The UF41 from Mullard is a vari-mu amplifier pentode. Use was for AGC controlled RF and IF amplification in superhet receivers.

The thin glass tube envelope is 19 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	h

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	12.6	0.1	170	100	-2.5	6.0	1.75	0.9M	2.3

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 12 June 2007 {find valves by name}