Bingo!
Quote:
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As I said a bit earlier (I think we were typing at the same time!) disconnecting the inputs to the CDA panel from the decoder panel gives a good clean monochrome picture.
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I think we were! It seemed even weirder when I saw that the ringing fault went when you dissed the decoder output. That did not make sense, and when this happens, it is inevitable due to something obvious or silly.
I guess someone had twizzed the PAL balance pot in a vain attempt to cure the fault (!)
So, the fault was
after the CDA and before the
tube. I should have remembered spraying switch cleaner on my hands to remove the sticky yellow mess on my fingers when I serviced these.
I'll archive this thread in due course ...