(!!!) (Recommended Pair) 311B Amperex made in Russia NOS 1977 (37.2ma and 38.5ma) (Highest mA and Gm)
(!!!) (Recommended Pair) 311B WE used/good 1960-1961 partially faded getters (24.5ma and 26.5ma)
(!!!) (Recommended Pair) 407A Western Electric like new 1966-1967 (40-45/26 and 40-48/26)
(!!!) (Recommended Pair) 407A Western Electric used/very good 1961-1964 (40-41/26 and 38-40/26)
(!!!) (Recommended Single) 310A Western Electric large punch plate NOS 1963 (8.2ma)
(!!!) (~ RECOMMENDED PAIR ~) 329A Western Electric NOS 1956 (33ma and 34ma)
(!!!) (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex)
(!!!) 286A Western Electric "top printing" NOS 1942-1945 (6.6ma)
(!!!) 286A Western Electric "top printing" NOS 1942-1945 (6.9ma)
(!!!) 286A Western Electric "top printing" NOS 1942-1945 (7.3ma)
(!!!) 286A Western Electric Engraved Base NOS 1930's (6.6ma)
(!!!) 286A Western Electric NOS "top printing" 1942-1945 smaller side getter (7.6ma)
(!!!) 311B Western Electric used/like new condition 1960 (25ma)
(!!!) 418A Western Electric NOS 1952 original box (34ma)
(!!!) 418A Western Electric NOS 1952 original box (41ma)
(!!) (#1 244A Pair 1930's - 1940) 244A Western Electric NOS ST-14 "Engraved Base" 1930's - 1940 (4.1ma and 5ma) (matched on Amplitrex)
(!!) (1 set of 10 tubes) 404A Western Electric used/good 1963-1967 (set of 10)
(!!) (BEST PAIR) 272A Western Electric NOS "meshplate" 1961 and 1969 (6.1ma and 6.4ma)
(!!!) (Recommended Pair) 713A Western Electric by Tungsol NOS 1942-1943 (6.6ma and 6.9ma) (713A = 717A with black base)
(!!!) (Slightly microphonic single) JW-2C51=396A Western Electric "D" getter 1949 (6.2/6.4ma) (oldest 396A, 1st series made)