I was surprised to discover that this kit is still available:
https://www.tubesandmore.com/products/K-488
I built one of these probably 30+ years ago. Same kit, same seller. I actually used it to play old radio programs into my collection of vintage radio sets. Then I loaned it to my bosses daughter who was doing a school science project on radio and used it to broadcast across the classroom.
Interesting to ponder if this is Part 15 compliant. I can't find the one I had. Probably buried in the attic someplace. Might need to build another.
TIB