I first posted this problem at the end of another post, subject:
tektronix 2465a delayed sweep time problem
and tekman said that he had the same problem, and had to adjust the
grid bias as well as all other hv adjustments. I haven't tired this
yet, but I did take some pics while I was at work today.
http://skamego.no-ip.com/personal/mi...ope/scope.html
This shows the problem pretty well. Even with the trace intensity all
the way down, the trace is still very bright, and the dots seem to be
there most of the time (occasionally turning up the intensity will
make them go away). Does this seem like a hv problem? I haven't dug
too deeply into this scope yet, because I've been trying to fix the
other delayed sweep with the 2465a. If you need any more information,
I'll be happy to provide it, and I thanks for reading.

Thanks in advance,
Steve Kamego
Calibration Specialty Inc.