NOS Soviet Rectifier tube kenotron 5C3S (5U4G, 5U3C).

GRAY ANODE!

One tube in one lot.

The date of manufacture of the tubes is different.

Tubes were tested on L3-3 tester and are 100% working. 

Technical characteristics and electrical parameters of the 5C3S lamp:

Double-anode kenotron 5C3S with a directly heated oxide cathode.

Designed for rectifying alternating current of industrial frequency 50 Hz.

Durability not less than 500 hours.

Weight not more than 72 g.

Filament voltage 5 ± 0.5 V

Filament current 3 ± 0.3 A

Nominal anode voltage (constant) 75 V

Nominal anode current (for each diode) 225 mA

Anode current limit (peak value) 750 mA

Reverse anode voltage limit (peak value) 1700 V

Rectified current nominal (average value) 230 mA

Rectified current limit (average value) 250 mA

Glass design with octal base