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CV3526

Sensibly equivalent to:
6BN5 EL85
    
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The CV3526 is the UK Government procurement designation for the EL85. The EL85 itself appears to be the little brother of the EL84 pentode. It is specified for single ended audio applications with a load resistance 9000Ω. This could be used in radio or television receivers it is also an RF amplifier up to 100 MHz.
This valve was supplied to the GPO and was, therefore, used in telephone repeaters. The low heater current and modest HT requirement makes it ideal for this application. It is possible to see the EL85 (CV3526) as a designed replacement for the older EL32 that the GPO used in large quantities.
The GPO batch sample lettering.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins the valve stands 59 mm high.
References: Datasheet & 1040. Type CV3526 was first introduced in 1954.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g1
g1
k
h
h
g3
a
g3
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
6.3
0.2
225
225
-10.8
26
41
90k
3.2
2.8W
12%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated May 26, 2019.
shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.g1 pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.g3 pin:7.a pin:8.g3 pin:9.g2
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