My 2150 had UHF connectors for video in and out, it had a tuner and mini-phone jack for audio in and out. I used the tuner to provide baseband audio and video to my VCR (which did not have a tuner).It's interesting to look back at the emergence of flat panel LCD displays. Pretty crummy quality & for years the benchmark of performance they were trying to match was CRT quality. Plasma pretty much did that and then other improvements have far exceeded what CRT could accomplish. Still, much respect should be given to the CRT whether in a test scope or consumer TV and don't forget the mega buck Sony front projectors around that also used CRT.
I still have a Sony 21" Trinitron professional monitor. Pro monitor in the sense no tuner, no speaker, just a bunch of BNC connections on the back. Knobby controls for adjustments you'd never see on a regular TV. It still worked great-last time I tried about 5 yrs ago. I wish I had more use for it than just nostalgia.
Ahh, the old days, when nostalgia was "in."