(!!) (Recommended Pair) 12HG7=12GN7A Sylvania coated glass NOS 1970 era (52ma and 55ma)
(!!) (Recommended Pair) 12HG7=12GN7A Sylvania NOS 1970 era (42ma and 43ma)
(!!) 12BY7 Sylvania coated glass NOS 1953 faded printing (21.5ma)
(!) (PAIR) 12HG7=12GN7A Sylvania branded RCA coated glass NOS (37ma and 40ma)
(!) (PAIR) 12HG7=12GN7A Sylvania branded RCA coated glass NOS (51ma and 52ma)
(!) 12HG7=12GN7A GE USA NOS (52ma and 56ma)
(!) 12HG7=12GN7A GE USA NOS (62ma and 66ma)
(!) 12HG7=12GN7A GE USA NOS (71ma and 68ma)
12BV7=12BY7A Tungsol NOS 1960 era (35ma)
12BY7A GE Motorola NOS 1973 (21ma)
12BY7A GE NOS "U" getter 1961 era (25ma)
12BY7A Motorola by Sylvania NOS 1960's (21ma)
12BY7A RCA NOS 1966 (20ma)
12BY7A RCA used/good 1960's (21ma)
12BY7A RCA used/good 1960's (23ma)
12BY7A Sylvania branded RCA NOS (20ma)
