The 1R5 miniature heptode frequency changer was designed for dry battery operation. The exhibit is in the original box that is marked JRC1R5 US Army May 1945.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 46 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	f-	a	g2,g4	g1	f-	g3	f+

 
Absolute Maximum Operating Conditions

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	1.4	0.05	90	45	-0	0.8	1.9	0.8M	0.25

Thanks to Frank Philipse for supplying the above datasheet

More

This exhibit was last updated on 02 December 2007 {find valves by name}