7X7 Sylvania branded Tungsol NOS (3 in stock)
7X7=XXFM Sylvania branded Emerson NOS 1949 (97/60)
7Y4 Brimar England NOS 1950's (4 in stock) (rectifier)
7Y4 US Brands NOS (5 in stock) (rectifier)
7Y4 used/good (2 in stock)
7Z4 US Brands NOS (8 in stock)
7Z4 US Brands used/good (2 in stock)
7A4=XXL Sylvania NOS (2 in stock) (Hallicrafters)
7B7 Sylvania NOS 1946
(!!) 7N7 Sylvania branded Philco used/good short bottle parallel gray plates 1948 (7.2/7.6ma)
7N7 Sylvania branded GE chrome top used/good 1956 (6.0/6.2ma)
7B4 US Brands NOS (3 in stock)
7C6 Sylvania NOS branded RCA 1952 (24/15)
7C6 RCA Victor like new 1948-1950 (23/15)
7F7 Sylvania round gray plates NOS 1952 (2.4/2.5ma)
7F7 Sylvania staggered round black plates NOS 1957 (2.2/2.2ma)
(!) (Recommended Single) 7F7 Sylvania rebranded JAN-CBRZ-7F7 round gray plates used/like new 1940's (2.9/3.2ma) (highest testing single)
7F7 Sylvania rebranded GE round gray plates NOS 1952 (2.0/2.4ma)
7AU7 Raytheon by Hitachi Japan NOS (5 in stock)
7F8 Sylvania NOS 1946-1947 (91/60 and 94/60)