The EAC91 is a miniature diode triode. The diode is a separate valve to the triode and can be operated in a separate circuit.

Mullard describe this valve as intended for service as an oscillator triode for use as a frequency changer (mixer). The sample circuit given by Mullard uses the diode as the non linear mixer element and rates the design as suitable for UHF use up to 300 MHz.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 45 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	ad	kd	h	h	g1	g2	k

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.3	200	-3.8	7.5	12.8k	2.8

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 10 June 2007 {find valves by name}