(!) (Recommended Pair) 76 Sylvania black plate branded Tungsol and Westinghouse NOS 1946 (5.6ma and 5.4ma)
(!) (Recommended Single) 5Z3G FAA RCA NOS 1962 (56/40 and 56/40)
(!) (Recommended Single) 6N7GT Raytheon coated glass NOS 1940's (3.2/3.5ma)
(!) (Recommended Single) 7F7 Sylvania rebranded JAN-CBRZ-7F7 round gray plates used/like new 1940's (2.7/3.0ma) (highest testing single)
(!) (SINGLE) 6F8G Sylvania Zenith coated glass parallel plates like new 1940's (9.0/8.4ma)
(!) (SINGLE) 6SL7GT RCA round black plates NOS 1970 (2.0/2.1ma)
(!) (SINGLE) 7F7=VT-189 Sylvania rebranded GE round black plates used/strong 1940's (2.2/2.3ma)
(!) (SINGLE) 841=VT-51 Hytron NOS 1940's (5.2ma Gm=1200)
(!) (SINGLE) 866A GE NOS 1971 (2 in stock)
(!) (SINGLE) 866A GE NOS 1971 (54/40)
(!) (slightly microphonic) 6SL7GT=VT-229 RCA round black plates like new 1942-1945 era (2.4/2.6ma)
(!) 203A Sylvania brass base tests like new 1930's
(!) 31 Ken Rad NOS engraved base 1940 era (11ma)
(!) 31 Tungsol NOS 1940's (11.8ma)
(!) 47 Cunningham used/good 1940's (26.6ma Gm=2020)
(!) 47 Raytheon engraved base box plate used/good 1930's (25.2ma Gm=1940)
(!) 47 RCA Radiotron engraved base used/good 1930's (27.5ma Gm=2250)
(!) 47 Tungsol Aristocrat low hours/tests like new 1940's (38ma Gm=2770) (highest mA and Gm)
(!) 6F6G=VT-66A Sylvania used/tests like new 1940's (45ma)
(!) 6L6Y RCA metal can (Y=brown bottom) NOS 1955 (78.8ma)
