(!) 12HG7=12GN7A GE USA NOS (52ma and 56ma)
(!) 12HG7=12GN7A GE USA NOS (62ma and 66ma)
(!) 12HG7=12GN7A GE USA NOS (71ma and 68ma)
12BY7A Motorola by Sylvania NOS 1960's (21ma)
(!!) 12BY7 Sylvania coated glass NOS 1953 faded printing (21.5ma)
12BV7=12BY7A Tungsol NOS 1960 era (35ma)
12BY7A RCA used/good 1960's (21ma)
(!) (PAIR) 12HG7=12GN7A Sylvania branded RCA coated glass NOS (37ma and 40ma)
(!) (PAIR) 12HG7=12GN7A Sylvania branded RCA coated glass NOS (51ma and 52ma)
(!!) (Recommended Pair) 12HG7=12GN7A Sylvania coated glass NOS 1970 era (52ma and 55ma)
12BY7A GE Motorola NOS 1973 (21ma)
12BY7A GE NOS "U" getter 1961 era (25ma)
(!!) (Recommended Pair) 12HG7=12GN7A Sylvania NOS 1970 era (42ma and 43ma)
