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EL50

Sensibly equivalent to:
CV2941
    
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The EL50 is an audio output pentode. It is not listed in the 1949 Mullard data book but other 1930s valves are listed. This suggests that this was a Philips design for the Europe market that was badged as Mullard for UK sales but that was not popular or soon replaced.
Above can be seen the Ct8 base and the method of connecting the lead out wires to the contacts.
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 classic envelope is 43 mm in diameter and, excluding the Ct8 base pins, is 122 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 February 22, 2013.
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