1 tube) 291A Western Electric NOS 1972 (45/25)

Tested on TV-7D/U

General Info

Pentagrid converter with cathode

10V Filament

Vplate=180V

Vgrid1=-7.5V

Vgrid2=180V

Vgrid3=75V

Vgrid4=-3V

Vgrid5=75V

Mu=275

Gm=690

Rp=400Kohms