The EF184 is a purpose designed high gain frame grid pentode. The EF184 superseded the ubiquitous EF80. The amplification factor 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.

Electrode construction is of the frame grid pattern.

The thin glass tube envelope is 20 mm in diameter and excluding B9A base pins, is 51 mm long. The electrode assembly is 13 mm top to bottom.

 
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 datasheet

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This exhibit was last updated on 02 December 2007 {find valves by name}