CV575, Military Spec 5U4G, British Tungsram, 5 Rib Striated Charcoal T Shaped Plate, Triple Mica, D Bar Getter, Brown Micanol Base, Tottenham March 1953 Production, 5U4

CV575, Military Spec 5U4G, British Tungsram, 5 Rib Striated Charcoal T Shaped Plate, Triple Mica, D Bar Getter, Brown Micanol Base, Tottenham March 1953 Production, 5U4

This  valve shows excellent bright getter and tests as GOOD using my AVO VCM163 valve tester. 

Device test data: Ia = 120.0mA range, GOOD  A1 81/ A2 78.

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.