(!!!) (Best 12A Pair) 12A Coronado USA NOS 1940-1948 same build (7.0ma and 7.5ma)
(!!) (Recommended Single) JAN-CRC-1629 RCA NOS 1940's bright eye
(!!) (Recommnded Pair) 826 Ken Rad NOS 1942-1943 (1 pair)
(!) (Recommended Single) 7F7 Sylvania rebranded JAN-CBRZ-7F7 round gray plates used/like new 1940's (2.9/3.2ma) (highest testing single)
(DISPLAY TUBE - DOES NOT WORK) 838 RCA Radiotron around 1940 (DISPLAY TUBE WITH OPEN FILAMENT)
0D3 Tungsol NOS 1950's slightly tilted glass (argon)
24A Raytheon NOS 1940's (50/25)
24A RCA Cunningham engraved base NOS 1940 era (3 in stock)
291A Western Electric NOS 1972 (42/25)
291A Western Electric NOS around 1940 (1 pair)
42 Philco balloon engraved base used/good 1930 era (31ma)
42 Raytheon engraved base used/tests like new 1930's (33ma)
6F6G RCA Cunningham used/good 1947 (31ma)
6F6G RCA NOS 1957 (42.2ma)
800=VT-64 RCA Lab Development tube charcoal black plate used/good 1940 era (42ma, Gm=2150)
828 RCA used/very good 1957 original box
RGN 1054 Telefunken
RGN 1064 Telefunken Balloon NOS
VR-150=VT-139=0D3 Sylvania NOS 1940's (argon)