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EF50

Sensibly equivalent to:
63SPT ARP35 CV1091 CV1578 POVT207 VR91 VT-250 Z90
See also:
The Famous EF50 of WWII - Television RF Valve Development - Some Important British Valves - Pye B18T AC/DC Television Chassis - A General Purpose EF50 Circuit
    
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The EF50 was one of the 'wonder' valves of WWII making possible high frequency IF strips (45 MHz) for Radar. It was also a relatively short lived valve and was thus manufactured in vast quantities.
Here we have an example of one made by Tungsram.
The wide glass tube envelope is 30 mm in diameter, and excluding the B9G base pins is 60 mm tall.
References: Datasheet & 1040. Type EF50 was first introduced in 1939.

 

Pin Connections
B9G
1
2
3
4
5
6
7
8
9
h
g2
a
g3
s
k
g1
s
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
250
-2
10
3
1.0M
6.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December06, 2012.
shape:wide.glass.tube construction:all.glass type:pentode age:1930.1940 base:b9g heater:6.3v pins:9 pin:1.h pin:2.g2 pin:3.a pin:4.g3 pin:5.s pin:6.k pin:7.g1 pin:8.s pin:9.h
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