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

@riccitone 
Like you I have a Furman now containing only FM tuner and tape deck. Believe I will move streamer and DAC from AudioQuest conditioner back over to Furman and see whether I get similar results. Thanks for the tip! 

Didn't pay much attention to power cords until I tried the AQ Storm Series.  That was a game changer for me.  

My first power cable purchase was a Shunyata Venom HC.  I didn’t hear much of a difference until I improved my system to be much more revealing.  Now I clearly hear the difference between the following cables I demoed; Shunyata, Audioquest and Cardas power cables.  

Shunyata. In fact that's all I use for Power.

It was the Shunyata Delta NR. Frankly, I was shocked over how a cable could make that much of a difference. But I did not like all of the changes (enhanced mids but at the cost of toning down the highs, i.e. less bright), but changing the fuse to a Rhodium fuse and then again to a Synergistic Purple fuse addressed that!