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Cool, I did clean the pots, will do the caps next. The issue is more like when a TV has a very critical horizontal hold - the waveform can appear double, or totally out of sync, and then pop into sync with a weird setting of the controls, for example when the horizontal gain is way up
I did remember I do have another scope, an old EICO from the 1950s. I dug it out of the garage, and unbelievable it works properly (I partially recapped it about 25 years ago) .
I think it may be useful to use the EICO to figure out what's going on inside the OSK-4.
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