Chris - I will pull those Plug-ins later today. My mind locked onto a power supply problem ... that's why I like to ask questions on a Forum .... makes me think a bit more.
I watched a few 7603 scope videos on Youtube awhile ago whilst considering which Tek scope to chase .... found them again today ... cmjones01 ... same person I presume??
Adrian - yes, I have been reading your Thread ... those connections are now on my "To Check" list.