Hey y'all! I've had this Tek 2230 for quite some time, and it's a wonderful scope. It has no issues and works perfectly.
However, every time I unfocus the beam I notice tiny dots in the beam, as if there was a tiny honeycomb chain link fence in the CRT, like a shadow mask.
This isn't a problem at all, but it has always made me ponder what it could be.
Maybe someone who worked at Tek here knows the true answer.
I've had people guess it was a Shadow Mask or Aperture Grill of a CRT, but this is a monochrome CRT so it shouldn't have one. Others have thought it was the collector mesh, but those are used in analog storage CRTs. This is just a regular oscilloscope CRT.
Anyways thanks for taking a look here! I've provided some images below.