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NR15A

Information - Help 
ID = 14552
       
Country:
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to NR15A = CV1152 = 7404A
Predecessor Tubes NR15   CV1151  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Military and/or Government
Filament Vf 3.8 Volts / If 0.1 Ampere / Direct / Battery =
Description

Improved NR15 with anode impedance reduced from 20 to 6 kohms and anode current raised from 1.6 to 4.5 mA. British Admiralty Pattern 7404A

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Original-techn. papers.   
 
tubenr15a.jpg
NR15A: Mine colletion
Júlio Branco

More ...
 
pm3_1.png
NR15A: Manufacturer's Literature
Emilio Ciardiello

 
cv1152nr15a_1_1.png
NR15A: Manufacturer's Literature
Emilio Ciardiello

More ...

from Just Qvigstad


Forum contributions about this tube
NR15A
Threads: 1 | Posts: 1
Hits: 1664     Replies: 0
NR15A (NR15A)
Júlio Branco
22.Feb.07
  1

The NR15A is a British Navy triode receiving valve. Introduced in 1924 it was the first naval valve to have an oxide coated filament. This valve looks to have been made by the Azide process.

The photograph is essentially an MOV type L410 manufactured during the mid to late 1930s. Although the Azide process was essentially obsolete by this time it was used occasionally, and British Navy specifications may have remained unchanged for years after the technology altered.

This example dates from 1936 by which time it was known as the 'Lord Louis' valve in honour of the improvements Lord Louis Mountbatten is reported to have suggested.
The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 85 mm tall.

Made &Patentead in England

 

Best Regardes

Júlio Branco

 

Edit:
Changed it from "other language" to English.

 
NR15A
End of forum contributions about this tube

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