Warning: NERD ALERT!
Not that John DeChristopher, Dave Mattacks, or again of the great panelists from this great discussion of Ringo and his gear on the "Get Back" sessions are nerds, far from it. I would say, however, this is for serious students of the Beatles and Ringo! Fascinating.
I will also say, in closing, that despite all the analysis of Mr. Starkey's instruments, the greatest instrument, of course, is Ringo himself. :)