The standard Mullard naming convention would name this UHF pentode as EF180, but for special quality valves, such as this, the numbers are presented after the indication of the heater. E = 6.3 volts.

Mullard describe the E180F as a high slope RF pentode primarily intended for use in wideband amplifiers in telephone carrier systems, radar equipment and measuring equipment.

It can be seen that in this miniature envelope is an even smaller valve, this very small size helps to reduce inter electrode capacitances and thereby raises the maximum usable frequency that the device can operate at.

These valves would be used for the front end amplification stage of high quality receivers up to the UHF region of the spectrum.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 38 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	k	g1	k	h	h	k	a	g3-s	g2

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	190	160	-1	13	3.3	35K	16.5

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 10 June 2007 {find valves by name}