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EL50

Sensibly equivalent to:
CV2941
    
Extras ▼

 

The EL50 is an audio output pentode. It is not listed in the 1949 Mullard data book but other 1930s valves are listed.
The other designation on the glass 10E/131 is a UK government stores code and so clearly this was used by one or another government department. It was later given the CV number of CV2941.
The first operating conditions given are for single ended service. The cathode resistor would be 175 Ohms and the anode load 3,500 Ohms.
For push pull service in class AB1 a pair of EL50s could produce 28.5 Watts. The grid to grid input signal needed to be 45 Volts peak to peak. The cathode resistor 165 Ohms and the load from anode to anode 6,500 Ohms.
The top of the valve showing the three wire grids and shaped cathode tube. The control grid has cooling fins attached.
Here the oxide coating on the cathode is visible.
The classic envelope is 44 mm in diameter and, excluding the Ct8 base pins, is 125 mm tall.
References: Datasheet, 1040 & 1043. Type EL50 was first introduced in 1939.

 

Pin Connections
Ct8
1
2
3
4
5
6
7
8
tc
-
h
h
k
g3
g1
g2
-
a

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
6.3
1.35
250
275
-14.0
72.0
8.0
22,000
8.5
8.8
10

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
mAa
mAs
Pout
D
6.3
1.35
375
275
62
9.0
28.5
2.25
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 21, 2015.
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