This was posted in the dollars and sense forum on AK. (no affiliation just thought it was interesting)

http://cgi.ebay.ca/Vacuum-Tube-Radio-Ver-2-Otona-no-Kagaku-Gakken-EMS_W0QQitemZ300381437674QQcmdZViewItemQQptZKeyboa rds_MIDI?hash=item45f020feea

Well, THAT'S kinda neat....Expensive, but neat...

expnsv, neat, get rid of the horn, use a nice spkr. IMO.

Or do what I do...Rescue a worthy veteran waif from the local Aunty-Q Emporium, take it to Terry, have him re-cap it, & enjoy ! Still prolly get out for cheaper than that dern thing...

The schematic is posted here:

http://www.jarl.or.jp/Japanese/2_Joho/gakken-ver2/shinkukan-radio-ver2.htm

Would be easy enough to build from scratch. if one had the inclination.

They just had a similar kit at Ollie's bargain outlet-it used a single tube, and it lacked that horn, but the idea was very much the same. I think it was thirty bucks. I was tempted, but since one can potentially get a much much better tube radio for the money, I didn't bother.