Purifi Class D: Junk?

Maybe we should use a new word for people like this. How about Anti Snake Oiler or ASO.

@ricevs , that is a good one :-). Assuming that george is the biggest ASO and he complains on fuses and other stuff like modding. But what surprises me is the -ve bias against Purifi and other class D modules that have come up recently. The folks on ASR have shown with measurements how good the Purifi module is and the potentials it has. Subjectivists and objectivists both agree on this one. It looks like he has "personal" agenda/motive against Class D. The only thing I could think of is that maybe Class D amps do not gel very well with his attenuators and hence is trying to discredit them? Not sure. Beats me.Well known designers still have to make a living and not run a charity. Why would they promote other designs over their own? And the quotes that they made, which george often mentions, are from "how long ago"? Technology changes, so we should see improvements in the new Class D amps, compared to the ones from a few years ago.

And we're still waiting for the LSA Voyager, which should be out soon, perhaps even before that $9500 Technics.

Almost all tube manufacturers....they pick caps, etc. by ear....and they don't measure any different.

This statement is false- they do indeed measure differently (whether some companies bother to measure the differences is a different matter). We use custom made resistors as well (made by Caddock); they sound better but they also measure better.

Most equipment stand manufacturers......I mean, can you measure a better stand?

Certainly! Sound Anchors was measuring the differences in performance of their stands 30 years ago. Its not hard.

More like calling you out, on your snake oil mods, that you don’t backup with any measurements, just a fusers "trust me it works"

Its easy enough to measure the effects of a fuse, and the different fuses. Its not rocket science either. All you need is a DVM. Having said that I'm personally not a fan of boutique fuses. At least one of them uses a Teflon tube to 'damp' the fuse element. The problem is the fuse actually has to blow in order to protect; this type of fuse can have the metal of the fuse element go liquid and finally to a plasma state simply because of that Teflon tubing in which its held. Such a fuse will not reliably fail at its rating, and thus we don't recommend them.

Its easy enough to measure the effects of a fuse, and the different fuses. Its not rocket science either. All you need is a DVM.

Hi @atmasphere

Can you illuminate me on what types of differences, among equally rated and types of fuses you have encountered?  How precise did the DVM have to be for you to measure it, and what qualities do you look for?


Best,

Erik

I am sure that changing a part here and there could change a measurement. However, this us not the usual case. You can take 10 different brands of normal metal film resistors and they will all measure the same.....and all sound different (I have done this).......maybe a non inductive Vishay or Caddock could change a measurement....but most things cannot.....and this includes brands of solder.....that also....all sound different. Yes, there are certain measurements you can do with a component stand that will be measurable.....However, there are no agreements as to which measurements mean what sonically and which component stand sounds best with which component. In fact, some people prefer to "add certain natural resonances.....to enhance the sound" Fuses all sound different and you cannot measure all the sonic differences with a meter of any kind. The only meter that matters is your ears. I have never seen anyone state that good film caps measure differently (certainly, ceramic,Tantalum and Electrolytics should never be used in the signal path).......yet all types and brands of film caps sound different. Please, use your ears.

Here is a good one. I bypassed a fuse with a 12 gauge wire soldered across the fuse solder on its inside bottom (fuse holder was a board mount fuse jobbie). It made an impressive improvement over the stock fuse. However, the tabs that normally would hold the fuse up slightly in the air were still sitting there......and I figured they might be adding some resonance. So I broke off these 4 tabs and the sound was noticeably improved. Measure that!!!!! This game is not simple....it is infinite....enjoy the infinite.....it is all there is......and it is infinite love and joy.

Here is another good one.  Years ago it was said the Nichrome thin film surface mount resistors were the bomb.  So, I bought 4 different one eight watt 75 ohm resistors from Mouser and tried them on the output of a low jitter clock.  These things are so tiny you can hardly see them.....and they all look the same except for color.  But all four brands sounded different.....one being way bad and one being way good.  I still use the way good one today.....but now I use the quarter watt versions and parallel them for best sound.  Did i say this game in infinite?  Cannot say it enough.