(!!!!) (Best Overall Pair) 6146B Sylvania and Sylvania Amperex NOS 1970's same build (111ma and 116.5ma) (close Gm)
(!!!) (Best Pair) 12BY7A GE NOS 1970 (35ma and 35.5ma)
(!!) (Pair) 6146W GE JAN NOS 1987 (82ma and 84ma)
(!!) 12BY7 Sylvania coated glass NOS 1953 faded printing (21.5ma)
(!!) 6146B Sylvania branded RTC NOS 1960's (94ma)
(!!) 6146W Sylvania NOS 1970's (105ma)
(!) (Recommended Single) 12BY7A Tungsol NOS 1960 era (21ma)
12BV7=12BY7A Tungsol NOS 1960 era (35ma)
12BY7A GE Motorola NOS 1973 (21ma)
12BY7A GE NOS 1970 (37ma)
12BY7A Motorola by Sylvania NOS 1960's (21ma)
12BY7A RCA used/good 1960's (21ma)
