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Unusual device, possibly a vacuum gauge.

Size This device measures 224x54mm overall.

 

This device is basically a triode in an envelope that is open at one end and coupled to a circular flange.

No information is known about this device. See further pictures below.

 Vacuum gauge?

 

Quarter view The flange is shown here. The hole is about 12mm diameter.
Inside view The internal structure is basically a directly heated triode.
Below: filament and grid assembly shown in detail. The filament is a single hairpin supported by the usual spring.
Filament Grid

 

 

This file was last modified 15:54:11, Saturday November 12, 2011