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5U4G U52 52KU CV575 CV1071 CV1575 GZ31 VU71 VALVE RECTIFIER VARIOUS MANUFACTURERS


octal based biphasic directly heated HT rectifier valve
Manufacturers: Brimar , GEC Valves , Osram , STC , RCA , Cossor
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The U52 is directly heated full wave rectifier with a rating of 500 Volts on the anodes. The U52 has a maximum reservoir capacitor rating of 16 µF and a minimum series resistance of 180 Ohms, capable of delivering 100 Watts of DC power. It would be used for all types of medium power equipment. . 

The 5U4G has ribbon filaments coated with oxide with the top of the filament extends beyond the top mica, their directly heated design and generous power rating means sag free HT+ is available instantaneously and with bags of reserve any application - even audio - could desire..

Their appearance is typified by the fat balluster shaped envelope and shaped micanol base ala KT66.

The classic envelope is 48 mm in diameter, and excluding the IO base pins, is 113 mm tall. Type U52 was first introduced in 1938.

As you can see, there are many variants of the U52 type but the GEC-Osram product is the most desired and well regarded both from an aesthetic and performance perspective.

 



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Picture of KEN-RAD VT-244 JAN 5U4G 5 RIB CHARCOAL ANODE
KEN-RAD VT-244 JAN 5U4G 5 RIB CHARCOAL ANODE

This beautiful Joint-Army-NAvy ex military device is ex equipment but gives a full emission test on our AVO VCM163. It has the scarce 5 ridged charcoal anode electrode cage and is a very very nice valve indeed - scarcely offeredd, keenly sought, well, here's one on offer today! 

Availability: 1 in stock

£65.00 (GBP)
Picture of CANADIAN WESTINGHOUSE RED PRINT AIR MINISTRY 110E/47 5U4G RED PRINT WW2
CANADIAN WESTINGHOUSE RED PRINT AIR MINISTRY 110E/47 5U4G RED PRINT WW2

This beautiful Air Ministry WW2 ex military device is ex equipment but gives a full emission test on our AVO VCM163. It has the smooth light charcoal anode electrode cage and is a very very nice valve indeed.  The envelope carries an etched 5U4G 110E/47 cartoughe and the base carries red inked printing in addition - a scarcely offered WW2 variant of this device, keenly sought, well, here's one on offer today! 

Availability: 1 in stock

£65.00 (GBP)
Picture of RCA SHORT FORM 5U4G 4 RIB ANODE RECTIFIER
RCA SHORT FORM 5U4G 4 RIB ANODE RECTIFIER

This RCA short form 5U4G valve shows excellent bright getter and tests as EXCELLENT using my Avo VCM163 valve tester. Device test data: Ia = 120.0mA for both diode sections

 

Device specification 120mA delivery for both diode sections. So you can see we have 100% emission from this venerable beauty. 


£17.50 (GBP)
Picture of RCA ST SHAPE 5U4G RECTIFIER SMOOTH CHARCOAL ANODE
RCA ST SHAPE 5U4G RECTIFIER SMOOTH CHARCOAL ANODE

This  RCA tall form ST envelope 5U4G valve shows excellent bright getter and tests as EXCELLENT using my Avo VCM163 valve tester. Device test data: Ia = 120.0mA for both diode sections

 

Device specification 120mA delivery for both diode sections. So you can see we have 100% emission from this venerable beauty. 

Availability: 1 in stock

£25.00 (GBP)
Picture of GE OWENSBOROUGH SHORT FORM 5U4GB
GE OWENSBOROUGH SHORT FORM 5U4GB

This GE short form 5U4G valve shows excellent bright getter and tests as EXCELLENT using my Avo VCM163 valve tester. Device test data: Ia = 120.0mA for both diode sections

 

Device specification 120mA delivery for both diode sections. So you can see we have 100% emission from this venerable beauty.
 

Availability: 1 in stock

£15.00 (GBP)
Picture of COSSOR 52KU MATCHED PAIR
COSSOR 52KU MATCHED PAIR
Quite a scarce pair of valves these, the 52KU - Cossor's iteration of the bulbous U52 and to me you get the best of both worlds as you have the balluster envelope coupled with the trademark parallelogram electrode cage and the swan neck getter ala 53KU.
 
This valve pair shows excellent bright getter with slight heat fringing and has the swan neck getter pan situated behind the parallelogram anode cages.  The valves carry white print Cossor markings and is Highgrove 1950s manufacture. . However, more importantly they test as EXCELLENT using my Avo VCM163 valve tester. These exquisite devices have good sharp getter, the classic balluster 53KU envelope shape and the trademark rounded BLACK low loss micanol base which are both very tight to the base and shows no evidence of reglueing - simply super.
 
