Raymond: You are correct, I have not gotten to check the power supply yet. For one I've so far had some issues finding what exact values I'm looking for (ie. acceptable ripple value) in my service manual and just haven't had time to pull the power supply out without knowing what I'm looking for. Also, the flare in the display (I think you were referring to my video? Or else I'm imagining things) I didn't even notice that weird change in brightness until you pointed it out, shouldn't have been caused by the camera anyway, all the exposure settings were fixed.
Paul: I do get the same pattern (and similar size gaps) on pretty much any frequency (Tested from 5hz to 10Mhz) and at any sweep settings (though I haven't tested single shot acquisitions might need to get my 7B87) Also the alignment pattern appears fine both warm (powered on for a while) and cold (Off for more than 2 hours with the external ram supply active)
/g/TekScopes/photo/252782/0?p=Created,,,20,2,0,0
Albert: Yeah, generally the calibrator is fine in analog. But as you noticed, and seems to be the case for any signal from any source, (until the issue disappears a while after it starts) they are recorded at half value. I'll try and get some more photos up demonstrating this.
And unfortunately my proper DVM let the smoke out rather violently a few weeks ago, so I'm stuck with a multi-meter for measurements until I can source a reasonably priced replacement.