The PWD to DS retrofit kits came with specialty fuses (I do not recall which) but I do not know if any other products come with special fuses. I also do not know the degree which the fuses were vetted.
Does anyone know/recall?
Yes, the DirectStream upgrade kit comes with specialty fuses, however… Paul McGowan and PS Audio nowhere claim that these are “The Best”. They are no doubt better than regular hardware store Buss fuses oe whatever, but they are still unlikely to cost more than one or two dollars wholesale. I can’t name any manufacturer that includes $100+ fuses as standard equipment, and if any do then the equipment almost certainly retails for many times more than the $6000 price tag of the DirectStream DAC. This would be limited to true Boutique Products that are built to order and may ship a few to a few dozen units a year.
Specialty products are just that, purchased and applied at the discretion of the end user. Some things like fuses are cheap enough to try, and I became an instant believer when I first tried a set of fuses in my PerfectWave DAC a few years ago. Other tweaks such as the Bybee Products don’t cost a whole lot more and may well be worth a try, even if the marketing material is questionable. Yes, they do set off my BS detector, and I would prefer a simpler"we’re not sure how or why" as does Elk. At least some of their marketing seems to read as vaguely scientific as opposed to the pure BS that many audiophile tweaks use. One favorite example that sticks in my head is that of Shakti. I doubt that they will ever see a penny from me even if they were to reduce their prices tenfold, because their marketing material really is pure BS and makes my BS detector drown out my considerable (is this ringing in my ears bothering you?) tinnitus. Take away their BS and their prices are still in Audiophool territory, charging seemingly thousands of times real production costs for products that at best look to me to be marginal.
Try it or not, that is your choice. State that you think that they are silly… Sure. State that you don’t hear anything and/or don’t think that there can be any audible benefits, but don’t tell someone else that they are not hearing what they are hearing. You may suggest expectation bias, but you cannot know what they actually hear - only they can.
OOPS!!! I seem to have gotten up on my soap box. Please feel free to take with a large grain of salt. 
J.P.
A high quality rant.
The Shakti Hallographs are highly suspect, but have garnered many positive reviews. I choke on both the proffered claim as to what they do, as well as dislike the co-opting of Hinduism’s terminology. And their prices are obscene.
I never looked into the Hallographs. My reason, I realize in retrospect, was that they’re so stupid-LOOKING. Pretty shallow on my part - and it’s not like I make ANY effort to make my stereo area look good.
This is despite the fact that I believe that SOME forms of devices that alter/interfere with/resonate/absorb/reflect/diffract, etc. sound - especially in room corners - actually make changes in the sound, for good or ill.
They certainly attract/distract/refocus your attention visually, which is something a number of “devices” do these days, including infinitestimal bits of cork and so on. Sometimes I think one of the effects of these objects placed around the room/stuck to the walls, etc. is that one “listens harder” in order to detect the subtle changes - which may or may not have occurred outside the listener.
Bybees vaguely scientific descriptions are arrant nonsense, if you ask any physicist. His statements that he can’t patent his technology because it is classified, yet he is allowed to sell the tech to consumers, have no credibility.
Search for “Brilliant Pebbles hi-fi” to find an obvious scam that makes as much sense as Bybee products. One would have to be far more credulous than I to bother wasting time or money on them.
badbeef said I never looked into the Hallographs. My reason, I realize in retrospect, was that they're so stupid-LOOKING.As good a reason as any. :)
EldRick said Bybees vaguely scientific descriptions are arrant nonsense . . .Everyone here appears to agree. But, as Paul noted earlier, Jack Bybee's products seem to work. But the descriptions are as ridiculous as those used for marketing cables - which most of us here acknowledge make a difference, despite the nonsensical marketing copy.
Search for "Brilliant Pebbles hi-fi" to find an obvious scam . . .Geoff Kait's Machina Dynamica products have always been a hoot. The Brilliant pebbles are classics, but my favorite is the Teleportation Tweak
He’s probably sold thousands…
6^)
I would like to know. He has been around for years, is active in various forums, appears thoroughly convinced in what he is offering. He must sell some of his offerings.
By the way, I enjoyed reading the word arrant in your earlier post. An uncommonly used word, but you employed it perfectly.
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Can anyone tell me how many fuses and their values are in the DSD DAC, please ?
1A small (5x20mm) slowblow (t) for the DSD Dac you need to replace the fuse on the one I seem to recall labelled digital. The other is not used (though I still wish I would have removed the spare fuse there just to see if it all powered on and worked)
So just to be clear, 1 fuse that needs to be changed the other is not used and considered spare.
Thank you Elk.
I will be replacing my DSD and BHK Pre fuses with SR Reds or Blacks.
SR just came out with a Blue fuse that may be worth considering. Supposed to be their new top of the line.
Perfect! I think we have the perfect tester!
Managed to open my DSD DAC today for upgrading the fuse.
There are 2 pcs T 1A fuses, only the digital fuse is in use, analogue is spare with 120 vac present at the clip on fuse holder.
I have now upgraded the digital fuse with the SR Red T 1A slow blow.
Here are some pictures: 
Terryakhan,
Out of curiousity, you were able to remove the analogue one and it stopped working? My understanding has always been from every post I read in here that the analogue is not used in the DSD Dac.
The Analog fuse isn’t used and is indeed a spare. The “Digital” fuse protects four supplies, one of which is used for the analog card. Feel free to test by removing the “Analog” fuse.
My apologizes Veneet and all please, my mistake, corrected my post.
Yes only the Digital fuse is active, the analogue fuse is spare. I just double checked and will be labeling it for future owners.
Measured 120 vac on the analogue fuse, surely, I thought it was in the circuit.
No apologies required at all!
I am actually happy that you checked, its been in the back of my head forever, wishing that I tried taking it out when the cover was off!!
Hi, guys.
I’m thinking about replacing my DSD’s fuse but I got confused because there’s no outside fuse holder and no fuse indication in the manual too.
Could someone please tell me what’s the fuse characteristics and show me at least a photo where is it located inside DSD?
By the way, my mains are 220VAC where I live.
Thanks in advance!
Go here to our How To and it’s the same for DirectStream http://www.psaudio.com/ps_how/how-to-change-fuses-in-a-pwd-or-pwt/