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The Mullard 1267 is a cold cathode Thyratron. When conducting the voltage drop across the valve is 90 Volts. The discharge is initiated by a voltage on the trigger electrode.

See also CV2174

The top mica disc fits tight to the envelope. The visible ribbed cylinder is a screen. The working electrodes are within.

The wide glass tube envelope is 30 mm in diameter, and excluding the IO base pins, is 81 mm tall.

Reference: Data-sheet. Type 1267 was first introduced in 1949. See also 1949 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.