I've been watching all of Modern Vintage Gamer's content for about 9 months now. This guy puts out some really nice videos with high production quality. There was a great video about game disk copy-protection a few weeks back. Awesome stuff, and very well researched.

Some other really good content out there is Game Historian, RetroRGB, My Life in Gaming, and Wrestling with Gaming. If you're into hardware restoration then Retro Man Cave has a lot of content too.