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In Reply to: RE: are direct drive motors afected by power frequency? posted by digda_beat on September 14, 2014 at 04:46:36
Every DD I've ever seen rectifies the supplied power and synthesises a drive waveform at the required frequency. Since about 1969 this has usually been controlled by a frequency generator (in turn usually controlled by a quartz crystal).The strobe, however, is another matter. Some tables (eg Technics) run a different frequency generator for the strobe, usually controlled from the same source, to one or more LEDs.
Your Denon may use a mains frequency strobe, which would cause the problem you describe. What model is it?
Mark Kelly
Edits: 09/14/14Follow Ups:
Thanks for the suggestion, I tried the iPhone speed tester and it gave a different result to the strobe, so if it's accuTe it may be the way to fix it
All the older Denon's I've seen the innards of use a strobe derive from the oscillator frequency, not the powerline. I believe the only caution here is that the power transformer can handle 50Hz without core saturation or overheating.
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