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CV173

Sensibly equivalent to:
DDR2 EF55
    
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The CV173 is the UK government type number for the commercial EF55 pentode the prototype was known as the DDR2. This is physically the big brother of the EF50 with which it shares common base connections.
The CV173 is a single ended RF pentode with very high mutual conductance and a sharp cut-off. It was designed for video frequency use, probably in RADAR service.
It is an early all glass constructed valve with equi-spaced pins and a spigot for location into the valve holder.
The current rating places it as a power valve but it is designated for amplifier service with a medium anode impedance.
The wide glass tube envelope is 32 mm in diameter, and excluding the B9G base pins is 80 mm tall.
References: Datasheet.

 

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
1.0
250
250
-4.5
40
5.5
55k
12.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 04, 2013.
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