Component obsolescence

Well, except for the age associated degradation of cetain internal parts, the unit will sound as well as it ever did when it was new. If you replace these parts, like the capacitors primarily, you can keep the majority of the original sound. If you like that sound, there is nothing wrong with staying with it. Some people might like that "older" sound quality better, and I would not judge that. I do think that sound quality has gotten better with technology improvements over time with alot of components, but not everyone may agree with my opinion on that(or anything else, for that matter). But some stuff, like the great phono sections from the 80s continue to surpass the new stuff, except for certain megabuck ones. But you must maintain them, if you want to keep the performance.

My experience is that many older designs can easily hang with current designs IF the "technology" of newer passive parts ( resistors, capacitors, diodes, wiring ) is brought up to date. Most of the "improvements" in audio products have not come about because we have a whole new way of designing gear, it is because we simply have better quality raw parts to work with. There are plenty of "old" designs out there that measured phenomenally well, were wide bandwidth, offered excellent transient response, had low distortion without gobs of negative feedback, etc... Finding these and updating them can give you world class performance for pennies on the dollar and the cost of new parts and some personal elbow grease.

As to things that DO "fall by the wayside" quickly, start looking at various surround sound processors. Dolby Pro Logic processors are selling for anywhere from 10% to 20% of MSRP when new. That does not mean that they will not work, but simply shows that there is very little need / desire for them.

So long as something functions as intended and someone will use it as designed, a product is never "obsolete". It is just not "highly marketable". Sean
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Obsolesnece only applies to Digital(DACs keep getting better and cheaper all the time) and to computers which are obsolete before they hit the MFG floor.

Thanks for the interesting responses.