AKAI GX-630d Reel To Reel Control Switch, Changes Reel Speed From 3-3/4 To 7-1/2. This part came from a working machine, this is one of two switches that control the reel speed, check photos to make sure this is the one you need, this may fit other Akai models, do your research to make sure it fits your machine, I also have other parts available for an AKAI GX-630d that I'm parting out, send me a message with what you need and I will list it, thanks for looking.