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R_Marconi

Information - Help 
ID = 28718
       
Country:
Great Britain (UK)
Brand:
Tube type:  Triode, vacuum   Universal 
Identical to R_Marconi = TM
Similar Tubes
Other shape (e.g. bulb type):
  R_England
Normally replaceable-slightly different:
  ES4 ; RA_Mullard
Other class quality (otherwise equal):
  R5V
First year 1922 Saga of the Vacuum Tube, Tyne page 380
Predecessor Tubes TM  
Successor Tubes 1925   R5V  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Battery =
Description

British version of the French TM of 1916. Tubes originally branded
Marconi's Wireless Telegraph Co. From the formation of the M O V co Ltd in 1919, the brand was changed to Marconi Osram. Tipless bakelite base versions of the tube were made from late 1925

 
Dimensions (WHD)
incl. pins / tip
x 118 x 55 mm / x 4.65 x 2.17 inch
Weight 52 g / 1.83 oz
Tube prices 8 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   1925 Brown Brothers Catalog 217
The Saga of Marconi Osram Valve   20 page references
 
rm.o.v.marconivalve_3_klein_klein.jpg
R_Marconi
Geri Meier

 
r_marconi_so.png
R_Marconi: rtt
Michael Schlör

 

from Just Qvigstad

Usage in Models 2= 1920? ; 7= 1922 ; 3= 1923

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):12


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