God, I hate to ask this…

Sorry to hear this. I to am long past the days when I was 6ft tall and bullet proof, If I make it 3 more years, I will become the longest lived member of the male line in my family. All that aside. I have had the same thoughts as you. I have a modest audio system and some Martin guitars that are probably worth more than my electronics.

Unfortunately, my wife cares little about either of my passions. I have no offspring to pass anything down to. If I had any other relatives that deserved or showed any interest, I would consider leaving something to them. So, when I assume room temp, I suppose she will sell everything and enjoy the proceeds (not the she will need it). I'm leaning toward the attitude of what will be will be, Once I'm gone, it really won't matter.

I’m sorry to hear about your health issues, and pray for your recovery. I live alone and my two adult daughters Neither know anything about Audio gear or care to learn. i’ve instructed them to contact my dealer who I trust to give them good advice for it’s disposal when the time comes. I think TMR is another good option. While their commission is not cheap, they help with everything and will turn your equipment into cash with absolutely no possibility of having to deal with unhappy or unscrupulous buyers.  They are good at what they do and I think they would try to make this as easy as possible for your family if that becomes necessary.

it is so good of you to think of taking care of this now now, but if your system brings you joy, I suspect your family would want you to hang onto it and with clear instructions, they can deal with it without undue stress. Just a thought.

God bless you

As so many others on this forum I am not a spring chicken and also face the consequences of age. 
My thoughts and prayers to your future. 
That said… if your affairs are in order and the wife is not in need of the full value of your toys consider simply giving away stuff. Not necessarily with zero renumeration but priced to be gone.
Maybe give some of it away to a sorority or fraternity house. Let it get used. 
Hold an auction with the proceeds to go to the folks of your choice. 
I walk around my house looking at the tools, nuts, bolts, and bull crap I have accumulated and start chuckling.
I am currently in the process of dispersing my collection of superfluous bull feces. Easier said than done.

I have thinking about this stuff, too. My hobby is going to a computer museum. My guns are going to a younger new friend. My late 70s/80s era audio system is going to an audio store that repairs and sells said stuff.

After everything else is sold the cash will be spread across a few animal aid organizations.

It's very charitable if they were to get sold or donated to audio folks of any level, who will enjoy all of it for what it was intended for. My hope is that my lifetime of specialized knick knacks "will reach the right people". Thats good enough for me!