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The CV398 is the same as the commercial P535/1E tetrode pulse modulator, and this exhibit carries both identifications. The commercial exhibit has the STC data-sheet and here we have the CV specification on the PDF link.

The KB/F identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the F identifies the maker as STC, Paignton.

The coating to enhance heat radiation from the anode is sprayed on.

The wide glass tube envelope is 64 mm in diameter, and excluding the B4A base pins is 136 mm tall.

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.