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R3

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ID = 8081
       
Country:
Great Britain (UK)
Brand: Brimar (STC); Foots Cray
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to R3
Similar Tubes
Normally replaceable-slightly different:
  FW3 ; V90
Different maximum ratings:
  R2
First year 1934 -- Collector info (Sammler) According to models only.
Predecessor Tubes R2  
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Em)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2.5 Ampere / Half indirect
Description

Brimar Data book 1947-48 quotes mean rectified current as <120mA. Tube also branded Micromesh, an STC subsidiary

 
Information source History of the British Radio Valve to 1940   p. 142 & 176
Babani, International Radio Tube Encyclopaedia   p. 284 & 285
Taschenbuch zum Röhren-Codex 1948/49
Babani, International Radio Tube Encyclopaedia
150_9.png R3: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
Just Qvigstad 		r2_r3_brimar_no.4_p165~~1.png
R3: Brimar Radio Valves and Teletube Manual No.4
Adrian Riesen
More ...
Usage in Models 4= 1934 ; 1= 1935?? ; 1= 1935? ; 6= 1935 ; 3= 1936? ; 2= 1936 ; 1= 1937 ; 3= 1938 ; 1= 1946
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):22

Collection of

Jacob Roschy (D)
 
r3_19rm1762h.jpg

R3
 
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