CV378, COSSOR, ELECTRONIC TUBES, HIGH WYCOMBE FACTORY, 53KU, BROWN BASE, EX BBC VALVE STORES DATED AUGUST 1955

 CV378, COSSOR, ELECTRONIC TUBES, HIGH WYCOMBE FACTORY, 53KU,  BROWN BASE, EX BBC VALVE STORES DATED AUGUST 1955

On offer we have an incredibly scarce device for sale.  It's a Cossor produced 53KU, showing the characteristic balluster envelope, the parallelogram electrode cage and the swan neck getter plate.   A truly beautiful device with superb aesthetics and more importantly a superb performance.

Device test data: Ia = 120.0mA range, GOOD  A1 81 / A2 82.

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.