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

octal based biphasic directly heated HT rectifier valve

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.

 

Picture of OSRAM  CV575 MILITARY U52 BLACK BASE 1953 PRODUCTION
OSRAM CV575 MILITARY U52 BLACK BASE 1953 PRODUCTION
Here we have a single U52 DIRECTLY HEATED TAPE FILAMENT rectifier manufactured by Osram at their Hammersmith UK factory and carrying the cartouche code for March 1953 This valve shows excellent bright getter and has the inverted getter pansituated down by the glass pinch, the valve base is very slightly loose on the envelope, however, more importantly it tests as EXCELLENT using my Avo VCM163 valve tester. This exquisite device carries good white print, the classic U52 envelope shape and the trademark rounded black 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.
Stock Code: b350
Availability: 1 in stock
Delivery date: 1 week
€245.27
Picture of MARCONI  OSRAM  CV1071 MILITARY U52 BROWN BASE 1955 PRODUCTION
MARCONI OSRAM CV1071 MILITARY U52 BROWN BASE 1955 PRODUCTION
Here we have a single CV1071, a military specification U52 DIRECTLY HEATED TAPE FILAMENT rectifier manufactured by Marconi Osram at their Hammersmith Brook Green factory and carrying the cartouche code for August 1955. This valve shows excellent bright getter and has the inverted getter pan situated down by the glass pinch, the valve base is very slightly loose on the envelope, however, more importantly it tests as EXCELLENT using my Avo VCM163 valve tester. This exquisite device carries good white print, the classic U52 envelope shape and the trademark rounded brown low loss micanol base - simply super. The pobverse of the vale carries a large MArconi blue and white decal. 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.
Stock Code: b16
Availability: 1 in stock
Delivery date: 1 week
€228.15
Picture of OSRAM  10E/373 RAF AIR MINISTRY  U52 BLACK BASE WARTIME PRODUCTION
OSRAM 10E/373 RAF AIR MINISTRY U52 BLACK BASE WARTIME PRODUCTION
Here we have a single 10E/373 an Air Ministry military specification U52 DIRECTLY HEATED TAPE FILAMENT rectifier manufactured by Osram at their Hammersmith Brook Green factory sometime during the war years. This valve shows excellent bright getter and has the inverted getter pan situated down by the glass pinch, however, more importantly it tests as EXCELLENT using my Avo VCM163 valve tester. The valve is fitted with the Air Ministry trademark shrink ccollar encircling the envelope and base which was a palliative measure to prevent separation in hiogh altitude applications. This exquisite device carries good white print, the classic U52 envelope shape and the trademark rounded black 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.
Stock Code: a140
Availability: 1 in stock
Delivery date: 1 week
€222.45
Picture of OSRAM  10E/373 RAF AIR MINISTRY  U52 BLACK BASE WARTIME PRODUCTION
OSRAM 10E/373 RAF AIR MINISTRY U52 BLACK BASE WARTIME PRODUCTION
Here we have a single 10E/373 an AIr Ministry military specification U52 DIRECTLY HEATED TAPE FILAMENT rectifier manufactured by Osram at their Hammersmith Brook Green factory sometime during the war years. This valve shows excellent bright getter and has the inverted getter pan situated down by the glass pinch, however, more importantly it tests as EXCELLENT using my Avo VCM163 valve tester. This exquisite device carries good white print, the classic U52 envelope shape and the trademark rounded black 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.
Stock Code: a141
Availability: 1 in stock
Delivery date: 1 week
€222.45
Picture of MARCONI  OSRAM  5U4G MILITARY U52 BROWN BASE 1955 PRODUCTION
MARCONI OSRAM 5U4G MILITARY U52 BROWN BASE 1955 PRODUCTION
Here we have a single 5U4G, a military specification U52 DIRECTLY HEATED TAPE FILAMENT rectifier manufactured by Marconi Osram at their Hammersmith Brook Green factory which carries both white inked print and the etched elliptical wartime cartouche. This valve shows excellent bright getter and has the inverted getter pan situated down by the glass pinch, it tests as EXCELLENT using my Avo VCM163 valve tester. This exquisite device carries good white print, the classic U52 envelope shape and the trademark rounded brown low loss micanol base - simply super. The pobverse of the vale carries a large MArconi blue and white decal. 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.
Stock Code: g17
Availability: 1 in stock
Delivery date: 1 week
€228.15
Picture of SYLVANIA BLACK  BASE 5U4G RECTIFIER 1950S PRODUCTION
SYLVANIA BLACK BASE 5U4G RECTIFIER 1950S PRODUCTION
This Sylvania tall form ST envelope 5U4G valve shows excellent bright getter and tests as EXCELLENT using my Avo VCM163 valve tester. The black micanol base is tight to the envelope. 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.
Stock Code: k39
Availability: 1 in stock
Delivery date: 1 week
€62.74
Picture of TUNG-SOL VT-244 JAN 5U4G 5 RIB CHARCOAL ANODE
TUNG-SOL 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 offered, keenly sought, well, here's one on offer today!
Stock Code: z4
Availability: 1 in stock
Delivery date: 1 week
€85.56
Picture of NATIONAL UNION VT-244 JAN 5U4G 5 RIB CHARCOAL ANODE
NATIONAL UNION 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!
Stock Code: G6
Availability: 1 in stock
Delivery date: 1 week
€79.85
Picture of TOSHIBA NEC RIBBED ANODE SHORT FORM 5U4GB RECTIFIER 1960S PRODUCTION
TOSHIBA NEC RIBBED ANODE SHORT FORM 5U4GB RECTIFIER 1960S PRODUCTION
This NEC-TOSHIBA SHORT FORM envelope 5U4G valve shows excellent bright getter and tests as EXCELLENT using my Avo VCM163 valve tester. The black micanol base is tight to the envelope and the electrode cage features a 5 ribbed charcoal anode electrode cage - all the sonic character of it's ST enveloped brothers but in the short form envelope. 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.
Stock Code: x21
Availability: 1 in stock
Delivery date: 1 week
€28.52
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.
Stock Code: 819
Availability: 1 in stock
Delivery date: 1 week
€18.25
Picture of RCA SHORT FORM 5U4GB
RCA SHORT FORM 5U4GB
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.
Stock Code: y47
Availability: 1 in stock
Delivery date: 1 week
€18.25
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