All-Ceramic Prototype CRT
Our March 2023 Photo of the Month was this image of a prototype all-ceramic CRT which is in the collection of one of our volunteers. We had no further information on it, or why it was developed, or why it wasn't pursued further.
We found this excerpt from a technical article Tektronix' DMM/scope: a new record in portability in the February 20, 1975 Electronics magazine. The article describes the development of the 200 series of mini-scopes led by David Allen.
The full article is on our 200 Series Oscilloscopes page. Mystery solved!