Piggy Tail Power Cables

I had check-boxed fuses off as a facet I wouldn't bother toiling over after 'sampling' a couple Hifi fuses and coming back to the stock fuse the manufacturer supplied and used while designing and trialing their product on both counts.

In short, I had come to the conclusion that Hifi fuses are not for me as both added coloration.

Enter the SFDB. It works without adding coloration. Everything opens up, is more resolved and dynamic, and with a noticeable drop in 'digitus'. I am not a believer in Hifi fuses, but can hence highly recommend the SFDB.

Additionally, communication with Mark, and others at Vera-Fi Audio, has been a pleasure.

I wasn't sure what to expect when I initially ordered a SDFB and graphene sluggo for my DAC. After reading many positive user reviews and speaking to a dealer in my area who recommended them highly, I decided to take a chance and place an order with Mark.

After an easy installation process, I was quite shocked with the sound improvement. Vocals are now much more present, improved separation, soundstage and depth/layering. The music flows from my speakers with a relaxed ease. I was so impressed with the results, I immediately ordered 3 more. One for my preamp, power amp and switch. Each fuse box made noticeable improvements in my system, especially the ones on my DAC and switch. Very impressive performance improvement for a relatively low cost compared to the other components in my system. The only negative thing I can say about the fuse box is if you try one, you may end up wanting one for each component in your system!

Everything you've read but Mark in the other reviews is absolutely true. He's a truly wonderful guy to deal with. He was always quick to respond to all my messages and went out of his way to ensure I got the properly configured fuse boxes for each of my components. If you have any questions, don't hesitate to send him a message, he's a real pleasure to deal with.

Vera-Fi Audio has quickly become one of my favourite Hi-Fi companies in 2025. Highly recommended!

I received fuses a month ago for three Pass Lab amplifiers used in dual amplification: two Pass 60.5 XA for low frequencies and one Pass 30.5 XA for high frequencies. After changing the fuses I can say that the swisse box do a very good job. At first I used them with gold sluggoes, already with very good results, at a later time I replaced them with graphene sluggoes (obtained on very good terms and being able to take advantage of an offer although I had bought them a few weeks earlier). Thank you Mark I appreciated this sales ethic in a profit-driven world.

I must preface this by saying that what convinced me to purchase, beyond the enthusiastic comments I read on these pages, was the logic behind this project. Those who, like me, compose their systems with countless electrical devices often get the result of both enhancement and degradation. In addition to EMI and RFI interference, ground loops, and noise generated by each device that is added, one should not forget the degradation caused by these funnels that are the fuses that actually multiply the bottlenecks in the acoustic signal path in proportion to their use: in my case a cascade of switches, a Clock, a streamer, a DCC, a converter, a preamplifier, and three power amplifiers. The project of removing these bottlenecks seemed to me a simple and enlightened idea to pursue the most neutral position, which is that of a device with the best possible power supply. I will give below some suggestions to eliminate in my opinion the risks due to the suppression of the physical fuse with the electronic one.

I waited a break-in of a hundred hours before moving on to a critical listening of the results obtained. Not only were the changes already convincing, but there was further obvious room for progress with the graphene sluggo version. After swapping the old Synergestic fuses (orange and purple in my case) for the swisse fuses with the gold sluggoes, I caught a better homogenization between the two frequency bands in the bi-amplification. Another rather noticeable nuance emerged in the spatial delineation of instruments, particularly voices. The previous fuses seemed to enhance the midrange or treble depending on the model, but at the expense of the edges of the instruments and voices, which found themselves no longer placed in a delimited space relative to other voices or instruments. In other words, it seemed to me that in the old fuses the greater efficiency was achieved at the expense of the separation and contours of the elements on the soundstage being less precise. With some recordings, such as Pergolesi's Stabat mater in Abbado's recording, the voices of Margaret Marshall and Lucia Valentini Terrani are now better separated and more similar to the reference obtained in headphones. With the graphene sluggoes the whole range and in particular the basses have improved in articulation, speed and in the case of the basses have become tighter and more dynamic. Very often we remedy one of these degradations by unbalancing other parameters. In other words, we correct an alleged imbalance by introducing other imbalances in a chain of errors that balance each other out. The temptation, needless to say, is to proceed with the elimination of the other bottlenecks, wallet permitting.

