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(!!!!) (Best Overall Pair) 71A National Union NOS 1940's rebranded Arcturus in 1967 (28ma and 29ma) (Highest Ma and Gm)

(!!!!) (Best Overall Pair) 71A National Union NOS 1940's rebranded Arcturus in 1967 (28ma and 29ma) (Highest Ma and Gm)

$ 118.88

1 pair) 71A National Union NOS 1940's rebranded Arcturus in 1967 1-2% matched

1 tube) 28ma Gm=2100

1 tube) 29ma Gm=2100

 

Matched on Amplitrex 

Vplate = 180V

Vgrid = -38V

Good Ma = 20ma

Good Gm = 1700

  

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


Typical Characteristics:

Vplate=135V, Vgrid=-27, Iplate=17.5ma, Rplate=1.82Kohms

Gm=1650, Mu=3, Rload=3Kohms, Pout=0.4watts

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