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EFF51

 
    
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The EFF51 has a designation for a double pentode and was introduced in 1941. The two cathodes are strapped together and connected internally to G3. This leaves sufficient pins for the rest of the electrodes.
This valve was used as a voltage amplifier in VHF television receivers in the late 1940's.
The wide glass tube envelope is 30 mm in diameter, and excluding the B9G base pins, is 60 mm tall.
References: Datasheet & 3002. Type EFF51 was first introduced in 1941.

 

Pin Connections
B9G
1
2
3
4
5
6
7
8
9
h
a(1)
g2(1)
g1(1)
k(1),k(2),g3
g1(2)
g2(2)
a(2)
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
mAa
6.3
0.75
300
15
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 02, 2013.
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