The split lugs in the 9000's seem to be offered from late 1976 through around 1981. The 1980 catalog utilizes the names "recording series" as well as "tour series." One source mentions that Yamaha started the 9000 series in 1975-1977 with the full length tension rods. On the early 8000 Tour series, the mahogany alternating center plies are wide - birch layers are very thin. Per Yamaha's 1878 catalog, 9000 series kick drums were 8 ply, 18" floor tom 7 ply, other toms 6 ply. The 9000D bass drum edge link under this, looks like 8 equally thick (all birch) layers to me. Sort of looks more like 6 equal birch plies rather than larger inner camelia/mahogany plies. This 9000 D series kit shows a nice close up of a rack tom bearing edge. what their historians have stated in blogs, and what actual Yahama 9000 collectors have found. Seems to be conflicting information out there published by Yamaha, vs. The 9000 DA is apparently always a mixed ply (ie pre-Tour Series). And this per Yamaha's own vintage drum guide and 1980/1981 catalogs suggesting or stating that 9000 drums could be either all birch or a ply. Would it be correct to say that the 9000 D series drums of this era are always all birch? The other ones (9000 DA, DE) seem like they could be a birch/camelia/mahogany ply mixture. These early Yamaha 9000 drums can be confusing. In fact, I did much of this same research back in January and forgot most of it.lol. I've done numeorus hours of reading on the topic, some of it here.
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