I bought a new Tanaka tenor sax a couple years ago and have yet to find out anything about who makes it. I, too, would like more information on the Tanaka brand.
I have heard that many times a famous sax player (or other instrumentalist) will have a company create a brand with their name and make a limited edition. There is a musician named Yasuto Tanaka from Japan (I think). I'm wondering if this be the case with him.
By the way, I love my Tanaka. It's very easy to play. The keys are fluid and move easily in faster pieces. It has a really good sound and in only 2 years I've had it in the shop one time for a minor air leak that I could have caused myself. Mine is the black nickle plated with silver nickle plated keys. It's a beautiful horn.
If anyone knows any information about the Tanaka brand, I would love to find out more.