FUSES??? Just when I just replaced all my PC cords.

So I come across what I think is the next magic pill. "FUSES" Synergistic Research RED Quantum Fuse to be specific. Guaranteed to make a significant improvement in overall sound quality. Or a full refund. Gotta love that, total satisfaction. So, it's got my interest. Let's say one would like to challenge the promise. I have a Jolida tube amp (801) a Jolida JD9II phono pre and a Jolida glass tube DAC III. And I would like to try one fuse to start with. Which of the three components of my system would you recommend trying first?

Thanks in advance for any opinons.