An earlier magnetic tape cartridge technology introduced by Lear Jet in 1964 as Stereo 8, although widely known by its 8-track moniker. Stereo 8 was an 8-track version of the 4-track Muntz ...
For reasons still unclear, [Techmoan] has procured an RCA 8-track changer that holds five tape cartridges in a custom carrier. It somewhat works, but had a bit of mechanical issues here and there ...
The electronics from the cassette adapter are simply placed inside an old 8-track tape, with holes cut in the chassis for the charge port and on switch. Then, all you need to do is pop the adapter ...