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(!!!) 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)
(!!!) 7025 RCA ribbed gray plates used/good 1960's (Gm=1350/1600 and 0.6./1.1mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1960's faded printing (Gm=1400/1600 and 0.9/1.1mA) (V1 guitar amp)
(!!!) 7025 RCA ribbed gray plates used/good 1972 (Gm=1450/1400 and 0.9/0.8mA) (V1 guitar amp)
(!!!) 80 RCA used/strong new 1946 (54/40 and 58/40)
(!!!) 80 RCA Victor NOS 1948 (56/40 and 58/40)
(!!!) 83 Hytron by RCA used/tests like new 1940's slightly tilted top mica (60/40 and 62/40)
(!!!) 8417 GE NOS 1986 (103.5ma)
(!!!) CX-301-A Cunningham NOS 1930 era (2.6ma Gm=800)
(!!!) CX-380 Cunningham Balloon used/good 1930 era (46/40 and 56/40)
(!!!) USN-CRC-1629=VT-138 RCA NOS 1940 (bright eye) (oldest single)
