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EF39

Sensibly equivalent to:
ARP31 ARP34 BVA246 CV1053 CV1464 CV5110 OM6 VR53 W147
    
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The EF39 was described by Mullard as a variable-mu RF pentode, with sliding screen characteristics, for use as a controlled RF or IF amplifier. The EF9 is electrically identical to the EF39 but is on a Ct8 base. The frequency range of operation would be up to 30 MHz.
The Cossor OM6 is directly equal.
The classic envelope is 29 mm in diameter and excluding the IO base pins it is 84 mm long.
References: Datasheet, 1040 & 1043. Type EF39 was first introduced in 1939.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
250
250
-2.5
6
1.7
1.5M
2.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 30, 2014.
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