3C18P / 3U18P tube. High-voltage kenotron
The 3C18P high-voltage kenotron has been designed to convert flyback pulse voltage of line scanning into direct voltage in television receivers.
All tubes new, military equipment and have "OTK" mark. Near equivalent: no have.
Type: High-voltage rectifier
Application: scan retreating pulses rectification
Cathode type: oxide-coated, indirect heating
Filament voltage,V: 3,15
Filament current,A: 0,19-0,23
Anode voltage,V: 100
Anode current,A: 0,008
Socket type: rsh4
Max.reverse anode voltage,kV: 25
All datasheets here.