The D77 is the Marconi equivalent of the Mullard EB91, and consists of two separate signal diodes in the envelope.

The diodes were designed for vision and sound detection in television receivers. Additionally they are recommended for limiting and DC restoration.

The MWT logo.

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
	k(1)	a(2)	h	h	k(2)	s	a(1)

 
Absolute Maximum Operating Conditions

Diode	Vh	Ah	Va	mAa
	6.3	0.3	150	9

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 05 July 2007 {find valves by name}