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The CV85 basket covered glass valve is designated as a trigatron. Within the envelope can be seen the domed spark gap molybdenum electrodes. The central trigger electrode can not be seen. See the above article.

The C by the up arrow identifies the maker as Edison Swan, Ponders End, pre Sept 1951.

It was used in the H₂S radar, and operated as a pulse modulator for the magnetron. It operated at 7 kV, and the pulse delivered to the magnetron was 150 kW.

The balloon envelope is 64 mm in diameter and it stands 144 mm tall.

Reference: Data-sheet.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.