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EF183

Sensibly equivalent to:
6EH7 6F29 CV5831
See also:
Valves and their Habits - Frame Grid Valves
    
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The EF183 is a high gain variable μ RF amplifier pentode. It is a late 1950s design and superseded the EF85. The EF184 was the straight version of the design and replaced the EF80. All four valves have the same pin connections.
The screen from the base to the lower mica disc shields the anode connection.
Through the outer mesh screen can be seen the black strap that ties the two halves of the anode together. At full size one can see the open winding of the suppressor grid and the close wound screen grid. But looking closer the flat fine wires of the frame grid can be seen.
A microscope image of the control grid.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 53 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 19, 2019.
shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.k pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.s pin:7.a pin:8.g2 pin:9.g3
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