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.