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Sensibly equivalent to:
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The 1B40 is an argon filled Radar gas switching tube (TR Cell) that requires a separate cavity. Operation is at 1.08 GHz.
For more details look at page 36 in the attached book.
The keep-alive electrode is in the centre of the visible cylinder.
The keep-alive electrode and glass seal.
The method of mounting between two cavities.
The thin glass tube envelope is 12 mm in diameter and, including the base pin, is 39 mm tall.
Reference: Data-sheet. Type 1B40 was first introduced in 1945.


Absolute Maximum Operating Conditions
General Notes
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 14, 2021.
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