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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 - Frame-grid valves for TV No. 1 - Frame-grid valves for TV No. 4 - Frame-grid valves for TV No. 6 - Frame-grid valves for TV No. 7
    
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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 The EF184 superseded the ubiquitous EF80.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.
In 1969 Mullard describe the valve as: A frame-grid 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. Mullard quote operation at 40 MHz.
The outer screen with the two part anode within. The small active anode plates are formed as one with a strap between them.
The heater wire is formed from an insulated coil and passes through the cathode as a twisted and inverted hairpin.
The thin glass tube envelope is 20 mm in diameter and excluding B9A base pins, is 53 mm tall.
References: Data-sheet, 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
PDF scanned from an original document held by the museum
Updated April 10, 2021.
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