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Description
1 pair) 31 Sylvania rebranded Zenith NOS 1940's
1 tube) 12.8ma Gm=1000
1 tube) 13.6ma Gm=1100
Matched on Amplitrex
Vplate=180V
Vgrid=-30V
Good NOS Ma = 12.3ma
Good Gm = 1000
