SG303S-1 SOVIET TINY MILITARY VOLTAGE REGULATOR VACUUM TUBE 4pcs 1973

Tubes never used, old stock.
date: all - 1973
Lot of 4 tubes.
Cathode: pin No 1 and 3, Anode: pin No 2.
Type: Gas stabilizer
Cathode type: Cold
Filling: Hydrogen
Envelope: glass miniature
Ignition voltage: 1320 V
Stabilized voltage: 1220-1280 V
Current: 10...100 uA (0.01...0.1mA)
Ready time: 15sec
Temperature coefficient of voltage stabilization:
< 0.83 V/*C in the temperature range +20...+85*C
< 0.42 V/*C in the temperature range +20...-60*C

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