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Hello I'm looking to buy a late 1970s/ early 80s Yamaha (either UX1 or U3). I have read up on the Xs having cross brace, UX1 is 121 high vs U3 is 131 etc, and can find lots of comparisons between UX1 vs U1, and UX3 vs U3, but not UX1 vs U3. I would appreciate people's views. I've played both in stor...