(!!!) (Best Pair #1) 6GM5 Sylvania rebranded Tungsol and Sylvania NOS 1960 era (59ma and 60ma)

1 Pair) 6GM5 Sylvania NOS

1 tube) 60ma Gm=10,600 Sylvania rebranded Tungsol NOS

1 tube) 59ma Gm=10,200 Sylvania

Tested on Amplitrex

Good Current Range = 50-60ma

Good Gm range = 9500 – 10,000