Quote:
Originally Posted by Heatercathodeshort
Change the frame output valve. These lines were known as 'telegraph wires, and were very common with the N379/PL84 valve. It is called bachxxxxxxI can't spell it oscillation!
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If you don't have a spare valve then you could also try putting a small magnet near the valve. I had the same problem with a GEC set and a magnet cured it for me.
