It's a tuner combined with an integrated amp, with single ended output. Not a lot of power, but a sweet sound; see post 6 above. Would make a great bedroom or office system. I suggest he tries it with a CD player or similar input to assess whether it is useful to him in the real world. It's in great cosmetic condition and clearly in working order. If it were mine, I'd definitely restore and use it.
If you/he are willing to replace the capacitors, it could be put into daily use. If not, those old grey caps will fail sooner or later, maybe causing long term damage. You don't say whether you heard any hum, but that is an indicator that the power supply caps are not filtering and smoothing the rectified AC adequately. The replacement cost of the caps is not great, I'm guessing less than $50 in total. If you want to recap, there is help here. The printed circuit boards will make some of the work easier, but also require you to be careful with them.