(!!!) (Best Overall UV-99) C-299=UV-99 Cunningham NOS 1920's with tube data sheet (3.4ma) (highest Ma) (UV have small pins)

C-299=UV-99 Cunningham NOS 1920's original box with tube data sheet

Iplate=3.4ma

Gm=400

Vplate=90V

Vgrid=-4.5V

NOS mA 2.5ma+

NOS Gm 300-400

(UV-99 and UX-99 have a 3.3V @ .063ma Filament, UV base has smaller size pins)