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KL1_MO

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ID = 19934
       
Country:
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to KL1_MO
Similar Tubes
Heater different:
  E415
First year Oct.1928 - - Manufacturers Literature Date of Marconi Publication No. 520A.
First Source (s)
Sep.1928 : - - Manufacturers Literature leaflet
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 3.5 Volts / If 2 Ampere / Indirect / Specified voltage AC/DC
Dimensions (WHD)
incl. pins / tip		 56 x 130 x mm / 2.20 x 5.12 x inch
Information source - - Manufacturers Literature   Pamphlet 243
History of the British Radio Valve to 1940   p. 173
7_107.png KL1_MO: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		kl11.png
KL1_MO: own collection
Peter den Boer † 2025
More ...

Collection of

Robert Gillespie (USA)
Alexander Hofer (A)
 
screenshot_20220403_142009_gallery.jpg

KL1_MO
 
Forum contributions about this tube
KL1_MO
Threads: 1 | Posts: 1
Hits: 838     Replies: 0
Production years
Tomasz Szczesniak
14.Nov.23 		  1
Production years 

I found this press ad form 16.X.1927 form "RAdjo - tygodnik ilustrowany dla wszystkich"

It says that PTR presented this tube on Warsaw Radio Fair in autumn 1927

[I can't upoad the ad, it can be found here
 
KL1_MO
End of forum contributions about this tube
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