The 2A7 is an American style pentagrid frequency changer. The signal is introduced via the top cap to g4.

The classic envelope is 37 mm in diameter and, excluding the UX7 base pins, is 98 mm tall.

 
Pin Connections

UX7	1	2	3	4	5	6	7	tc
	h	a	g3,g5	g2	g1	k	h	g4

 
Absolute Maximum Operating Conditions

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra
	2.5	0.8	250	100	-3	3.5	2.2	0.36M

Thanks to Frank Philipse for supplying the above datasheet

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