Reviews for Quantum Science Audio (QSA) Yellow Entry Level UK Mains Fuse - 3A, 5A & 13 Amp

Deep controlled sound but still with a clearer insight into vocals, including the backing singers. Nice.

After reading about this fuse in conjunction with PS Audio power regenerator PP15, I decided to try it.

I had it burned in for 48 hours and installed it between the wall and the power regenerator. OK, but not great. I ran it in for another 50 hours, and it became an excellent tiny bit of kit.

The treble was clearer with more detail. The Bass was clearer, and I could follow a bass guitar better. The soundstage was more comprehensive and deeper. Every instrument was nailed in place. The vocals were clearer and more realistic. Everything just sounded better.

Worth every penny of £200. By placing it in front of the power regenerator, it improved every bit of kit plugged into the PP15

I had previously been using fuses from another well-regarded company. These had given me a very nice upgrade in performance over standard fuses. I came across QSA on the Futureshop website, and my interest was immediately piqued. I bought a yellow one and put it on the mains plug for my Puritan conditioner. What an improvement! More yellow fuses quickly followed for my streamer and tube head amp, with a blue added to my DAC. Performance increased further In all the ways described by other reviewers.

One point worth emphasising is these fuses are very directional. I'd added the four fuses to my system and let them burn in for around 100 hours. The sound improved nicely over this period, and I was very happy. Then I started to check the direction of each fuse individually. I reversed the direction of two fuses, and the increase in sound quality was unbelievable. For me, the difference when changing the fuse direction was not immediately noticeable, but it became apparent after 10-15 minutes of listening.

Now, I wonder what a purple would sound like on my mains conditioner?

My thanks to Gary at Futureshop for his advice. Service from Futureshop was excellent, with next-day delivery.

I already owned a pair of blue and black fuses, so I decided to try the next one up in the range. As I hoped and expected, the yellow fuse provides an excellent uplift on my system.

The sound is significantly more detailed and relaxed. The soundstage is bigger and individual elements are more defined, almost like an amplifier upgrade. I will order another soon to try in my NAS drive.

The black fuse is a very good upgrade and excellent value, the blue is better, but the yellow is a significant step up on both (as you would expect). In hi-fi terms, they are all a bit of a bargain.

I can tell you that you need to have the best fuse upstream of lower models. If you have a mains conditioner with multiple outlets, you can share the benefits.

Recommended if you need deeper bass that is tight and fast.

I tried it in the preamp power cable first for a week, then in the regenerator power cable. In both cases, it significantly boosts the lower frequencies, some mid-range reduction and very good high-frequency extension. It needs at least 7 days to stabilise.

Quite different from other fuses and even the light blue, which was more linear. So not an across-the-board upgrade in my system.

Having tried many aftermarket fuses over the last few years, I have found this manufacturer's products convey a very natural and effortless presentation. Dynamics are very good too, and at some point, I will move up to the next variant, but I would regard this product as an essential requirement if you want to realise your equipment's potential.

It works very well with moderately priced power cords. I would say that this fuse in a moderate power cord will yield better results than fitting a moderately priced fuse in an expensive power cord. It's fundamental to getting the best from your existing equipment.

I wouldn't describe myself as an audiophile, but this product has been a revelation.

Fitted to my trusty VT233 with quad slots, it has produced deeper, darker colours and a more buttery, dare I say caramel-like, flavour to everything I put in it.

Yet, despite the added punch at high settings, it also proved able to perform on the low setting giving subtle gradations of light and dark.

Used the yellow UK mains on an extension block for a Naim system with excellent results.

I bought two yellows and used them on my Wireworld Matrix 2 extension block and my homemade Furutech mains cables for the blocks.

This gave my whole system n audible and obvious upgrade to the sound Really cheap improvement when you consider just how good the change is. If you use extension leads, you can get a massive difference on all your kit by just changing the fuse in the extension block leads.

To make this easier please refer to my review on the Purple fuse. You won't regret it.

https://www.futureshop.co.uk/quantum-science-audio-violet-mid-level-uk-13a-fuse#reviews