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NR49

Sensibly equivalent to:
CV1056 EF36 OM5 POVT201 VR56
See also:
Evolution from EF36 & EF37 to EF37A
    
Extras ▼

 

The NR49 is a pre-WWII UK RAF receiving pentode valve. The NR prefix in the type designation stands for Navy Receiving. The Admiralty specification is 1260 and unusually for a valve for the military the maker's name is present.
The valve in civilian name is an EF36.
The reverse is the Mullard gold coloured zinc loaded paint and the serial number 1445.
The classic envelope is 30 mm in diameter and, excluding the IO base pins, is 81 mm tall.
References: Datasheet & 1040.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2
g3
nc
h
k
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
100
-2
3
0.8
2.5M
1.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 13, 2019.
shape:classic construction:pinch type:pentode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2 pin:5.g3 pin:6.nc pin:7.h pin:8.k pin:tc.g1
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