Hi again Harvey and chaps.
One thing has become clear today, and that is that I shall need some time honing the skill necessary for using a millivolt tester to find faults
So, after spending several hours poking and prodding around on this board with the mV meter, yet without any success, it was easier (for now) to revert to the old habit of finding the end of the rail, and working backwards, isolating sections until the area at fault showed up, then zooming in with a lens and tester.
Which raises another question, as the fault on this board was where a technician had changed a capacitor, and had bent the legs over (to hold it in place?), and caused the an almost invisible short between one of the cap legs and the Gnd rail.
"This millivolt testing method is primarily for failed components, no? So was it that I had no chance with this method today, or am I just really bad at it?" Lol!
Anyway, looking forward, now that I've had a break from it, I still have that Tek 466 to finish, and have also picked up a Tektronix 455 with a low +95v rail to resolve, so I shall be practicing my mV meter skills on those this week and shall be back on here soon enough, I'm sure.
As always, respect and gratitude to all, for the time and sharing of knowledge. I can honestly say that I know more this Monday morning than I did last Friday evening.
Thank you.
James
James55