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DL7_deForest

Information - Help 
ID = 28518
       
Country:
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to DL7_deForest
First year 1926 ?? Saga of the Vacuumtube, Tyne Seite 301

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.5 Ampere / Direct / Battery =
Description

Plate voltage 135. First made 1926 with a black bakelite base. This was changed to "Isolantite" (a type of ceramic) in 1927 and the tube was discontinued in 1928. The bulb diameter was increased to 44 mm late in 1927.

 
Dimensions (WHD)
incl. pins / tip
34 x 107 x mm / 1.34 x 4.21 x inch
Literature Saga of the Vacuumtube, Tyne   Page 301 & 305
 
deforest_tubes_usa_dl7_1.jpg
DL7_deForest: Eigene Sammlung
Peter Kahlich

 
ux_base_standard~~25.png
DL7_deForest: Fin Stewart
Fin Stewart

 


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