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Catkin

 
See also:
Catkin Valves - The Metal Valve
    
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The Catkin valve was introduced in 1931 and its revolutionary construction reduced inter electrode capacitances. Beneath the screening shell is a small diameter copper/glass envelope. The actual Type designation was not visible.
This valve is probably an MS4B.
The thin metal tube envelope is 32 mm in diameter and, excluding the B5 base pins, is 104 mm tall.
Reference: Observation. Type Catkin was first introduced in 1931.

 

Updated April 26, 2013.
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