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DER Valves - In the Beginning - Osram
collections The John Lawrence Collection |
This exhibit is an early DER triode. The thoriated tungsten filament and the planned use in receiving gave the valve its name - Dull Emitting Receiving.
Visual inspection shows that the anode cylinder of this valve is vertical within the envelope. Other examples of DER's, have horizontal anodes.
The balloon envelope is 48 mm in diameter and, excluding the B4 base pins, is 100 mm tall.
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This exhibit was last updated on 05 October 2006
Visual inspection shows that the anode cylinder of this valve is vertical within the envelope. Other examples of DER's, have horizontal anodes.
The balloon envelope is 48 mm in diameter and, excluding the B4 base pins, is 100 mm tall.
More
This exhibit was last updated on 05 October 2006
More
This exhibit was last updated on 05 October 2006
This exhibit was last updated on 05 October 2006 |