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VR56

Sensibly equivalent to:
CV1056 EF36 NR49 OM5
See also:
Evolution from EF36 & EF37 to EF37A - CV1056 short entry
    
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The VR56 is a pre-WWII military receiving pentode valve. The VR prefix in the type designation stands for Valve Receiving. This exhibit was made in Canada by Rogers and also has the old stores code of 10E/11402 printed on the screening paint.
The valve in civilian name is an EF36. This valve was obsolete by the 1960s, and our data sheets show that the EF36 had identical characteristics and pin connections to the EF37 and EF37A. These were all high gain low current intermediate frequency amplifiers in superhet receivers and all featured external metalisation. With their low capacitances they would be useful at radio frequencies as well as IF.
The Rogers name and logo.
The A M and Crown for the Uk Air ministry.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 82 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 December23, 2016.
shape:wide.glass.tube 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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