Audio gear isn't really an investment, at least one with other than audio returns
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I don't see a whole lot of value in old analog systems, been there done that and mostly don't use what I still have from that era but I don't use analog sources much (still have a tt and record collection, but it's not used much. and works fine with my more digital based gear, too). Old TVs other than plasma, I'd definitely look to modern sets. YMMV of course....
Old speakers can be okay, but vintage is more than simply being old, too. Some were iconic/vintage for a good reason, many are simply old. I liked some of the speakers from when I first got "into" audio in the early 70s, like my Original Advents (that I ended up buying) and some of the JBLs (L100 and some of the studio stuff I couldn't afford). Some of the original AR speakers I liked, too. I don't even remember them all now. I did most of my listening at a couple stereo shops and friends' houses to get an idea for what was out there, don't even remember them all. I was mostly budget limited then, too....
I don't live where speaker shopping is but a really long drive, so I've tended the last coupla times to take my chances with the internet after doing some research of what was widely liked and measured reasonably well. Speakers are largely a personal subjective choice....like tone quality or sounding lighter than what you prefer...what does that mean to you vs another?