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This exhibit is a B6 detector triode. It is a soft valve but the ions within are not specified. The heater is wound around the pinch stem. The construction points to the use of sodium ions as with his earlier valves.
The designer was Dr H P Donle, (chief engineer at ). In 1925 Dr H P Donle left the Connecticut Telephone and Electric Company to establish his own company - the Donle Bristol Corporation of Meriden, Connecticut.
The original box.
Thanks to Joe Gruber for sending the images.
The wide glass tube envelope is 32 mm in diameter and, including the UX base pins, is 101 mm tall.
Reference: Joe Gruber & 1047. Type B6 was first introduced in 1926.


Updated November 26, 2020.
shape:wide.glass.tube construction:pinch type:triode age:1920.1930 base: pins:4 pin:
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