If that's Marantz NR-1200, it's available in Thailand. At least it was a couple of years ago, and it's quite affordable. Cerwin Wega is also available here. You can even find it on Lazada, with older models available both on Lazada and Kaidee, where you'll also find a lot of vintage electronics. Open kaidee.com in Chrome and translate page to English to see descriptions in English as well, not just menus. There's a shop that has a marketplace also, Munkong Gadget. Unsure if it's still there but it is a high end electronics shop, and on forum people post ads for stuff they are selling (or buying).
As lots of high end stuff here are imported from Japan, be careful to inspect the photos for whether it's 220-240V model, or 100V model. Not difficult to get transformer, but they are bulky, especially 500W+ ones.
Then make up your mind if it's worth bringing it over.