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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 UK RAF receiving pentode valve. The VR prefix in the type designation stands for Valve Receiving.
The valve in civilian name is an EF36 and this exhibit looks like a Mullard device from the size and shape of the envelope. Unlike VR56 this exhibit retains the full melallised paint screen coating.
This valve design was obsolete by the 1960s.
The reverse of the envelope carries the AM and crown logo of the UK Air Ministry.
The classic envelope is 30 mm in diameter and, excluding the IO base pins, is 85 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 October 21, 2016.
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