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one last thing, I was setting up the votage calibration on my scope by setting the .5v square wave from the scope test point to 500mv to be 5 divisions (one full box). then when testing the PP on say the Horz drive, I would switch to 10x and 10v. I got to thinking that maybe this was adding up minor inaccuracys so I went back and set it up by using the 10v at 10x DC mode on the 350v B+ (verified with a DMM). I reset the scope to AC mode and then read the Horz drive 240v PP. The sams had it at 250v so I figure I am good and perhaps some of my earlier readings where just scope calibration problems. Live and learn. For now on I will try to calibrate the scope with a test voltage near the voltage I want to check.
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