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(!!!) (Single 1955) JG-12AY7 GE "D" getter like new 1955 (3.3/2.7ma) (High Gm)
(!!!) (Single 1956) 12AY7 GE "D" getter like new 1956 (3.1/2.8ma)
(!!!) (Single) 5998A Sylvania JAN NOS 1980 (141/122mA) (close Gm)
(!!!) (Single) 6080 GE NOS 1970's (132/83ma)
(!!!) (Single) 6080 GE NOS 1974 (70/106ma)
(!!!) (Single) CK-5687 Raytheon black plates "O" getter like new 1960 (30/33.5ma)
(!!!) (slightly microphonic) 5687 Tungsol black plates "U" getter halo branded GE NOS 1950's (36/40ma)
(!!!) 12AY7 GE NOS rebranded Raytheon 1960's (2.8/3.4ma)
(!!!) 231=31 US Made Balloon NOS 1920's (14.2ma)
(!!!) 31 RCA Radiotron Balloon NOS 1920's (13.2ma)
(!!!) 35W4 RCA NOS 1970 era (52/40)
(!!!) 35W4 RCA NOS 1971 (51/40)
(!!!) 5881 Tungsol used/good 1957 (58ma)
(!!!) 6336 Chatham metal plates used 1954 (59/74ma)
(!!!) 6336 Chatham metal plates used 1957 (57/53ma)
(!!!) 6SN7GTB Tungsol brown base "U" getter used/good 1950's (7.0/8.2ma)
(!!!) 80 RCA used/strong new 1946 (54/40 and 58/40)
(!!!) CX-331 Cunningham NOS 1920's (12ma) (rare)
(!!!) JAN-CTL-6AR6 Tungsol NOS 1951 gray oval plates (88ma)
(!!!) USN-CRC-1629=VT-138 RCA NOS 1940 (bright eye) (oldest single)
