The VR in the VR38, tells us that this was an RAF designation prior to WW2. The valve, on a B5 base, is an amplifier triode. We have no details as to whether this is an audio or RF valve.

The opacity of the envelope veils the internal structure.

The classic envelope is 42 mm in diameter and, excluding the B5 base pins, is 91 mm tall.

 
Pin Connections

B5	1	2	3	4	5
	a	g	h	h	k

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	250	-8	8	8,000	2.5

This exhibit was last updated on 06 February 2003