Sensibly equivalent¶ to:
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.
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.
Our other Brimar 5Z4G has a different anode construction to this exhibit.
The anode sections are side by side and the fron to back dimension is small compared to the width with the cooling fin. The active anode space is cylindrical.
The two cathode tubes can be seen at the centre with the insulated heaters emerging from below. The working cylinder of the anode is a small diameter and the rest of the anode sheets are the fixings and cooling fins.
The classic envelope is 44 mm in diameter and, excluding the IO base pins, is 104 mm tall.
References: Datasheet & 1043. Type 5Z4G was first introduced in 1940.
Absolute Maximum Operating Conditions¶
Updated December06, 2012.