articles
 
collections
 
timeline
Mullard

EB91


G8LSD Valve Collection
equivalents
 
new
 
   


home
Sensibly equivalent to:- 6AL5 - 6D2 - CV140 - D77 - DD6 - M8212 - D152 - EAA91
 
See also:
Valves and their Habits
 
This exhibit was last updated on 05 January 2013
Become a friend or
with PayPal.

The EB91 is a double signal diode. Mullard separate rectifier diodes and signal diodes in their naming convention. The full wave rectifier being given the letter Z, the twin diodes the letter B.
The EB91 dates from 1949 but the American 6AL5 was produced in 1946. Prior to the EB91 there was the EB41 all glass valve and the EB34.
The two valves are completely separate flat structures separated by a plate screen. This clearly shows the signal usage, where it is important to keep RF isolation.
Mullard designed these diodes for vision and sound detection. Additionally they are recommended for limiting and DC restoration. Each section is internally screened.
The most common fault with the EB91 design is heater to cathode leakage.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Datasheet 1040 & 3002. Type EB91 was first introduced in 1949.
 
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
More