I use a Shunyata Diamondback power cord on my VPI Scout. Gives me good peace of mind.
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I did; thought it made some difference. If I were to change only one it would be from the SDS to the table on the grounds that the SDS regenerated the current and you want to preserve as much of the effect as you can. You can discount my view as I am a VPI dealer but I have always found the SDS makes a considerable difference on both VPIs and some other tables I have used it on. Shunyata makes good PCs, as do PS Audio, Transparent, Oyaide etc. But the only way to really tell is to try it yourself. Get a good one with return privileges and see if it makes a difference TO YOU.
Yes, I also found PC to make a different, not huge as on pre/power amp but certainly well worth a few hundreds dollars .However, you have to be careful as the recess on the back of SDS won't let you fit a garden hose variety of PC with big plugs. PC that I use mostly in my system is Stealth Dream and that definitely won't fit in the back for SDS (for SDS to turntable).
I did not find any performance gain by changing out power chords for the SDS and the motor on my VPI TNT MK5. First of all there is no audio signal going through the SDS. The purpose of the SDS is to reduce voltage to the motor after it gets up to the correct speed, 33.3 or 45. This is to reduce vibration. Less vibration better sound!
To prove this point, I made up a power chord from lamp chord, pure junk. Plugged it into the SDS and no difference in sound! Save your money, the power chords that come with the SDS and the motor will work just fine. Look somewhere else in your system to spend money for sonic improvements.