(!!!) (Best Pair) 6V6 Sylvania metal can NOS 1970 era (37.0ma and 37.5ma) 1-2% matched

1 pair) 6V6 Sylvania metal can NOS 1970 era

1 tube) 37.0ma Gm=3900

1 tube) 37.5ma Gm=3880

Good mA range 35-45mA

Good Gm range 3500-4000+