Mullard describe the EF41 as a variable μ RF pentode for use as an RF or IF amplifier.

In the literature Mullard state that although pins 3, 4 and 7 are internally connected together, it is recommended that the external cathode connection be made to pin 7 as this point offers the lowest connection inductance.

The thin glass tube envelope is 21 mm in diameter and, excluding the B8A base pins, is 53 mm tall.

 
Pin Connections

B8A	1	2	3	4	5	6	7	8
	h	a	ic	ic	g2	g1	k,g3	h

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	mAa	mAs	gm
	6.3	0.2	250	6.0	1.7	2.2

Thanks to Frank Philipse for supplying the above datasheet

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