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CV3711

Sensibly equivalent to:
6BJ5 N78
    
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The CV3711 is an audio output pentode with a high mutual conductance, suggesting that full output can be obtained with a low input signal.
In class AB1 push pull a pair of valves can deliver 9 Watts at 4.5% distortion. If connected as triodes the pair can deliver 6.3 Watts at 1.6% distortion.
The commercial equivalent of this UK Government specification valve is N78.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins, is 63 mm tall.
References: Data-sheet & 1040. Type CV3711 was first introduced in 1953. See also 1953 adverts.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k,g3
h
h
a
ic
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
6.3
0.64
250
250
-5.5
36
5
40,000
10
4W
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 14, 2013.
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