Gents
Thanks so much for all your clear pointers.
Yes, we all suspect the worst, when a problem appears.
Our diagnosing brain starts whirring away, tunneling through all the circuits, even in our sleep!
Glad to report that my scope is 100% OK - there was nothing wrong with it.
A simple ohm-check between the IEC earth pin and the chassis, confirmed that I did not have to open even a single screw.
The power cable was also OK.
The problem was a loose earth wire in the (Chinese) power strip.
Par for the course.
Menahem
