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Z90

Sensibly equivalent to:
63SPT ARP35 CV1091 CV1578 EF50 VR91
See also:
The Famous EF50 of WWII
    
Extras ▼

 

The Z90 produced by M-OV is another manufacturers implementation of the EF50. The design was used by many devices used by the UK government and subject to a CV specification and many valve makers produced valves to the specification. Government procurement could not rely on a sole supplier.
Post war the EF50 design was used in television receiver designs for the restarted television service, thus commercial production was valuable for the valve makers.
The screening can has helical scratches and this suggests that the valve has been used with a screw locking base as developed by the RAF. See EF50 for a picture of the base.
The plain aluminium can carries the Osram logo of M-OV on the reverse.
The wide metal tube envelope is 33 mm in diameter and, excluding the B9A base pins, is 59 mm tall.
References: Datasheet & 1043.

 

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 December03, 2012.
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