I’m a little shaky on the idea of fuse directionality, but for those who have swapped out fuses on the PST, is there a consensus on which way the juice is flowing? Should I point the fuse toward the chassis or away from it?
Thanks.
PS Audio claims that the direction of the fuse should be from the back of the unit towards the front.
Thank you!
You still have to swap the fuse to find the direction that is best for you. There is no guarantee the sticker on the fuse indicated the direction of the fuse.
Either direction is better than your old fuse but one direction is clearly better. So don’t be lazy.
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This is what I recommend to most folks as well. Almost all of our gear is form the back to front though.
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On another note, you need to add one fuse at a time . Find the best direction of a fuse for one component, then move on to the next component and repeat this process.
Or not.
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That thought of shutting down the system so many times to try is too much for me to bear. I put in three at the same time.
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I didn’t take photos, but applying the isodamp went pretty well. I put it down on two pairs of rails on the disc drive, or four total areas where gravity is most at play. The same album (where my original OCD triggered) now allows for thoughts of successful mechanical motor noise reduction in those somewhat rare, super quiet situations that, at least classical and female vocalists, still incorporate with regularity. Also, I think my proximity to the PST is shorter than some might enjoy. Pleased.
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Exactly what I did. Three Purple pills swallowed at one time and wait to see what happens. I don’t have the patience to slog through individual swaps or wait for days on end to see the light.
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I got lucky. I put four purple fuses in at once and I couldn’t be happier with the sound. I put in the fuses the directions recommended by most people. The fuses make a nice improvement especially over stock fuses.
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My measurements in the past have shown the opposite.
The flow of power is from front to rear.
To show visual evidence of this I have done the following.
I soldered three fuses together in series. This gives extra length to both make contact at the front where the fuse makes contact and easy access to measure voltage at the rear.
As you can see I measure 123.3 V at the other end of the fuse. If the flow was from the rear to the front I would expect to measure 0 V at this point.
These pictures are on the Direct Stream Memory transport but I did the same experiment on a P 10 powerplant with the same results.
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Good bad or ugly my system sounds good. I could easily enough switch the fuse on either my PST or my Aries streamer but “If it ain’t broke …”
That’s the way things sound best to me in the PST and the P15.
I was just told by The Cable Co that the directionality of the Purple SR fuses is quite unpredictable…
Do you like the fuse facing to the front of the PST or facing towards the back against the advice of PS Audio?
Apparently the flow of current is unpredictable on our gear as well… 
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SR going from the interior to the fuse plug end.
Here is a question that I posted on a’gon a few days ago.
Lately I’ve been looking at SR Purple fuses. I spoke to a dealer who recommended going with higher amperage. This is because, supposedly, boutique fuses are built to tighter specs than conventional fuses. But he also told me that there are sonic benefits to using a larger fuse.
I had never heard this before but it got my curiosity up. So I dug out a spare 3.15a fuse and installed it in the PST. My fuses are all HFT Supreme. I’m using a Shunyata and there were no signs of thunderstorms so I figured I was safe for a couple hours with the larger fuse.
I was amazed by the change. The bass went much lower and was more authoritative and controlled. The highs were more clear and shimmering. And overall the music was just more musical and engaging.
Being risk averse, I switched back to the 1.6a fuse, but not before digging up the stock fuse in order to compare that to the HFT 1.6a. The result was the same. The stock fuse was sonically very similar to the small HFT and unlike the larger HFT, suggesting that the 1.6a HFT fuse is not defective in some way.
Is this a known phenomena in audio? Does a slightly higher amperage fuse change the characteristics of a component?
And what should I do about the SR Purple? If I go that route, should I buy a higher amperage? How much higher? And would that have repercussions for the warranty? I prefer to stay on the safe side, but would rather not blow a $200 fuse if I can avoid it. Word on the street is that these SR fuses are prone to blowing.
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Very interesting observations.