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Description
1 pair) 448A Western Electric smooth top used/good 1965-1966 - reboxed
1 tube) 19.2ma Gm=25,000
1 tube) 20.8ma Gm=23,000
Amplitrex Test Data:
Vplate=135V
Vscreen=135V
Vgrid=-2
Good Ma range 20-30ma
Good Gm = 23,000 - 27,000
DIY pentode
