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This De Forest Audion valve is a very early production type from 1910.
The filament is a single strand formed into two loops. It is probably pure tungsten and would be bright like a filament lamp in operation. The grid is a crude zig zag of thick wire, and the anode is a rectangular plate. The whole construction being of parallel planes. The filament connects to an Edison screw base. The grid and anode connect at the top via silk covered wires.
The balloon envelope is 48 mm in diameter and, excluding the base pins, is 90 mm tall.
This exhibit was last updated on 02 December 2007
The filament is a single strand formed into two loops. It is probably pure tungsten and would be bright like a filament lamp in operation. The grid is a crude zig zag of thick wire, and the anode is a rectangular plate. The whole construction being of parallel planes. The filament connects to an Edison screw base. The grid and anode connect at the top via silk covered wires.
The balloon envelope is 48 mm in diameter and, excluding the base pins, is 90 mm tall.
This exhibit was last updated on 02 December 2007
This exhibit was last updated on 02 December 2007
This exhibit was last updated on 02 December 2007 |