I’ve been collecting vintage audio gear for years, including some older Encore models. Main thing – keep them clean and dry, and don’t push the volume to max for long periods. Dust inside can kill them faster than anything, so a gentle cleaning every few months helps a lot. You can also check manuals here for specific maintenance tips – sometimes they list recommended cleaning methods and compatible parts https://manuals.online/encore. My oldest piece is over 25 years old and still runs smooth just because I baby it a little.