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EL33

Sensibly equivalent to:
6AG6G 6M6G BVA266 CV2938 KT61 N147 PP6BG
See also:
Mullard Valves for Domestic Receivers Advert
    
Extras ▼

 

The EL33 audio output valve is the little brother of the 25 Watt EL37 with which it shares pin connections. Mullard describe this valve as a high sensitivity output pentode for use in AC mains equipment. The EL33 could be used in push pull to deliver 8 Watts, but the normal use was in domestic radio receivers as a single ended stage.
The internal coating obscures the inner detail.
There are two top mica sheets. The visible one has 'fingers' to grip the inside of the envelope. Blow the visible one is the mica that hold the electrodes. with a magnifying glass it can be seen that the control grid has heat radiating fins attached to the top of the supports. This exhibit has been cleaned but the photograph shows the remaining dirt.
The classic envelope is 44 mm in diameter and, excluding the IO base pins, is 109 mm tall.
References: Data-sheet, 1040 & 1043. Type EL33 was first introduced in 1938.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
6.3
0.9
250
250
-6
36
4
50,000
9
4.5
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 08, 2020.
shape:classic construction:pinch type:pentode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2 pin:5.g1 pin:6.- pin:7.h pin:8.k
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