Sharp-Cutoff Tetrode
The 22 Vacuum tube is a screen grid type designed
particularly for radio-frequency amplification in
dry-battery-operated receivers employing 3.3 volt
filament tubes. It was first developed by RCA in 1932.
Electrical Data:
Filament Voltage ........................... 3.3 DC V
Filament Current ......................... 0.132 A