Recently I had a spare Switch and a little time, and got inspired to pull off a 50/60Hz Mod to the Master System on the german circuit-board.
I know there’s also a switchless mod, but I didn’t have the needed parts at hand.
Also, the SystemBoard in my Master System was already (factory)-modded. Turned out I had a french RGB Model, which uses an NTSC Board which is forced to PAL 50Hz output.
It’s a very easy to do modification. Even easier than the Mega Drive Mod, because you have much more space to put your switch.
All you need is 3 wires, a cutter, and a on-on switch.
Games play much better in 60Hz, the image is bigger, sound and speed are about 20% faster than PAL mode.