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U52, OSRAM, BLACK BASE, HAMMERSMITH, WARTIME PRODUCTION, VT-244, 5U4G, 5U4
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U52, OSRAM, BLACK BASE, HAMMERSMITH, WARTIME PRODUCTION, VT-244, 5U4G, 5U4 U52, OSRAM, BLACK BASE, HAMMERSMITH, WARTIME PRODUCTION, VT-244, 5U4G, 5U4 U52, OSRAM, BLACK BASE, HAMMERSMITH, WARTIME PRODUCTION, VT-244, 5U4G, 5U4

U52, OSRAM, BLACK BASE, HAMMERSMITH, WARTIME PRODUCTION, VT-244, 5U4G, 5U4

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U52, OSRAM, BLACK BASE,  HAMMERSMITH, WARTIME PRODUCTION, VT-244, 5U4G, 5U4

This Osram U52 valve shows excellent bright getter and tests as GOOD using my AVO VCM163 valve tester. The black base is tight to the envelope  and has both a white ink cartouche showing GEC manufacture as well as a faded white print ZB2  marking.

Device test data: Ia = 120.0mA range, GOOD  A1 70 / A2 73.

We test our rectifiers using a calibrated and standardised AVO VCM163 on the specified range.  This VCM gives a qualitative estimation of emission as you can see from the photo, the GOOD range bar runs below the numerical uA/Ig scale with the GOOD range between 51 - 100.  The above device test data, shows the max current range specified and a record of the numerical reading within the GOOD range obtained.

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