(!!) 71A RCA/Cunningham NOS 1940 era (20ma) Title: 71A

71A RCA NOS 1940 era

20ma

Gm=1700

Tested 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