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DL4_deForest

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ID = 28516
       
Country:
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Triode, vacuum   RF/IF-Stage 
  Ca. 1925 up to 1945 rare.
Identical to DL4_deForest
Similar Tubes
Normally replaceable-slightly different:
  C509A ; UX201A
First year 1926 ?? Saga of the Vacuum Tube, Tyne Seite 301
First Source (s)
Aug.1930 : Philips Bulletin R1164, p. 32
Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =
Description

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.

 
Dimensions (WHD)
incl. pins / tip		 34 x 107 x mm / 1.34 x 4.21 x inch
Information source - - Manufacturers Literature   
Saga of the Vacuum Tube, Tyne   Page 301
-- Collector info (Sammler)
deforest_dl4_sock.png DL4_deForest: O.F.
Otto Frosinn

Just Qvigstad 		dl41_1.png
DL4_deForest: own collection
Peter den Boer † 2025
More ...

Collection of

David Erali (USA)
Giuseppe Antonio Tusini (I)
Robert Gillespie (USA)
Otto Frosinn (D)
 
dl4_deforest.jpg

DL4_deForest
 
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