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PLAV9D

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ID = 37604
       
Country:
Germany
Brand: Huth, Signalbau AG, Dr. Erich F. Huth (Signalbau Huth); Berlin später auch Hannover
Developer: Huth, Signalbau AG, Dr. Erich F. Huth (Signalbau Huth); Berlin später auch Hannover 
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to PLAV9D
Similar Tubes
Other base:
  P1AV9 ; PLAV9A ; PLAV9H ; PLAV9S ; Plation
Base Telefunken base 4 pin
Was used by Radio/TV-reception etc.
Filament Vf 1.25 Volts / If 0.08 Ampere / Direct / Battery =
Description

This gridless triode was developed so as not to infringe with the Lee de Forest patent (owner RCA) on the control grid. Instead, the plate close to the filament has influence on the electron flow towards the other plate (anode).
For marking purposes, the upper part of the glass bulb of the PLAV9 tubes was painted blue, at least for a while.

 
Text in other languages (may differ)
Information source -- Original prospect or advert   

Just Qvigstad 		plav9_spec_1.png
PLAV9D: Riepka, Die Röhre, 1926
Anonymous 15 Collector
More ...
 
plav9d.jpg

 
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