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EF183

Sensibly equivalent to:
6EH7 6F29 CV5831
See also:
Frame Grid Valves
    
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The EF183 is a high gain amplifier pentode. It was used for RF amplification in television receivers.
The construction inside the mesh screen is of a flat cathode surrounded by flat grids, and is known as frame grid construction. On the sturdy support frame the grid wire is wound at about 50% of the wire's breaking strain. This gives a closely defined plane that the grid wire occupies. With such precision the grid to cathode separation can be extremely small and thus generate a high gm figure. The anode consists of two plates connected by straps on either side of the cathode and separated by 4 mm.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 52 mm tall.
References: Datasheet & 1040. Type EF183 was first introduced in 1959.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
k
g1
k
h
h
s
a
g2
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
200
90
-2
12
4.5
0.5M
12.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 22, 2013.
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