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1608 RCA white ceramic base NOS in white box 1940 era (32.5ma)
245=45 Silvertone Balloon engraved base 1930 era used/tests like new (42ma Gm=2230)
257A Western Electric engraved base NOS 1930's (6 in stock) (257A is a 231D with a top cap grid connection)
257A Western Electric printed base NOS 1954
257A Western Electric printed base NOS 1960
27 National Union engraved base used/good 1930's (4.4ma)
281A Western Electric like new 1930's (38ma)
282A WE Balloon engraved base, like new, good 1.5" getter circa 1935 (sold out)
338A WE "engraved base" early 1940's like new
338A Western Electric NOS (7 in stock)
41 Triad engraved base used/strong 1930's (70/40)
41 US Brands used/good (40 in stock)
46 Ken Rad branded Coronado used/tests like new 1940's (52.5ma Gm=2700)
46=VT-63 Ken Rad low hours/tests like new 1940's (57.2ma Gm=2660)
46=VT-63 Tungsol NOS 1940's (56.5ma Gm=3100)
485 National Union used/good 1940's (6.2ma)
485 Sparton engraved base used/good 1936 (5.5ma)
485 Sylvania engraved base used/good 1934 (8.3ma)
485 Sylvania used/good 1930's no printing (7.9ma)
51 Arcturus Blue Balloon used/very good 1930's (46/26)
