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PLAV9H

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ID = 37602
       
Country:
Germany
Brand: Huth, Signalbau AG, Dr. Erich Franz Huth (Signalbau Huth); Berlin später auch Hannover
Developer: Huth, Signalbau AG, Dr. Erich Franz Huth (Signalbau Huth); Berlin später auch Hannover 
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to PLAV9H
Similar Tubes
Other base:
  P1AV9 ; PLAV9A ; PLAV9D ; PLAV9S ; Plation
Base Huth base
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   
le228_huth_sockel~~3.gif PLAV9H: eigene Sammlung
Gerhard Eisenbarth
plav9_spec_2.png
PLAV9H: Riepka, Die Röhre, 1926
Anonymous 15 Collector
More ...
 
plav9h.jpg

 
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