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Old 19th Nov 2020, 11:18 am   #4
Welsh Anorak
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Join Date: Apr 2005
Location: North Wales, UK.
Posts: 5,351
Default Re: GEC Junior Fineline - yet another fault.

I'd go back to basics, which is the power supply, especially as there have been problems there before. If the voltage is low then the line frequency could be off and the waves (hum?)appear. Hang a meter on the HT and see if it's correct and doesn't vary with brightness. That will point you in the right direction.
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