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5Z4G

Sensibly equivalent to:
52KU AU13 CV1863 GZ32 R52 U50
    
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This exhibit is a Brimar 5Z4G full wave rectifier. Professional equipment, including radar, etc., sometimes required circuits in which valve cathodes carried large signals and had to 'float' at voltages well below that of the chassis. Glass-envelope '-G' versions of common types were therefore required. The original metal envelope 5Z4 had to have the outer envelope at below cathode potential to prevent them acting as an anode so were at a disadvantage in these applications.
Our other 5Z4G has a different anode structure.
Initially, these '-G' versions were larger than their metal counterparts but with the introduction of 'pinchless', slimline '-GT' types 5Z4GT the advantage of the compact metal types was reduced to the point where RCA decided to phase out production in favour of (slightly cheaper) all-glass types.
Designed to supply equipment of up to 40 Watts total power, this rectifier was made by several manufacturers. This suggests a very popular type, and one that found use in military equipment during WWII.
The normal pattern of a central tube cathode with the anode extended sideways to increase the area available to radiate away the heat.
A closer view of one of the rectifier sections.
The classic envelope is 45 mm in diameter and, excluding the IO base pins, is 106 mm tall.
References: Datasheet, 1043 & 1040. Type 5Z4G was first introduced in 1940.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
nc
a(2)
nc
a(1)
nc
h,k

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
5.0
2.0
350
125
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December06, 2012.
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