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R4B_MO

Information - Help 
ID = 28728
       
Country:
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Tube type:  Triode, vacuum   Universal 
Identical to R4B_MO = R4B_Marconi = R4B_BTH
First Source (s)
1918 : British Radio Valves - The Vintage Years, Thrower p.26
Predecessor Tubes R4A  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Military and/or Government
Filament Vf 3.8 Volts / If 0.65 Ampere / Direct / Battery =
Description

This tube was made with either a European B4 base or an Edison E12 base (the measurements above are for a tube with E12 base). In the latter case, the plate and grid connections were from wire leads on the top of the bulb. First made by Osram GEC June 1917. Two tubes are known to exist where the E12 base is in place but was not used.

 
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 Saga of the Vacuum Tube, Tyne   page 380
- - Manufacturers Literature   Gec cat. about 1924
- - Manufacturers Literature
 
uk_gec_r4b.jpg
R4B_MO
Alan Scott Douglas † 16.11.15

 
b4_1~~70.png
R4B_MO: Fin Stewart
Fin Stewart

 
r4br4csmall.png
R4B_MO: own collection
Peter den Boer


from Just Qvigstad


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