If I had to choose just one keyboard youtuber to watch, it would be Chyrosran22, due to my great interest in vintage keyboards and of course his soothing voice.
Other favorites that are already mentioned above are :3ildcat, Shoobs, TaeKeyboards, Manofintrest and DBOKEY.
More favorite channels not mentioned so far:
- IO SAm - Impressive in-depth videos.
- v2 - A lot of sound tests.
- Topre Mania - Typing tests for Topre lovers. Sadly last video is 3 years old.
- Taeha Types and Taeha Tapes - No introduction needed here.