Thanks for the feedback. Just to clarify, this is a 570, not a 575, although there are a few similarities.
I checked with an acquaintance who also has an early 570 like mine and he said that his floating unregulated voltages were high as well. He reminded me that Tektronix mentioned upgrading the caps in the floating unregulated supply from 450v to 500v in the modification summary document. They say that the caps on the floating unregulated supplies would exceed their rating at high line. I haven't tried setting the line to high line yet (125vac) - I have a feeling it will exceed the 500v rating on those caps. He mention upgrading his to 600v. It just bothers me that the manual states they should be within 5% of -300v and +400v, and I'm sitting at 16% high on the -300v supply and 12% high on the +400v supply, when testing at their specified 117vac line voltage. All of the regulated supply voltages are spot on, as are the non-floating unregulated supplies.
-150v = -150.66
+100v = +100.03
+300v = +305v (they allow +/- 6v)
+400v unregulated = +411 (they allow +/- 32v)
-300v unregulated = -310 (they allow +/- 24v)
so, it's just the two additional FLOATING unregulated supplies that are reading high.
+400v floating unregulated = +446v
-300v floating unregulated = -350v
I think at this point I will proceed with the rest of the calibration procedure, maybe I'll run into other issues that will give me some clues.
