I've heard upgrading the amp power cable bears some fruit but it's fairly pointless to upgrade the TT power cable.
Have most upgraded one of the other here?
I did like my upgrade on the phono ICs. I think Technics includes some decent RCAs but expects customers will upgrade in the end.
If you want to try cables, Crutchfield has a nice 60 day policy.
I put an upgraded power cord on my VPI’s motor simply because I had an extra. I can’t say I noticed any change with it, but it looks nice and it the right length.
It’s been my experience, with the equipment I own, that the general rule of thumb is the closer to the source, the bigger the difference. Also, some items/sources reflect more of a change than others. The standout biggest change I’ve experienced was changing the power cord on my AppleTV 4K. And yes, as daft as this sounds, the cable was more expensive than the ATV4K.
Other sources I’ve had positive results with are my tube phono pre, DAC, streamer, my hybrid integrated amp, and my AV preamp.
I can’t say I’ve noticed much improvement on my class D amps in my HT, subs, the aforementioned VPI, or my JVC projector.
It’s an interesting tweak, and I’d not worry about it until you’ve gotten the rest of the system sorted. I’ve found though that upgraded power cords can make more of a difference than IC’s. I also tried swapping power cables as a skeptic, I really didn’t think there would be any difference, and I was surprised to find one.
I’ve also noticed that some brands (Audioquest and Shunyata, when you start looking at mid tier and up) made more of a difference than others (Cullen, Morrow, Anti-Cable).
Regarding power conditioning, I have units from Furman in their “Elite” line. They are very handy and as we get decent thunderstorms I feel a little better that the equipment has “some” protection. I don’t feel that the Furman’s have made any noticeable audio or video improvements though.
Of course, IMHO, YMMV, etc.