(!!!) (Best Pair #2) 448A Western Electric “”tipped top”” used/tests like new D getter halo 1965-1966 reboxed (30ma and 31.8ma) (close Gm matching)

1 pair) 448A WE “”tipped top”” used/tests like new D getter halo 1965-1966 reboxed

1 tube) 30.0ma Gm=26,800 1965

1 tube) 31.8ma Gm=26.600 1966

Amplitrex Test Data:

Vplate=135V

Vscreen=135V

Vgrid=-2.5V

Good Ma range 18-25ma

Good Gm = 25,000

DIY pentode