U50, MARCONI, BLACK BASE, HAMMERSMITH JANUARY 1956 PRODUCTION

U50, MARCONI,  BLACK BASE, HAMMERSMITH JANUARY 1956 PRODUCTION

Carries both the MOV block cartouche with an elliptical three colour Marconi decal on the obverse of the envelope

Device test data: Ia = 60.0mA range, GOOD  A1 67/ A2 67.

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.