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EL33

Sensibly equivalent to:
6AG6G 6M6G BVA266 CV2938 KT61 N147 PP6BG
See also:
Mullard Valves for Domestic Receivers Advert
    
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The EL33 audio output valve is the little brother of the 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 top mica with fingers gripping the shoulder of the envelope. Below the top mica is the mica that holds the tops of the electrodes. The coating obscures the rest of the structure.
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. See also 1938 adverts.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g1
nc
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 January 30, 2024.
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