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40KG6A=PL519 JAPAN branded RCA tall bottle clear top NOS (1 in stock)
41 Philco engraved base used/good 1930's (72/40)
41 Sylvania Philco NOS 1952 (75/40)
42 National Union like new 1950 era (29.5ma) (Gm like new)
42 Philco engraved base used/very good 1930's (32.5ma)
42 Philco used/good 1940's (30.8ma)
42 RCA used/good 1940's (27.2ma)
42 Sylvania engraved used good 1940's (30ma)
42 Tungsol used/good 1940's (27ma)
42 Tungsol used/good 1940's (30ma)
42 Tungsol used/good 1940's faded printing (33ma)
4212E=212E STC England
421A Western Electric NOS 1984 (read review)
42KN6 Sylvania branded Raytheon NOS
43 GE NOS 1950 era (3 in stock)
43 National Union NOS 1950 era (3 in stock)
43 National Union NOS 1950 era (75/58)
43 Raytheon NOS 1947 (2 in stock)
43 Sylvania NOS 1947 (71/58)
43 US Brands used/good (6 in stock)
