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EL3

 
See also:
Mullard Red 'E' Series Advert - Mullard EF8, ECH2, EBC3, EF9, EB4, EL3 & AZ3 Advert
    
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The EL3 is an audio output pentode from 1938. Ten years later the uprated version was the EL3N that was functionally equivalent to the EL33 that was fitted with a standard IO base cap.
The anode is oval in shape. The control grid is fitted with radiating fins at the top of the supports. The suppressor grid supports extend up to a secondary mica sheet that fits tight in the top of the envelope and holds the electrodes firm.
A closer view of the upper part of the anode and inner components. The cathode tube is oval but a slightly different profile to the anode. The g3 pitch is very wide.
The classic envelope is 43 mm in diameter and, including the Ct8 base pins is 114 mm tall.
References: Datasheet, 1040 & 1043. Type EL3 was first introduced in 1938.

 

Pin Connections
Ct8
1
2
3
4
5
6
7
8
-
h
h
k
-
g1
g2
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
Pout
6.3
0.9
250
-8.5
20
3,000
6.5
1.1W

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
Pout
6.3
0.9
250
250
-7
36
4.5
9.5
4.5W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 21, 2017.
shape:classic construction:pinch type:pentode age:1930.1940 base:ct8 heater:6.3v pins:8 pin:1.- pin:2.h pin:3.h pin:4.k pin:5.- pin:6.g1 pin:7.g2 pin:8.a
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