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Hey Tom,

Thanks for replying. I don't have any LED lights but I do have a florescence one (but that's spitting out crap at 50Hz so I assume it's fine). Either way, I took the scope to another room in the house and it's still the same. In fact, I'm facing a very similar problem to what's outlined here - /g/TekScopes/topic/7638108

I checked the grounding on the CRT tube, the resistance from the earth pin to the top of the tube, and it was in the order of ohms, so I cleaned up the ground clip contact, it reduced the resistance to sub-ohm, but this did not help.

So, I guess I had better start replacing some caps, the rifa ones looked cracked, so I'll start with these. The PSU filtering caps, are they all on A18?

Thanks again!

Max