The 13DHA exhibit is a double diode triode. The 200 mA heater suggests mains use in AC/DC sets. The double diode triode was extensively used in superhet receivers as signal detector, AGC rectifier and first audio amplifier stage.

The classic envelope is 43 mm in diameter and, excluding the B7 base pins, is 104 mm tall.

 
Pin Connections

B7	1	2	3	4	5	6	7	tc
	a(d2)	m	a(d1)	h	h	k	a	g1

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	13.0	0.2	250	-1.5	1.0	83,300	1.5

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 09 June 2007 {find valves by name}