The aiwa CSD-GM1, the first, and only? boombox with a built in video game system. Don't bother going over to wikiboombox.com, it isn't there. Released in 1994 this meshed up with the Sega Mega CD Game System. I bet this early stereo TV game system sounded really good.
Interesting, but doesn't look like it would sound very good. By the mid-80s it wasn't hard to find a stereo TV that sounded pretty good.
I have one Aiwa Walkman that works well (almost like new) after replacing the belts a few years ago. Virtually EVERY OTHER Aiwa tape machine I've ever worked on was an unholy concatenation of being hideously difficult to service, unavailable service data and/or lack of aftermarket (or used) parts availability. This may or may not be difficult to work on, but I'm not sure the audio quality "juice" would be worth the time/effort "squeeze". YMMV. I'm not a gamer, although I'm quickly becoming undeniably "vintage". It only took me about $10-15 in 1982 quarters to ascertain that I couldn't afford to become proficient at Asteroids/Star Castles/Galaga or whatever it was. ; - )