Device test data: Ia = 120.0mA for both diode sections in each valve.
 

Device specification 120mA delivery for both diode sections. So you can see we have 100% emission from this pair of venerable beauties. 


£200.00 (GBP)
Picture of TUNG-SOL VT-244 5U4G SC545A FIVE RIB ANODE JAN PRODUCED RECTIFIER
TUNG-SOL VT-244 5U4G SC545A FIVE RIB ANODE JAN PRODUCED RECTIFIER

This beautiful Joint-Army-Navy ex military device is ex equipment but gives a full emission test on our AVO VCM163.  It has the scarce 5 ridged charcoal anode electrode cage  and is a very very nice valve indeed - scarcely offered, keenly sought, well, here's one on offer today! 

Availability: 1 in stock

£65.00 (GBP)
Picture of OSRAM CV575 AIR MINISTRY U52 HAMMERSMITH 1955 PRODUCTION BROWN BASE
OSRAM CV575 AIR MINISTRY U52 HAMMERSMITH 1955 PRODUCTION BROWN BASE
Here we have a single U52 DIRECTLY HEATED TAPE FILAMENT rectifier manufactured by Osram at their Hammersmith UK factory.  This device is AIr Ministry production as evinced by the grey base-envelope oversleeve.  These were applied by the AIr Ministry stores in 1958 as a palliative measure to prevent base loosening.  A little judicious work with a razor blade can remove the sleeve and in all probability the envelope will be tight to the base, but, I always leave these on as they are a sign of provenence andpart of these beautiful devices history.
 
This device carries the white cartouche CV575 markings in perfect white print displaying the date code HE which equates to May 1955.
 
Highly sought after not just for the impressive current delivery performance but for it's extreme musicality and deep bass extension in hifi applications this is a nice lot indeed. Even more so as it's in the delicious bulbous envelope presentatiion which not only enhances sound quality but looks wonderful. . No wonder all the high end magazines rave about these beauties.
 
This valve shows excellent bright getter and has the inverted cup getter pan situated down by the glass pinch, the valve base is tight to the envelope but there is some loose valve cement caught within the base , however, more importantly it tests as EXCELLENT using my Avo VCM163 valve tester. This exquisite device has good sharp getter, the classic U52 envelope shape and the trademark rounded brown low loss micanol base  - simply super.
 
Device test data: Ia = 120.0mA for both diode sections.
 
Device specification 120mA delivery for both diode sections. So you can see we have 100% emission from this venerable beauty
 

  

Availability: 1 in stock

£125.00 (GBP)
Picture of CANADIAN WESTINGHOUSE RED PRINT 5U4G
CANADIAN WESTINGHOUSE RED PRINT 5U4G

This is a rather special device, It's a CANADIAN WESTINGHOUSE  5U4G, manufactured in Canada.

 

The envelope is tight to the blackn low loss base which is beautifully marked in red print  and the device tests as EXCELLENT using my Avo VCM163 valve tester. Device test data: Ia = 120.0mA for both diode sections

Device specification 120mA delivery for both diode sections. So you can see we have 100% emission from this venerable and scarce beauty 


£56.00 (GBP)
Picture of CANADIAN WESTINGHOUSE RED PRINT 10E/115 AIR MINISTRY 5U4G FROM 1940S
CANADIAN WESTINGHOUSE RED PRINT 10E/115 AIR MINISTRY 5U4G FROM 1940S

 This is a rather special device, It's a CANADIAN WESTINGHOUSE 5U4G, manufactured in Canada.

The envelope is tight to the blackn low loss base which is beautifully marked in red print and the device tests as EXCELLENT using my Avo VCM163 valve tester. Device test data: Ia = 120.0mA for both diode sections

Device specification 120mA delivery for both diode sections. So you can see we have 100% emission from this venerable and scarce beauty

Availability: 1 in stock

£50.00 (GBP)
Picture of TUNG-SOL 5U4G CHARCOAL ANODES 1940S
TUNG-SOL 5U4G CHARCOAL ANODES 1940S

This is a rather special device, It's a Tung-Sol  5U4G, manufactured dueing the 1940s

The envelope is tight to the blackn low loss base which is beautifully marked in white print and the device tests as EXCELLENT using my Avo VCM163 valve tester. Device test data: Ia = 120.0mA for both diode sections

Device specification 120mA delivery for both diode sections. So you can see we have 100% emission from this venerable and scarce beauty  

Availability: 1 in stock

£50.00 (GBP)