I seem to roll over a complete system about every 10 years, and I still have all the amps I ever built or purchased. I can't imagine a more desirable amp than I have, but I'm sure it will happen. I've gone from tubes to SS to tubes - what's next?
Do you own the last amp you'll ever buy?
What is the average lenghth of time a component will stay in your system before you upgrade? Are certain components less apt to be replaced than others? Do speakers tend to stay in a system longer than amps or preamps? If you've finally found the Holy Grail, how many years and changes did it take until you found it? Just curious.