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GZ32, 5AQ4, CV593, CV2748, 52KU, 5V4G, GZ30, RECTIFIER, OCTAL

Today, let's see if we can get a summary of the GZ32 story. Let’s start with the 5V4, an older configuration of the GZ32, first introduced in 1937 rigid electrode structure. The Mullard 5V4G is a full wave rectifier with a rigid electrode cage and a maximum rectified output of 175 mA. The maximum recommended reservoir capacitor for the 5V4G is 40 µF and the minimum recommended series resistance to limit peak current flow is 100 Ohms.

Another variant is the 52KU which is the Cossor nomenclature for the GZ32 and is just the same as it’s a medium power biphasic HT rectifier designed for use in audio power amplifiers, small radio transmitters or industrial equipment. The maximum recommended reservoir capacitance for the 52KU is 32 µF and the minimum recommended series resistance to limit peak current flow is 75 Ohms.

The Mullard GZ32, first seen in 1939, is a medium power biphasic HT rectifier designed for general purpose use. The maximum recommended reservoir capacitance is 60 µF and the minimum recommended series resistance to limit current is 150 Ohms.

For all of these pin compatible and parameter equivalent devices, the glass versions are all octal based ST envelope types with an approximate envelope diameter of 40mm and a height excluding IO base pins of approximately 100mm

These devices are used in numerous classic valve hifi and guitar amplifiers as well as current devices too.


GZ32

5V4G


 

GZ32, MULLARD, BLACK BASE, SMUDGED WHITE OLD SHIELD PRINT

GZ32, MULLARD, BLACK BASE, SMUDGED WHITE OLD SHIELD PRINT
GZ32, UNKNOWN MANUFACTURER, SMUDGED WHITE CARTOUCHE PRINT, BLACK BASE,

GZ32, UNKNOWN MANUFACTURER, SMUDGED WHITE CARTOUCHE PRINT, BLACK BASE,
5V4G, BRIMAR, BLACK BASE, ORANGE BASE PRINT

5V4G, BRIMAR, BLACK BASE, ORANGE BASE PRINT
MULLARD, GZ32, NEW BOXED, JUNE 1966 BLACKBURN PRODUCTION, CV593

MULLARD, GZ32, NEW BOXED, JUNE 1966 BLACKBURN PRODUCTION, CV593
GZ32, MULLARD, BLACK BASE, FACTORY CODE, 1358 G3, FLEETWOOD, JANUARY 1955 MANUFACTURE

GZ32, MULLARD, BLACK BASE, FACTORY CODE, 1358 G3, FLEETWOOD, JANUARY 1955 MANUFACTURE
CV729, MIL SPEC, 5V4G, BRIMAR, BRIMSDOWN, AUGUST 1951 PRODUCTION, ORANGE BASE PRINTASE,

CV729, MIL SPEC, 5V4G, BRIMAR, BRIMSDOWN, AUGUST 1951 PRODUCTION, ORANGE BASE PRINTASE,
5V4G, RCA, BLACK BASE, SILVER BASE PRINT, JUNE 1956 MANUFACTURE

5V4G, RCA, BLACK BASE, SILVER BASE PRINT, JUNE 1956 MANUFACTURE
5V4G, BRIMAR, BLACK BASE, SILVER BASE PRINT

5V4G, BRIMAR, BLACK BASE, SILVER BASE PRINT
5V4G, MULLARD, BLACK BASE, SG1 B9I, SEPTEMBER 1959 BLACKBURN PRODUCTION

5V4G, MULLARD, BLACK BASE, SG1 B9I, SEPTEMBER 1959 BLACKBURN PRODUCTION
5V3, LEWIS & KAUFMAN, LOS GATOS, ST ENVELOPE, 5V3, RECTIFIER, NIB

5V3, LEWIS & KAUFMAN, LOS GATOS, ST ENVELOPE, 5V3, RECTIFIER, NIB
5V4G BRIMAR ORANGE BASE PRINT MATCHED PAIR

5V4G BRIMAR ORANGE BASE PRINT MATCHED PAIR
GZ32 PINNACLE (FIVRE)

GZ32 PINNACLE (FIVRE)
5V4G RCA JAN BLACK BASE SILVER BASE PRINT

5V4G RCA JAN BLACK BASE SILVER BASE PRINT
5V4G BRIMAR BLACK BASE SILVER BASE PRINT

5V4G BRIMAR BLACK BASE SILVER BASE PRINT
5V4G BRIMAR BLACK BASE

5V4G BRIMAR BLACK BASE