I have successfully bought and sold used: McIntosh, Carver, Tandberg, Luxman, Denon, Yamaha, Onkyo, B&W, Klipsch, Mitsubishi, Technics, Fisher ...
Once you have photos and description, listing several places is easy.
listed/found/bought/sold on eBay (anticipate about 10% combined fees); slightly lower price (less fees, anticipate 4% PayPal seller's fee)) on usaudiomart, canuckaudiomart, reverb, craigslist, foreign sites.
some sites involve taxes, others don’t (helps buyers), and some, like eBay, add fees to the shipping cost (hurts sellers).
and as I am a member here now, I felt I should also list here. My latest, not what you think of as high falutin audiophile, (a piece I found/stated sounded great no matter it's cost) had multiple interest and sold here rather than the other sites.
IOW, don’t skip listing here as long as you have the photos and descriptions written.
returns: I offer unconditional returns, that helps me sell and get my asking prices. I don’t get returns, I wouldn’t sell/ship anything unless it was as described.