(!!!) (Recommended Pair) 76 Sylvania NOS – 1 tube branded National Union 1947 era same build (5.3ma and 5.6ma)

1 pair) 76 Sylvania NOS original boxes 1940”s same build

1 tube) 5.6ma Gm=1400 Sylvania 1947 era – mica flake inside tube

1 tube) 5.3ma Gm=1300 branded Nat. Union 1947

Matched on Amplitrex

Vplate=250V

Vgrid=-13.5V

Good Ma range = 4.5 – 5ma

Good Gm range = 1300-1400