@williamjohnston My deepest sympathies. Do you live near a major cancer center? There are many new treatments with remarkable results. A colleague whose stage 4 illness was diagnosed about a decade ago is still doing well (he was treated at Stanford). And I can personally vouch for MSK in NY; my daughter just beat breast cancer thanks to their expert care. But surely you've been through that roller coaster of hope and despair already. In any case, it's not what you asked about.
Others have recommended organizations that can help find new homes for your gear. I just looked at your virtual system, and it is certainly a treasure. But let me take a different approach to your plea.
The pleasure we get from audio, and from music, is deeply personal and, as such, is not really transferable. Most people, in my experience, don't care very much for sound quality anyway; even musicians rarely own fine equipment. There is an element of creativity in assembling a great audio system over many years, but just as the neurophysiology of hearing is very idiosyncratic, so is musical taste: the results of your efforts are, in total, something only you will ever properly appreciate.
When it comes down to it, this life lesson is true for every human value, even the highest of accomplishments. I'm sure others will have a different interpretation, but the final scenes in Lars von Trier's film "Melancholia" seem to me to speak to the futility of hoping to immortalize anything: as an errant planet speeds through space on a collision course with Earth, Beethoven's music is the soundtrack to the anticipation of total annihilation. Even the "immortal" Beethoven will ultimately be silenced, and it will be as if nothing ever happened. This may seem bleak, but it is also a consolation.
So tend to your own self, and to your wife, and to your dog, and to your friends. Don't worry about your things. They are meaningful only to you—but YOU are meaningful to them.