The X81 is a triode hexode mixer for use in communications receivers. The triode oscillator is designed to produce 10 volts pk-pk to drive the hexode mixer. The all glass envelope is protected by an all encompassing aluminium screening can that also serves to hold the spigot carrying base in place.

The Osram paper label is on the opposite side to the printed type designation.

The wide glass tube envelope is 32 mm in diameter, and excluding the B8B base pins is 59 mm tall.

 
Pin Connections

B8B	1	2	3	4	5	6	7	8
	h	a	a(t)	g1(t),g3	g2,g4	g1	k	h

 
Absolute Maximum Operating Conditions

Hexode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	100	-2.0	3.0	2.4	1.0M	0.65

Triode	Va	Vg	mAa
	100	-	3.6

This exhibit was last updated on 06 January 2007