Plate voltage 90. Designed as a special purpose RF amplifier-oscillator. First made 1926 with "Isolantite " base ( a type of ceramic). Tube was discontinued in 1928. There was no matching DV4 tube made.
Dimensioni (LxAxP) incl.pins/tip
34 x 107 x mm / 1.34 x 4.21 x inch
Bibliografia
- - Manufacturers Literature
Saga of the Vacuum Tube, Tyne Page 301
-- Collector info (Sammler)
DL4_deForest: O.F.
Otto Frosinn
Just Qvigstad
DL4_deForest: own collection
Peter den Boer † 2025
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