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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