Antique radios, Old Time Radios
NR7
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Country:
Great Britain (UK)
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Brand:
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| Tube type: |
Triode, vacuum Universal |
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<1925 very rare. *** |
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| Identical to |
NR7
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| Similar
Tubes |
Normally replaceable-slightly different:
NR7A
Other characteristic (electr. data):
NR13
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| Base |
IS-1 (Interservice, UK 1918)
Sidecontact.
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| Was used by |
Military and/or Government |
| Filament |
Vf 3 Volts / If 0.48 Ampere / 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 NR7A and the NR13. Elements are horizontal to axis of the tube. Also made by Mullard. Commercial type number R7
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Dimensions (WHD)
incl. pins / tip |
x 85 x 31 mm / x 3.35 x 1.22 inch |
| Information source |
British Radio Valves - The Vintage Years: 1904-1925 Pages 39, 40, 86 & 119
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Collection of
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| Data Compliance |
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