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The Mullard Z300T (also Type 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 IO base pins showing that where there are internal connections the pins have been omitted.

Thanks to Mark Mallison for sending the images.

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

Reference: Data-sheet. Type Z300T was first introduced in 1957. See also 1957 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.