1C21P / 1U21P tube near DY86 = 1S2 = 1S2A. High-voltage kenotron
The 1C21P high-voltage kenotron has been designed for use line scanning units of line-stabilized television receivers.
All tubes new, military equipment and have "OTK" mark. Near equivalent: DY86, 1S2, 1S2A.
Application: application in horizontal scan module
Cathode type: oxide-coated, indirectly heated
Filament voltage,V: 1,4
Filament current,A: 0,65-0,73
Anode voltage,V: 100
Anode current,A: 0,008
Socket type: rsh8
Max.reverse anode voltage,kV: 25
All datasheets here.