The VR99 is a triode hexode, and the VR denotes that it was designated for use with the RAF as a receiver device.

The triode was designed for local oscillator use and an injection voltage of 10 V peak to peak was produced. The hexode mixer took the signal into the top cap grid, thus maintaining the greatest separation between grid and anode circuits.

The classic envelope is 37 mm in diameter and, excluding the IO base pins, is 94 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	m	h	a	g2,g4	g(t),g3	a(t)	h	k	g1

 
Absolute Maximum Operating Conditions

Hexode	Vh	Ah	Va	Vs	Vg	mAa	ra	gm
	6.3	0.3	250	100	-3	1.75	2.5M	0.225

Triode	Va	mAa
	100	4.75

This exhibit was last updated on 21 January 2003