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ID = 28733
Tube type:  Triode, vacuum 
  <1925 very rare. ***
Identical to R8
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
1916 : British Radio Valves - The Vintage Years, Thrower
Predecessor Tubes TMC  

Base Europe 3-Pin (B3, H) 2 Top contacts
Was used by Military and/or Government
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Parallel / series AC/DC
Description Horned High Frequency valve like the french TMC. First made 1916. Osram GEC and Mullard (1922). UK Navy type NR8 
Dimensions (WHD)
incl. pins / tip
x 105 x 53 mm / x 4.13 x 2.09 inch
Weight 70 g / 2.47 oz
Literature Saga of the Vacuumtube, Tyne   page 221
British Radio Valves - The Vintage Years, Thrower   pages 40 & 79
R8: Anonymous Australian Collector
Fin Stewart


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