Listening to the 500C through my Talon Peregrine X Mark IIs is simply an wonderful experience given not only the age of the unit but in, many respects, absolute terms as well. The spaciousness with efficient great speakers (mine are 95db efficient) is superb. Evaluating equipment that is going on nearly half a century old first depends on being sure the equipment is tuned up, maintainance done and good quality and strong tubes installed. It also depends on system synergy, musical preferences etc. I thought there would be far more faults in the unit. I just sit back and enjoy some Miles Davis or Mozart. We have some really great, non-compressed FM Stations here in Madison, Wisconsin including www.wort-fm.org and the Fisher 500C really convey's the music and voice (e.g., for example The Prairie Home Companion on NPR) in a lifelike, "you are there way" that evades nearly all solid state units.
It is amazing to see how much audio and other products have slide backwards via successful marketing campaigns to sell us cheaper stuff that is easier to manufacture and/or give convenience. But the convenience (as in what MP3 is to music or McDonalds is to food) misses the point of the stuff (LPs to CDs, CDs to MP3) Tubes to early solid state, analog to digital tuners etc). There is something about not expecting much and being very pleasantly surprized. There is also something, negative, to an entire generation growing up assuming convenience is the point of living and misses the point of things or the way things are enjoyed that can elevate the experience of living but require something from you.