I’ve been working for a while trying to determine the cause of very faint horizontal lines that move from the bottom to the top of the CRT every few seconds. While I can see them perfectly with my eyes I’ve had a hard time documenting them in a photo or video. Here is my best attempt to capture them in a short video. I don’t have a good camera where I can fine adjust the shutter speed so this was just done on my iPhone. I can reproduce this on several SE/30 and SE computers and I have an idea what might be causing it but would rather not get into that at this time until I can get someone else to confirm they have also noticed this.
Manuel
Manuel