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CV10709

Sensibly equivalent to:
PL82
    
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The CV10709 is a UK government code. It implies usage by some British Government or quasi-government organisation (eg. the NHS) and is intended to permit competitive procurement as a specification is issued for several manufacturers to built to. In 1941 when the CV (Common Valve) process was introduced each manufacturer made products for a specific type of application but rarely were the different products more than sensibly equivalent and so have security of supply and consistent performance the government issued a design specification that it invited manufacturers to tender for.
Post war the commercial competition took the BVA down the route of making Standard Valves where a specification was implemented by different makers by their own methods but performance met the standard.
This valve would normally be found in audio stages of television receivers. A pair used in push pull class AB1 would deliver 9 Watts at 4 % distortion. The peak to peak grid signal voltage would be 26 Volts and the shared anode load would be 4,000 Ohms.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.
References: Datasheet & 1040.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
16.5
0.3
170
170
-10.4
53
10
20,000
9.0
4W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 09, 2013.
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