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71A Sylvania branded Raytheon NOS 1947 (22ma)

71A Sylvania branded Raytheon NOS 1947 (22ma)

$ 49.99

1 tube) 71A Sylvania branded Raytheon NOS 1947

22ma

Gm=1800

 

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

Pout=0.4watts

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