What was the first power cable that you noticed a difference in the sound?

As usual, @atmasphere has the most informative, scientifically based posts and explanations with respect to electronics and audio equipment.  

It is for sure a rational and very interesting explanation...

We are lucky to have him here...

As usual, @atmasphere has the most informative, scientifically based posts and explanations with respect to electronics and audio equipment.  

I fully agree.

I now have mono blocks and there’s an old style Cardas Clear Beyond for sale in Canada. If I buy a new style cable that has different plugs on the ends will there be a noticeable difference in the sound between the A style and the B style?

Thanks.

Agree with others noted above dedicated lines should be done first but not necessary. I started with Homebrew PC’s, then Kimber Kable PK 10 Gold which was a noticeable improvement, then to Nordost Vishnu, WyWires Silver to Platinum which are great and can be had used at a great price for how they sound. I recently picked up a slightly used Nordost Valhalla II which is an incredible PC but even used are a little crazy. Don’t forget the wall outlet/receptacles. Recall someone previously mentioned don’t bother and just get an AQ Power Conditioner; not saying that’s not a great device, but even with my PS Audio P10, Dedicated lines, with AQ NRG outlets and WyWires Platinum PC is still noticeable on my P10 feeding all source components and preamp.