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(!!!) (Best tipped top pair) 448A Western Electric tipped top used/tests like new 1965 (35.5ma and 36.4ma) (Matched on Amplitrex)

(!!!) (Best tipped top pair) 448A Western Electric tipped top used/tests like new 1965 (35.5ma and 36.4ma) (Matched on Amplitrex)

By Tube World

$ 179.99

1 pair) 448A Western Electric "tipped top" used/tests like new D getter halo 1965 in white boxes

1 tube) 35.5ma Gm=27,300

1 tube) 36.4ma Gm=27,900

 

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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