P-Mount Turntable Cartridge Shootout - Can you spot the difference between these cartridges? 

Did you measure and readjust the tracking force with the screw out? Mine showed quite a bit different when I didn't put the screw in. I disagree that playing a scratchy race. Is a good test. it might actually be a good test of a cartridge that isn't very vibrant because then it might mask some of the scratches. In that case, you might be better off with a low end, highly used stylus.

what’s the lesson?

Appreciate the video and found it interesting but after awhile I had a hard time following which cartridge was which. You'd just refer to them as "this one" throughout so I'm still a little confused which one (or ones) came out ahead.

What are the different stylus shapes?

I wish you gave the identity of each cartridge. Also run the audio directly from the receiver instead of relying on a microphone and desktop speakers. This would give your viewers a much more accurate representation of what is being played. Also details on what stylus profiles are being used would be helpful. With that, you're doing good, taking my suggestions would take your videos to a much higher level.

HAHA!!! that 3rd Record!! i HAVE IT!!! Great Record! I also have that Same Technics Player but the part that holds the stylus/cartridge is broken :(

they are between 2.5 to 5mv output 3.5mv is common.