Found over on Archive.org, there's not a lot of Cybernet Audio Information but I found this German Catalog, the rest of the brochure is component audio but here's the cool Cybernet PS-101 Pocket Stereo. A later Cybernet Model was featured in the back of American Magazines as a close-out high end model.
Here's some more information on the Cybernet PS-103, the add also says they are part of Kyocera, which includes KLH with explains the very similar KLH Solo models.
I don't think many Cybernet Stereos ended up in the USA, they look very German in design. From 1979, the tape deck is about as minimalistic as you can get!