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EL34

Sensibly equivalent to:
6CA7 CV1741 KT77
    
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The EL34 is a much loved audio power valve with an anode dissipation of 25 Watts. In this example we see that other manufacturers produced copies of the Mullard classic. (See EL34 for the original.)
Looking into the anode cavity the three wire grids can be seen, with the control grid of fine pitch close to the central cathode and the final suppressor grid appearing as a lazy spiral of wide spacing.
The wide glass tube envelope is 34 mm in diameter and excluding IO base pins the valve is 95 mm high.
References: Datasheet & 1040. Type EL34 was first introduced in 1954.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAs
gm
Vg
Pdiss
Pout
D
6.3
1.5
800
400
-39,mAa_91
19
11.0
66
25W
100W
5%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2014.
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