The EF183 is a high gain variable μ RF amplifier pentode. It is a 1960s design and superseded the EF85.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.

In 1969 Mullard describe the EF183 as: a frame-grid variable-mu RF pentode for use as an automatic gain controlled IF amplifier in television receivers. The heater is suitable for series or parallel operation by AC or DC.

The valve performance figures are given at 40 MHz and the normal TV IF frequency was around 33 MHz.

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

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