I don't have an actual tape for you, but I have something I made myself. They are improvised instrumentals I performed and added some hiss and distortion to make them sound like they are ripped from a new age cassette from the 80s. It's my love letter to released like Valley of The Sun.
Buy Album/Hear full length tracks here: https://deirdre-airlines.bandcamp.com/album/spectral-fractal
It's available for five dollars. I hope you enjoy the fruits of my labor. I have another album coming out soon with a fellow ambient artist.
In the meantime, I hope I can find more actual old releases to upload here.