323B

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• Mercury-vapour thyratron: once the grid loses control and the tube fires, the grid cannot regain control until the anode voltage is removed or reversed.
• Must be operated within the specified ambient temperature range to ensure correct mercury vapour pressure.
• Allow adequate filament warm-up time before applying anode voltage to avoid cathode damage.
• The high filament current (7A at 2.5V) indicates a large-cathode, high-current design.
• Manufactured by both Western Electric and Chatham Electronics.

• https://frank.pocnet.net/sheets/127/3/323B.pdf