For example, I have both the Diamond Disc version of "Mylona--Hawaiian Waltz" by the Waikiki Hawaiian Orch (DD #50676-R) and its Blue Amberol dub (#3274). Playing both, I use my hand-held tachometer to make sure that the disc machine is operating at 80 RPM--and then I adjust the cylinder player to synchronize with that. In the case of the two records above, I have to bring my cylinder machine down to 149 RPM to match--and Blue Amberols are supposed to run at 160 RPM.
Wow, an 11 RPM difference. That demonstrates how inexact the Edison people were in dubbing the Blue Amberols in terms of matching correct speeds with the discs.
I suppose one could make a study of this to see which periods over the entire life of the dubbed Blue Amberols were better--or worse--in terms of speed synchronization. At present I have 53 DD sides in my possession that are dubbed onto cylinders that I also own--so I guess I will give myself that assignment for someday.
 
 The example cited above involves a recording from July 1917. Maybe that's the worst it ever got--and maybe things tightened up after that? Anecdotes, anyone?
Ralph
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