I have a SE/30 with no sound waiting for some capacitors to arive to redo it. That unit works fine video wise.

Tants will last a long time, but even they have a lifespan and I think they tend to short when they go. I use whatever Apple originally used when I recap motherboards. I read somewhere that Aluminum capacitors like the ones we are replacing have a life or 2000 or 4000 hours of use (forget the exact number), so if they lasted 10+ years of constant use they will last forver of little use in our collections.

Thankfully the 68K macs tended to use a small variety of values for capacitors, 47uf 16v, 100uf 6.3v, 10uf 16v come to mind.