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(!!!) (#1 448A tipped top pair) 448A Western Electric tipped top used/test like new 1965 (40ma and 40.6ma) (Matched on Amplitrex)

(!!!) (#1 448A tipped top pair) 448A Western Electric tipped top used/test like new 1965 (40ma and 40.6ma) (Matched on Amplitrex)

$ 149.99

1 pair) 448A Western Electric "tipped top" used/tests like new D getter halo (6552=1965) same date codes reboxed

1 tube) 40.0ma Gm=29,100

1 tube) 40.6ma Gm=28,000

 

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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