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EL41


G8LSD Valve Collection
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Sensibly equivalent to:- 6CK5 - CV3889 - N150 - 67PT
 
 
 
This exhibit was last updated on 29 January 2013
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The EL41 is an early all glass output pentode. Mullard describe the EL41 as an output pentode rated for 9 watts anode dissipation, and intended primarily for use in AC mains operated equipment. They state that the EL41 should only be used with self-bias or semi-automatic bias.
Unlike the first B8A valves that had a metal base cover with locating spigot, this valve has a wider base to the envelope and a locating pip moulded into the glass. It indeed represents the transition point to the final all glass valve. The pins are still equi-spaced in the base and this soon gave way to the B9A and B7G styles that did not require a locating spigot.
The thin glass tube envelope is 20 mm in diameter and, excluding the B8A base pins, is 65 mm tall.
References: Datasheet & 1040. Type EL41 was first introduced in 1947.
 
Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
k
k,g3
g2
g1
k
h
 
Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pdiss
Pout
D
6.3
0.7
250
250
-7
36
5.2
40,000
10
9W
4.2W
10%

Thanks to Frank Philipse for supplying the above PDF datasheet
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