U52, OSRAM , 10E/373, RAF, AIR MINISTRY,   BLACK BASE, WARTIME PRODUCTION
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U52, OSRAM , 10E/373, RAF, AIR MINISTRY,   BLACK BASE, WARTIME PRODUCTION U52, OSRAM , 10E/373, RAF, AIR MINISTRY,   BLACK BASE, WARTIME PRODUCTION

U52, OSRAM , 10E/373, RAF, AIR MINISTRY, BLACK BASE, WARTIME PRODUCTION

  • £219.00

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U52, OSRAM , 10E/373, RAF, AIR MINISTRY,   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.


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