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(!) 448A Western Electric smooth top used/good 1971 (1 pair: 28ma and 29.4ma) (Matched on Amplitrex)

(!) 448A Western Electric smooth top used/good 1971 (1 pair: 28ma and 29.4ma) (Matched on Amplitrex)

$ 89.99

1 pair) 448A Western Electric smooth top "D" getter halos used/good  - reboxed

1 tube) 28.0ma Gm=24,000 faded top getter

1 tube) 29.4ma Gm=24,200 good top getter

 

Amplitrex Test Data:

Vplate=135V

Vscreen=135V

Vgrid=-2

Good Ma range 20-30ma

Good Gm = 23,000 - 27,000

 

DIY pentode

See more: vacuum tube
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