UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - What happens if a valve's cathode becomes electrically detached ?

Heatercathodeshort · 15th Sep 2021, 4:50 pm

O/C cathode connections in television CRTs was a problem in the 1960s, Mazda in particular. The usual cause of the fault was the connection between the cathode and the lead out wire. The tiny weld joining the cathode to the wire failed. If you tapped the neck the very temporary return of the picture proved the point. It could of course happen with valves. J.

15th Sep 2021, 4:50 pm	#13
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: What happens if a valve's cathode becomes electrically detached ? O/C cathode connections in television CRTs was a problem in the 1960s, Mazda in particular. The usual cause of the fault was the connection between the cathode and the lead out wire. The tiny weld joining the cathode to the wire failed. If you tapped the neck the very temporary return of the picture proved the point. It could of course happen with valves. J.