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EL38

Sensibly equivalent to:
6CN6 CV450
See also:
Mullard Transistor Controlled PSU Advert - Mullard EL38 & EBC33 Advert - Mullard EF42, ECC34 & EL38 Advert - CV450 short entry
    
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The EL38 was designed, in the late 1940s, as a television line output stage valve. In the early days of CRT based television the tubes could have been either electrostatic or magnetic deflection. The EHT supplies were mainly derived from special mains transformers and ran at about 10 - 14 kV. Thus the line output valve was not as heavily stressed as later types had to be.
The EL38 was designed to withstand a positive anode surge of 8,000 Volts and in addition to the 25 Watt anode dissipation the screen grid was wound to withstand a dissipation of 8 Watts.
The cathode is oval, and the ceramic insulators are clearly visible. The control grid is wound with fine gold plated wire and is supported on copper rods to aid heat conduction. At the top of the grid support rods are two grey radiator fins. The second grid is of increased pitch but close to the control grid. The outer suppressor grid is a lazy spiral of bright wire not far from the inside of the anode cavity.
The classic envelope is 41 mm in diameter and, excluding the IO base pins, is 120 mm tall.
References: Datasheet & 1040. Type EL38 was first introduced in 1946.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
mAa
mAs
Pdiss
6.3
1.4
300
250
64
18
25W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 06, 2015.
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