▼ Menu

QD77

Sensibly equivalent to:
EB91
    
Extras ▼

 

The D77 is the Marconi equivalent of the Mullard EB91, and consists of two separate signal diodes in the envelope.
The QD77 is the special quality version of this valve type.
The diodes were designed for vision and sound detection in television receivers. Additionally they are recommended for limiting and DC restoration.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 44 mm tall.
References: Datasheet & 1040.

 

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 PDF datasheet.
Updated January 05, 2013.
Return to Main Index