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Heatercathodeshort · 7th Nov 2019, 10:38 am

Hello Robin. SNAP! Only this time it was a PYE B18T that a mate had done exactly the same with. Once you take them apart they never focus again no matter how hard you try.
There are warnings about this but not all service manuals mention it. I can't understand how it can loose magnetism simply by taking it apart and refitting it.
You will need either another replacement unit or any magnet suitable for a tetrode tube.
Frustrating and very annoying! It would be interesting to discover if anyone else has experienced the same phenomenon. Regards, John.

7th Nov 2019, 10:38 am	#2
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Ferguson 953T focus assembly Hello Robin. SNAP! Only this time it was a PYE B18T that a mate had done exactly the same with. Once you take them apart they never focus again no matter how hard you try. There are warnings about this but not all service manuals mention it. I can't understand how it can loose magnetism simply by taking it apart and refitting it. You will need either another replacement unit or any magnet suitable for a tetrode tube. Frustrating and very annoying! It would be interesting to discover if anyone else has experienced the same phenomenon. Regards, John.