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EF184

Sensibly equivalent to:
6EJ7 6F30 CV5810
See also:
Amplification and Valve Characteristics - Television RF Valve Development - Valves and their Habits - Frame Grid Valves
    
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The EF184 is a purpose designed high gain frame grid pentode. The EF184 superseded the ubiquitous EF80. The mutual conductance is 15.6 and the closely related (pin compatible) variable μ pentode EF183 has a μ of 12.5.
The Ef184 is a sharp cut-off pentode for use as an IF amplifier in television receivers. This implies a relatively wide band function at about 33 MHz. The high mutual conductance was important for wide band width amplifiers.
The the outer screen is made of solid sheet with holes punched in it. Other EF184 exhibits use an expanded mesh screen.
Here the outer wire grids can be seen including the copper supports of the screen grid.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 54 mm tall.
References: Datasheet, 3002 & 1040. Type EF184 was first introduced in 1960.

 

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
170
170
-2
10
4.1
0.33M
15.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 04, 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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