radiomuseum.org
Please click your language flag. Bitte Sprachflagge klicken.

R4B_Marconi

Information - Help 
ID = 67234
       
Country:
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to R4B_Marconi = R4B_BTH = R4B_MO
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / Direct / Battery =
Description

The R4B was first made in 1918 and had an E12 base. In the following years, this was changed to B4. The date of the changeover is uncertain. The tube depicted has the MOV logo and this can be seen at the rear of the tube. It is quite posible that the tube was listed by the Marconi Scientific Instrument Co in one of their publications.

 
Dimensions (WHD)
incl. pins / tip		 x 86 x 50 mm / x 3.39 x 1.97 inch
Weight 33 g / 1.16 oz
Information source -- Original prospect or advert   as per advert in
British Radio Valves - The Vintage Years: 1904-1925   Pages 26, 40 and 122
Saga of the Vacuum Tube, Tyne
-- Collector info (Sammler)
b4_1~~67.png R4B_Marconi: Fin Stewart
Fin Stewart

Just Qvigstad

Collection of

Robert Gillespie (USA)
 
screenshot_20230101_134654_gallery.jpg

 
Forum contributions about this tube
R4B_Marconi
Threads: 1 | Posts: 1
Hits: 126     Replies: 0
September 16, 1922 Wireless World magazine advertisement
Alan Larsen
18.Jan.25 		  1
September 16, 1922 Wireless World magazine advertisement 
 
R4B_Marconi
End of forum contributions about this tube
You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
Data Compliance More Information