You are very welcome here soundray [like everyone else, which seems to be a bit unusual on the net-as far as I can judge!] There used to be an accepted ethos of general slow development with support but this has all changed with the advent of You Tube Demos [some of which can be very helpful] a general emphasis on retro items-especially record players believe it or not, plus changing all the capacitors and hoping to get lucky! I am very ignorant of Oscilloscope Techniques myself but I would take it up if attempting high end solid state audio repairs. There is little else to tell you what is really happening as far as I can see
By the way, you are not a subscriber. Many of us have offered to pay during difficult times in the past but Paul Stenning is our benefactor.
Cheers,
Dave W