The 2D21 is a miniature, 4-electrode, Inert-gas-filled Thyratron with negative control characteristics for use in relay and grid-controlled rectifier applications. Operating characteristics of the tube include a high-control ratio essentially independent of temperature over a wide range, low grid-anode capacitance and very low grid current.
0.6A Heater current
0.5A Peak cathode current
0.1A Average cathode current
10MΩ Control-grid circuit resistance
8V Anode voltage drop
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