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This experimental disc seal UHF triode closely resembles the successful DET29 subsequently produced.
The heater is connected by the flying leads. The cylindrical connections are then:- cathode, grid and anode. The valve would be operated within a co-axial cavity for best results and highest frequency of operation.
The planar envelope is 12 mm in diameter and, excluding the base pins, is 55 mm tall.
Reference: Observation. Type Experimental was first introduced in 1917.

 

Updated January 22, 2013.
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