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(!!) JG-12AY7 GE "D" getter 1956 used/good (2.1/2.3ma)
6336B Cetron USA used/good 1981 (74ma/92ma) ***
(!!!) 231=31 US Made Balloon NOS 1920's (14.2ma)
(!) 80 Hygrade Sylvania experimental tube used/strong 1940 era (54/40 and 52/40)
6F6GT Sylvania used/good 1949 broke off guide pin (32ma)
QE05/40=6146 Adzam France NOS 1960's (80ma)
(!!!) 6336 Chatham metal plates used 1957 (57/53ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (4.0ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.8ma)
7241 Tungsol used - sold as-is untested - 1959 (1 in stock)
5608A Tungsol NOS made for Barber Colman (Wheelco Instruments) 1959-1971 (0 in stock)
(READ REVIEW) 6SL7GT Tungsol tall bottle gray ribbed plates around 1960 (2.2/1.6ma)
(READ REVIEW) 6SN7GT Tungsol tests like new black coated glass and black round plates 1945 (9.2/9.0ma) (close triode balance)
12A6GT Tungsol coated glass NOS 1943 (0 in stock)
(!!!) (Recommended Single) EF94=6AU6 Tungsol used/tests like new 1957 (10ma)
5AS4A Tungsol black plates NOS "D" getter halo 1950's (56/40 and 58/40)
5W4GT Tungsol NOS 1952 (52/40 and 54/40)
7867 Tungsol NOS 1960's
6627=0B2WA Tungsol Chatham NOS 1950's (0 in stock)
(!!) (Best Tungsol #1) 6SL7GT Tungsol gray ribbed plates NOS 1950's (2.3/2.5ma) (Same Gm)
