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(!!!) (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex)

(!!!) (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex)

$ 134.99

1 pair) 448A Western Electric "tipped top" used/good "D" getter halo in white boxes

1 tube) 28.0ma Gm=26,000 (6613=1966)

1 tube) 29.2ma Gm=26,000 (6526=1965)

 

Amplitrex Test Data:

Vplate=135V

Vscreen=135V

Vgrid=-2.5V

Good Ma range 18-25ma

Good Gm = 25,000

 

DIY pentode

 

 

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