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I have two turntables and I'm trying to decide which to keep and which to sell. In general, which one is better?

Technics DC servo SL-BD20 or Dual CS 530?

Thanks
 

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which is better?

IIRC both of those decent mid-range belt drive tables had specs which were better than garbage, and not quite as good as ultra-fi. Presumably you have cartridges in both and can hook them into your system. So do that! Pick an album that has a good long quiet section, listen into that:
Is there audible rumble? This speaks to how the drive's noise makes it through.
If you take a step in the room does it make the sound boom? Isolation is important unless you can guarantee that nobody will be walking around.
Then play a sustained piano note that is held for several seconds (not electric piano, it seems that acoustic ones' sound will show this up better). Listen for changes in the note. This speaks to speed consistency.

Unless one fails the above tests by comparison, do what FMW said and keep the one with the better cartridge! Or sell them both and get what you really want. There are plenty of discussion threads on that too.
 
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