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56 Made in Holland NOS 1940's (5.1ma)
56 no name NOS 1950's (5.7ma)
56 RCA no name NOS 1940's getter halo screen loose at bottom of tube (6.5ma)
56 RCA no name NOS 1940's made for Radiotelefonica Argentia (5.1ma)
56 Sylvania branded RCA NOS 1946 (6.0ma)
56 Tungsol rebranded Raytheon tests like new 1940's (6.1ma)
5608A Tungsol NOS made for Barber Colman (Wheelco Instruments) 1959-1971 (0 in stock)
5876A Tungsol NOS 1968 (1 in stock)
5AS4A GE branded Tungsol "D" getter halo 1960 era (63/40 and 68/40)
5AS4A Tungsol black plates NOS "D" getter halo 1950's (56/40 and 58/40)
5U4GB Channel Master Japan 1960 double "D" getter halos low hours/tests like new (65/40 and 68/40)
5U4GB RCA used/good 1950's slightly tilted glass (55/40 and 56/40)
5U4GB RCA used/good 1968 (56/40 and 57/40)
5U4GB Sylvania used/tests like new 1960's (54/40 and 54/40)
5U4GB Tungsol used/good 1960 (51/40 and 60/40)
6080WB Raytheon black plates NOS 1966 (95/120ma)
6146A GE NOS 1960's (82ma)
6146A GE NOS 1965 (69ma)
6336A GE used/good 1960 era (74/79ma)
6336A RCA branded GE like new 1966 (88ma/110ma) ***