(!!) (Best Pair) 5719 Sylvania Gold Brand NOS 1952 in white boxes (0.9ma/0.8ma) 1-3% matched

1 matched pair) GB-5719 Sylvania Gold Brand NOS 1952 (similar to 6AD4) 1 tube) 0.9ma Gm=2100 1 tube) 0.8ma Gm=2000 Matched on Amplitrex: Vplate=100V Vgrid=-1V NOS mA = .75mA NOS Gm = 1700 - T3 subminiature audio triode - 5719=6AD4 with same Mu but Gm raised to 1700 - Computer-Rated