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63SPT

Sensibly equivalent to:
ARP35 CV1091 CV1578 EF50 POVT207 VR91 VT-250 Z90
See also:
The Famous EF50 of WWII
    
Extras ▼

 

The 63SPT was A C Cossor's type designation number for the EF50s that it made. The valve was so important during WWII that several manufacturers were involved although the design was a breakthrough for Philips in The Netherlands.
The wide metal tube envelope is 32 mm in diameter and, excluding the B9A base pins, is 60 mm tall.
References: Datasheet & 1040. Type 63SPT 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 December05, 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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