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U78

Sensibly equivalent to:
6063 6X4 CV493 CV4005 EZ90
See also:
GEC CV4005 U78, CV4014 Z77 & CV4062 N78 Advert
    
Extras ▼

 

The U78 is a miniature HT full wave rectifier with two anodes around a common cathode assembly.
At 325-0-325 input to the rectifier this will give an HT rail higher than is required for most domestic receivers. Use for audio amplifiers and small transmitters is most probable, or driven at 250 volts for radio receivers.
See also 12X4 for the version with a 12 Volt heater.
The two anodes are identical and mounted in an X formation. The upper anode is mounted with the side legs pointing down and the lower anode has the legs vertically. In this way the maximum radiating area is fitted into the small envelope.
This image shows the face of one anode and the side of the other.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 58 mm tall.
References: Datasheet & 1040. Type U78 was first introduced in 1952.

 

Pin Connections
B7G
1
2
3
4
5
6
7
a(2)
-
h
h
-
a(1)
k

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
6.3
0.6
325
70
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 24, 2018.
shape:thin.glass.tube construction:all.glass type:rectifier.fw age:1950.1960 base:b7g heater:6.3v pins:7 pin:1.a(2) pin:2.- pin:3.h pin:4.h pin:5.- pin:6.a(1) pin:7.k
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