Sovtek Russian Military NOS 6C33C-B Valve

Used in the Russian MIG-25 fighter plane and found after a Russian fighter pilot defected to the west in 1976.

The 6C33C-B triodes are intended to work as a regulating valve in electronic stabilizers of voltage. Consisting of two triodes (A and B) in the same glass envelope. Cathodes, grids, and plates are Internally connected in parallel. The filaments are lead out separately for each triode.

Manufacturers: Ulyanov
Svetlana (production stopped before 1980)
Envelope: Hard glass casing
Mass: 200g
Height: 130 mm
Diameter: 65 mm

Max data
Max anode voltage - 400
Anode dissipation - 60 W
continuous cathode current - 600 mA
Overall length - 133 mm max
Diameter max - 64 mm

Typical data
Anode voltage - 120
Anode current - 550 mA
Transconductance, gm - 40 mA/V
Anode resistance - 80 ohm
Grid voltage -19 V
Heater voltage - 6.3 V
Heater current - 6.4 A