(!!!) (Recomended Balloon 50) CX-350 Cunningham Balloon used/good 1930 era - very good condition (44.2ma) (rare 50)

CX-350 Cunningham Balloon used/good 1930 era - very good condition - straight plate - centered filament - in white box

44.2mA

Gm=1850

Tested on Amplitrex

Vplate=440V

Vgrid=-66V

Good NOS mA range = 55-60ma

Good NOS Gm = 2100