(!!) (Recommended Pair) 448A Western Electric tipped top used/good 1965 same date codes (26ma and 27.5ma) (close Gm matching)

1 pair) 448A Western Electric tipped top used/good 1965 same date codes

1 tube) 27.5ma Gm=26,700

1 tube) 26.0ma Gm=26,500

Amplitrex Test Data:

Vplate=135V

Vscreen=135V

Vgrid=-2

Good Ma range 20-30ma

Good Gm = 23,000 – 27,000

DIY pentode