Vinyl Asylum

are direct drive motors afected by power frequency?

180.200.180.254

digda_beat

I am in Australia and bought an American denon recently, US power is at 60Hz whereas AUs power cycles at 50Hz.
I had heard that direct drive motors weren't affected by that, but I have not had any luck getting the strobe to the right speed, although its getting close.
I wonder if I will get 50/50 yes/no answers :)

Follow Ups:

RE: are direct drive motors afected by power frequency? - Blackdog 04:16:41 09/15/14 (1)
Go to Vinyl Engine and download the service manual, and owners manual.
Page 16 of the owners manual shows you how to set speed. However page 7 of the service manual (under adjustments) tells you why your strobe doesn't work and how to easily fix it.

Dan Santoni
- http://www.vinylengine.com (Open in New Window)
- RE: are direct drive motors afected by power frequency? - bjh 21:28:08 09/15/14 (0)
  Well that's certainly exceeding expectations!
  
  Never trust an Atom, they Make Up everything!
RE: it's a dp 1200 - digda_beat 00:02:46 09/15/14 (1)
Nice looking deck to put in the TV room
- RE: it's a dp 1200 - Penguin 06:13:29 09/16/14 (0)
  Doesn't that deck use a magnetic strip on the underside of the platter? If that is damaged you are SOL. But there is also this thread on VE. Good luck
  
  dee
  ;-D
  
  True terror is to wake up one morning and discover that your high school class is running the country.
  
  quote by Kurt Vonnegut
  - http://www.vinylengine.com/turntable_forum/viewtopic.php?t=3 (Open in New Window)
RE: are direct drive motors afected by power frequency? - Blackdog 05:15:59 09/14/14 (0)
No they should not be affected by line frequency. Which model Denon do you have?
Dan Santoni
Motor no, strobe possibly. - Mark Kelly 05:14:02 09/14/14 (2)
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: 09/14/14
- RE: Motor no, strobe possibly. - digda_beat 03:52:53 09/15/14 (0)
  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
- RE: Motor no, strobe possibly. - mr.bear 10:29:55 09/14/14 (0)
  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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