GZ32 5AQ4 CV593 52KU 5V4G 5Z4G GZ30 RECTIFIER VARIOUS MANUFACTURERS

Manufacturers: Cossor , Ediswan , Ferranti , Mazda , Mullard , Raytheon , RCA

Here we can put a little ‘meat’ on the GZ32 story. Let’s start with the 5V4, an older configuration of the GZ32, first introduced in 1937 and to my mind better sounding, no doubt due to it's much more rigid electrode structure. The Mullard 5V4G is a full wave rectifier with 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 tasty morsel 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 or modest 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.

The 5Z4G is a full wave rectifier is a medium power biphasic HT rectifier designed for duty in circuitry where valve cathodes had a high signal loading and hence needed to 'float' at voltages well below that of the chassis. Designed to supply a power loading of up to 50W, this device was made by many other manufacturers than it’s inventor, RCA.

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 is used in numerous classic valve hifi and guitar amplifiers and in such diverse exotica as the: -

Cary SLA-70A/B amplifier

Modwright Transporter

Matcheless amplifier

QUAD II monoblock,

 

 

Picture of BRIMAR CV729 MIL SPEC BROWN BASE 5V4G
BRIMAR CV729 MIL SPEC BROWN BASE 5V4G
On offer we have a Brimar CV729 5V4G rectifier valve. The classic ST envelope is tight to the brown micanol base which shows perfect black print. The device tests as 100% emissive for each diode section using our AVO VCM 163.
Stock Code: y37
Availability: 1 in stock
Delivery date: 1 week
£35.00
Picture of BRIMAR BLACK BASE 5V4G
BRIMAR BLACK BASE 5V4G
On offer we have a Brimar 5V4G rectifier valve. The classic ST envelope is tight to the black micanol base which shows perfect white print. The device tests as 100% emissive for each diode section using our AVO VCM 163.
Stock Code: y66
Availability: 1 in stock
Delivery date: 1 week
£35.00
Picture of MULLARD GZ32 YELLOW PRINT
MULLARD GZ32 YELLOW PRINT
On offer we have a Mullard yellow print GZ32 rectifier valve, the classic ST envelope is tight to the black micanol base. The device tests as 100% emissive for each diode section using our AVO VCM 163.
Stock Code: c127
Availability: 1 in stock
Delivery date: 1 week
£42.00
METAL ENVELOPE 5Z4 NEW EX MIL STOCK
Availability: 4 in stock
Delivery date: 1 week
£8.00
Picture of COSSOR 5Z4G WHITE PRINT BLACK BASE
COSSOR 5Z4G WHITE PRINT BLACK BASE
This valve shows excellent bright getter and has the inverted getter plate situated down by the pinch. It carries the Cossor brand in white ink. However, more importantly it tests as EXCELLENT using my Avo VCM163 valve tester. This exquisite device has a black low loss micanol base which is tight to the envelope and the pins are clean, straight and uncorroded. Device specification 60mA delivery for both diode sections. So you can see we have 100% emission from this venerable beauty.
Stock Code: y38
Availability: 1 in stock
Delivery date: 1 week
£32.00
Picture of COSSOR YELLOW PRINT 5Z4GT
COSSOR YELLOW PRINT 5Z4GT
On offer we have a Cossor yellow print 5Z4GT rectifier valve. The envelope is tight to the black micanol base.. The device tests as 100% emissive for each diode section using our AVO VCM 163.
Stock Code: 890
Availability: 1 in stock
Delivery date: 1 week
£15.00
Picture of GZ32 ST SHAPED, THOUGHT TO BE FIVRE FRANCE MANUFACTURE
GZ32 ST SHAPED, THOUGHT TO BE FIVRE FRANCE MANUFACTURE
On offer we have a niceGZ32 rectifier valve carrying no factory etched code - so not a Mullard device. Not sure who the manufacturer is but the electrode cage is remeniscent of Fivre production. The classic ST envelope is tight to the black micanol base. The device tests as 100% emissive for each diode section using our AVO VCM 163. A nice reasonably priced device.
Stock Code: g14
Availability: 1 in stock
Delivery date: 1 week
£22.00
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