U50, MARCONI, BROWN BASE, HAMMERSMITH JUNE 1955 PRODUCTION

U50, MARCONI,  BROWN BASE, HAMMERSMITH JUNE 1955 PRODUCTION

Carries both the GEC/MARCONI block cartouche with an elliptical 3 COLOUR LARGE 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.