Oh, I have seen no one mention the best of all boom boxes: the Sanyo M9970.
This little beauty had RCA jacks in and out, a tape monitor, accepted normal/hi bias/metal tapes for playback and recording, a great fm receiver on it, and it has seperate volume levels for the left and right channels.
The speakers were awesome - in fact, when the tweeters in my parents crappy Cerwin Vegas blew out for about the 20th time in 10 years, I just hooked the Sanyo up and used the box for tweeters. (Frankly, it sounded better than the Cerwin Vega tweeters.)
And did anyone notice the peak lights at the base of this unit? Teenage boy heavan!
Plus, with like 6 D size batteries, my friends called the Sanyo A Ghengas Blaster. That box screamed DFW.
It was with this box that I learned I could make better recordings from FM broadcasts of albums then I could buy in the record store. I bet I had every Pink Floyd album recorded this way, and a host of Zepplin, Supertramp, and Tom Petty, too. I learned the quality of the tape made all the difference. I think this is why I am a quality nut to this day.