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N78

Sensibly equivalent to:
6BJ5 CV3711 CV4062
    
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The N78 is a 1953 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.
Emitron is an export trade name of GEC/M-OV.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 60 mm tall.
References: Datasheet & 1040. Type N78 was first introduced in 1952.

 

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 August 06, 2016.
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