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NR4C

Sensibly equivalent to:
R.4C
    
Extras ▼

 

This NR4C has lost its base, but the electrodes are still clearly seen within the envelope. The filament is a single strand running through the centre of the anode cylinder. Between the 9 mm diameter anode and the filament is a thick wire helical grid 3 mm in diameter.
The NR prefix indicates that it was made for the British Navy as a receiving valve. The number 4 indicates that this was a very early device used by the Navy.
The balloon envelope is 48 mm in diameter and, 66 mm tall.
Reference: 1003.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Updated April 25, 2013.
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