This exhibit is a Ferranti D4 triode from the 1930's.

The balloon envelope is 44 mm in diameter and, excluding the B5 base pins, is 100 mm tall.

 
Pin Connections

B5	1	2	3	4	5
	a	g1	h	h	k

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	0.65	250	-4.5	6.5	11,500	3.5

This exhibit was last updated on 03 January 2008