The UCH81 is a triode oscillator and heptode mixer for use as a frequency changer in superhet receivers.

The 100 mA heater is designed for universal mains sets, and this is why the anode voltage is 200 maximum.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 58 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g2,g4	g1	k,g5,s	h	h	a(h)	g3	a(t)	g1(t)

 
Absolute Maximum Operating Conditions

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	19.0	0.1	200	119	-2.6	3.7	8.1	1.0M	0.78

Triode	Va	Vg	mAa
	100	0.0	13.5

Thanks to Frank Philipse for supplying the above datasheet

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