphonic) JRC-5751WA RCA black plates triple mica D getter 1957 NOS (2.3ma/2.2ma) (1-3% section balance
(!!!) 12AU7 RCA tall gray plates "D" getter used/good 1953 (9.2/9.8ma)
(!!!) 12BH7A GE gray oval plates NOS "o" getter 1964 (11.4/10.2ma) (strong Gm)
(!!!) 12BH7A RCA branded Zenith NOS 1970 era (10/13.2ma)
(!!!) 12DW7=7247 CBS ribbed plates NOS 1960 (0.9ma/11.4ma)
(!!!) 201A Silvertone Balloon NOS 1930 era (1.8ma and Gm=500)
(!!!) 6336 Chatham metal plates used 1954 (59/74ma)
(!!!) 6336 Chatham metal plates used 1957 (57/53ma)
(!!!) 6DE7 GE Canada black plates NOS 1967 (4.6/42ma) (Woo Audio)
(!!!) 6DE7 GE Great Britain made in Japan NOS 1970 (3.8/30ma) (Woo Audio)
(!!!) 6DE7 GE Great Britain made in Japan NOS 1970 (5.6/24ma) (Woo Audio)
(!!!) 6DE7 Sylvania black plates "U" getter NOS 1950's (8/31ma) (Woo Audio)
(!!!) 6EU7 GE NOS pinched gray plates 1970 (48/32 and 50/32)
(!!!) 6EU7 RCA used/good 1963 (38/32 and 52/32)
(!!!) 6SN7GTB Westinghouse black plates copper grid posts "D" getter 1950's (7.2/8.4ma)
(!!!) 6V6G Super Silvertone by Sylvania used/good 1930's (37ma)
(!!!) 6X5GT RCA black plates NOS 1953 (50/40 and 54/40)
(!!!) 6X5GT RCA NOS 1953 (52/40 and 62/40)
