Look in your local big city newspaper for anyone buying used/vintage gear. Call Audio Classics. Post on Audiogon. Place "vintage audio" into a search engine and find people who buy what you have to sell.

I think Audiogon is your best bet. You'll reach the most people and it's the most targeted way of selling your stuff.

I have found Craigslist great for selling locally. I have bought my daughter a car from there, and for me, a cheap set of 901 V (I know, they're probably hated here lol) I just wanted music everywhere in my Poolroom, and I added a sub and high frequency speakers to supplement the Bose defficiency. Back to the subject, you might have luck with it.

When you're considering selling through a venue where items are usually shipped to the buyer (like Ebay or Audiogon) vs. a venue where the buyer comes to your house (like craigslist) you should consider whether or not you want to open your home to the general public.

There are all kinds of characters out there.

Shipping a turntable can be tricky, but a Rega can generally be easier to ship than, say, an LP12.