I'm looking for a display that is electrostatically deflected using a 3-5 inch round CRT where the whole unit is fairly compact.

I'm wanting to make an oscilloscope clock for use at work, but the typical older scope that uses a 5" round CRT is too big for me to have on my desk.

Needs to use a CRT using a burn resistant phosphor and/or a commonly available CRT.

A square or any other shape CRT is a no-go unless I think the device is interesting enough.

Also I don't care about the bandwidth as I fully intend to use a complete clock kit which includes a power supply and deflection amp given my favorite clock board (Dutchtronix oscilloscope clock) is no longer being made.