CRT should work without additional hardware, just by using the headphone jack.
There is a known CRT bug since LE 10.0.2, and I don't know whether it's fixed now. So please test with LE 10.0.1.
Here are the settings: Click!
Hi, it's not about a "classic" CRT TV display with composite video input. I repaired things like this 15-20 years ago, know them well, but even in that era, that type of connetion was very rare compared with VGA. It's a CRT monitor for PC with RGB input, three BNC connector for Red, Green and Blue analogue signals, usually with synchro signal mixed on Green or another two BNC input (for V-sync and H-sync signal). Same as the VGA connector signals, but without EDID connection. The RPi's composite video from jack connector can't be used for this and probably harder to transcode to analogue RGB than the HDMI output.
The cable (used after a HDMI-VGA adapter) probably is like this: