(!!!) (Best Pair) 26 Sylvania branded Zenith black plate NOS 1946 (5.4ma and 5.6ma) (rare)

1 pair) 26 Sylvania branded Zenith black carbonized plate NOS 1946 (rare)

1 tube) 5.4ma Gm=1000

1 tube) 5.6ma Gm=1100

Matched on Amplitrex

Vplate=180V

Vgrid=-14.5V

NOS Ma = 5.2-6.0ma

NOS Gm = 1000-1100