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71A National Union NOS in white box slightly tilted glass (28ma)

71A National Union NOS in white box slightly tilted glass (28ma)

$ 49.99

1 tube) 71A National Union NOS in white box slightly tilted glass and plate but works fine and tests strong

28ma

Gm=2000

 

Tested on Amplitrex

Vplate=180V

Vgrid=-38V

Good Ma = 20ma

Good Gm = 1600-1700

 

(71A=5V @ .25A Filament)

Mu=3

Rplate=1.82Kohms

Rload=3Kohms

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