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(!!) (~ 3rd Best Pair ~) JAN-CHS-71A Sylvania NOS 1945 in white boxes (22ma and 25.5ma)

$ 89.99

1 pair) JAN-CHS-71A Sylvania NOS 1945 in white boxes

1 tube) 22.0ma Gm=1800 smeared printing: (JHS) wiped off glass (on left)

1 tube) 25.5ma Gm=1900 some white flakes or material stuck to inside top of glass

 

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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