The X148 triode heptode was designed for frequency changer use in radio receivers. The 'x' in the type designation indicates a frequency changer.

The wide glass tube envelope is 28 mm in diameter and, excluding the B8B base pins, is 54 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

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	100	-2	1.7	2.2	2.0M	2.0

Triode	Va	mAa
	150	5.0

This exhibit was last updated on 21 January 2003