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6C6 Philco NOS 1940's (8 in stock) (special price)
6C6 Raytheon used/tests like new 1930's hairline crack in base (2.1ma)
6C6 RCA like new 1953 (2.0ma)
6C6 RCA used/tests like new 1940's (48/31) (2.0ma)
6C6 Sylvania NOS 1950 (48/31)
6C6 Tungsol NOS 1955 (45/31 and 2.1ma)
6C7 Majestic coated glass NOS (2 in stock)
6C8G CBS NOS 1950's (like RCA) (3.7/4.1ma)
6C8G Raytheon round black plates used/tests like new 1940's (3.6/3.4ma)
6C9 US Brands NOS (0 in stock)
6CA4 GE branded Tungsol like new 1960's (55/40 and 56/40)
6CA4 Philco by Sylvania NOS 1960's (52/40 and 52/40)
6CA4 RCA branded Super Airline NOS 1960 era (54/40 and 54/40)
6CA4 Silvertone by Sylvania NOS 1960 era (54/40 and 54/40)
6CA4 Sylvania NOS 1960 era (54/40 and 54/40)
6CA4 Sylvania NOS 1960's (52/40 and 53/40)
6CA4=EZ81 RCA used/good 1962 (53/40 and 53/40)
6CA4=EZ81 Sylvania used/good 1960's (53/40 and 53/40)
6CA5 GE NOS
6CA7=EL34 Siemens Germany skinny bottle branded CEI NOS 1975 (79ma)