[old_tv_nut]

Originally Posted by TinCanAlley

Here's the B+ 240V that feeds the video outputs. Again, I don't know why I sometimes get two traces. I don't have a reference waveform to compare it to, but it does seem that there is ringing in it.

There is no way to tell if this is significant if you don't tell us the volts/division setting of your scope so we know what the peak-to-peak value of this waveform is.

Edit: I see you did tell the settings on a previous waveform. I suggest you check the filter cap as suggested by Zeno.