This is the only known example of this valve. It was made by General Electric for Hammond for use within torpedo guidance system research.Thanks to Joe Gruber for sending the images.The balloon envelope is 42 mm in diameter, and including the UV base pins is 120 mm tall.References: Joe Gruber |
Updated November 26, 2020. shape:balloon construction:pinch type:triode age:pre.1920 base:uv pins:4 pin:
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