A word of advice to finish up : in the use of fused swisse in amplifiers or other devices with stand-bye set-up precautions are to be considered. Due to the fact that swisse fuses take a few seconds before the green light comes on making the defense of your hi-fi devices effective, following a blackout of the mains or home electrical panel, the stand-bye position could result in power arriving before the electronic fuse is activated. I therefore recommend that you take the precaution of turning the device off, wait for the light to change to green before putting it on standby.

Thank you in any case to Mark and his team for the pleasure this new listening brings me.
Alessandro

Very pleased with the Graphene Sluggo. Not fully cooked yet and might take a while longer as I don't leave my amp powered up, but the easiest way to put it is smooth with an increase of information. Pleased enough that I will be ordering for the rest of my gear in the near future.

Fantastic. Amplifier producing bigger sound stage and instrument separation. More resolution but not harsh. Less tense, more musical. Makes me want to listen.

Include instruction to handle graphene sluggo with minimum contact when installing

Purchased two of these. One for my integrated amp and one for my DAC. In the end, floored by what it did for the amp, opening up the air, solidified the bass kick and added lower mid-range weight. My DAC was another story, sound got hard edged and a little too shouty for my tastes. Another reviewer stated that someone may or may not like what it does. So, as the title suggests, take the time to listen to what it does before making a judgment. That said, another 5 stars for Mark at team at Vera-Fi. Answers email questions quickly, fought through the CA fires, and still did their best to take care of customers.

I wanted to share my impressions of the SDFB. I’ve ordered one SDFB (20A) for my Sanders Magtech power amp. I ordered the box with the graphene sluggos.

I’m using SR Research fuses in my entire system. Mostly Masters and some Purples. So below impressions are vs these SR Fuses and not vs stock fuses.

A difficulty here in Europe was the US socket on the output. I was only able to use the SFDB with the provided pigtail. This silver plated pigtail didn’t do it at in my setup. Timbre was synthetic and images were flat.

So I ordered a Schuko to IEC adapter. With the adapter I was able to connect the SDFB directly to the outlet in my power bar. Also, I ordered a US male to Schuko adapter for the output. Now I could connect any power cable at home finished with Schuko plugs. None of the adapters was „hifi-grade“. Just standard products from the electronics shop.

Using these adapters instead of the pigtail completely transformed my experience with the SDFB. I strongly advise anybody to use such adapters. I think Mark and the team are currently working on hifi-grade adapters With the adapter I was absolutely blown away by the result. The soundstage had increased a lot in terms of height, width and depth. Better than with the Master and significantly better than with the Purple. While the Master fuse tends to suck out lower mids, the Purple fuse emphasize this specific frequency range. So in combination this works but it needs attention and the willingness to balance things out. The fuse boxes frequency range remained neutral in the best sense. So there is no need to compensate anything in the process, like maintaining body and musicality with switch of cables, tube rolling, etc. It is thus a very clear improvement over both SR fuses.

Also seperation was clearly improved without loosing musicality.

The timbre was phenomenal: organic and natural. The sound had body and heft if the recording allowed for it. With leaner, airier recordings, it was open and spherical. There was a significant increase in micro and macro details.

The fact that the fuse box outperformed the SR Master and Purple in my amp, makes it very appealing. Also, fuses have blown in the past increasing the costs.

After the positive experience, I ordered more SDFB to upgrade the entire system. I observed the same improvements with every change. Maybe just slightly less of it the more I swapped but every single upgrade was very well worth the price.

I can strongly advise anybody to check these out. These are a phenomenal improvement for a very fair price.

Really impressed by the addition of this box and a graphene "fuse."
A wider and deeper soundstage, instrument separation with fuller bass and crisp treble, and much more detail.
Installed on my Nadac Merging, I've ordered a new one for my amp.
Thanks, Mark.

Replaced all fuses in my system, about 10 in total. A very worthy investment. Thank you Mark