(!) (Recommended Pair) 6GM5 Sylvania NOS 1960's - 1 tube branded Tungsol (55ma and 56ma)
6GM5 Sylvania branded RCA NOS (52ma)
6GM5 Sylvania branded Westinghouse NOS 1974 (48ma)
6GM5 Sylvania NOS no printing in RCA box (52ma)
