I was fortunate to receive a shipment of adapters before the tragic fire at Retroelctronik. So I finally found time to work on a Solotone Entertainer and was able to figure out how to make it work with a WB2MP3 Packard adapter. This was the last model Solotone so it had 14 selections unlike the first model Solotone where you had only one selection. there is no room inside the box to mount the adapter so I installed in the shelf the wallbox sits on.
https://youtu.be/yWf-YVbk5Yk