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NR7A

Information - Help 
ID = 48179
       
Country:
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to NR7A
Similar Tubes
Normally replaceable-slightly different:
  NR7
Other characteristic (electr. data):
  NR13

Base IS-1 (Interservice, UK 1918) Sidecontact.
Was used by Military and/or Government
Filament Vf 3.5 Volts / Direct / Specified voltage AND current AC/DC
Description

This was among the last of the "R" series tubes manufactured for the UK Navy and is very similar to the NR7 and the NR13. Elements mounted vertical to axis of tube.

 
Dimensions (WHD)
incl. pins / tip
33 x 81 x mm / 1.30 x 3.19 x inch
Information source British Radio Valves - The Vintage Years: 1904-1925   p. 119

Collection of

 
nr7.jpg

NR7A
 

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