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56 GE used/good 1940's (4.2ma)
56 Made in Holland NOS 1940's (5.1ma)
56 National Union engraved base used/tests like new 1930's (6.0ma)
56 National Union used/good 1940's (5.3ma)
56 National Union used/good 1940's (5.9ma)
56 National Union used/good 1950 small faded getter (4.1ma)
56 no name NOS 1950's (5.7ma)
56 Philco by Sylvania used/good 1940's (5.2ma)
56 RCA Balloon engraved base black plate tests like new 1930's (4.7ma)
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 RCA used/good 1940's (4.7ma)
56 RCA used/good 1940's plate slightly tilted (4.9ma)
56 Super Airline used/good 1940's (4.1ma)
56 Sylvania branded RCA NOS 1946 (6.0ma)
56 Tungsol rebranded Raytheon tests like new 1940's (6.1ma)
56 Ultron UK used/good 1952 (4.5ma)
5651 Sylvania rebranded GE NOS 1960's (2 in stock)
5651A Sylvania rebranded RCA NOS 1983 (1 in stock)
5687WA GE used/tests like new 1970's (44/45ma) (highest Ma and Gm)
