Review and Measurements of Purifi 1ET400A Amplifier

[KSTR]

[...]
How do my speaker wires and speaker react, in the audible band, to the high frequency signal presence? I do believe we’ve covered that in a few other places and concluded there should be no audible artifacts, but perhaps we missed something.
[...]

If anything, it might add some dithering effect which normally is a positive thing... in case it is real, actually.
This could be blind-tested with a normal A/B amp, decoupled with a coil from the speaker, and injecting a 500kHz sine after that, capacitively coupled, from an AC (appoximated) current source.

 

[Soniclife]

Your comments there essentially question Brunos honesty along with his technical ability. Considering your continued penchent for spamming multiple threads with uninformed nonsense despite multiple warnings, I am of the opinion you should be given a permanent holiday from the forum.

@Thomas savage ?

Seconded.

 

[renevoorburg]

Btw, did you notice that https://www.purifi-audio.com/ now has a shop area? It only shows a woofer, and the shop doesn't seem to be working yet.

And the shop is gone again... Makes some sense since it clearly wasn’t ready yet. Would really like to know the price of the DIY Eigentakt.

 

[Julf]

Seconded.

Thirded.

 

[BreakingBad]

Nord's implementation is Bad! Quoting my buddy Mike from Mivera audio :

I can't believe he's using cheap Chinese unshielded what appears to be 18-20g AC mains wire. But that's not the worst part. He's running the hot (brown wire) not only through 10-15x the amount of cable as the neutral, also through a very high loss, low current capable push button switch on the front panel. Those tiny low current contact in that switch are not designed for this kind of current. Then you can see that cheap IDE ribbon cable that was designed for old school hard drives, CD drives and floppy drives carries the super noisy aux power from the Hypex supply to his buffer board. The Sparko opamps (which were the worst sounding 990/2520 format discrete opamps I ever tested) are installed in his buffer.
And the Sparko regulators share the duty of powering them and the modulator board that is sticking up on the side of the Purifi module. On the Puribuffers that board gets its own dedicated dual supply. Same with my gain stage. Speaker wire looks like Neotech copper which is good. But nowhere in the league of the OCC silver. And at 10x less cost it should be expected. Speaker binding posts are Chinese brass, with tin ringlets tightened on with brass nuts.
But guess what, not a single person besides me would ever notice any of those things. And the worst part is the Purifi modules themselves, are going to be judged based on implementations like this or worse.

 

[g29]

Nord's implementation is Bad! Quoting my buddy Mike from Mivera audio :

I can't believe he's using cheap Chinese unshielded what appears to be 18-20g AC mains wire. But that's not the worst part. He's running the hot (brown wire) not only through 10-15x the amount of cable as the neutral, also through a very high loss, low current capable push button switch on the front panel. Those tiny low current contact in that switch are not designed for this kind of current. Then you can see that cheap IDE ribbon cable that was designed for old school hard drives, CD drives and floppy drives carries the super noisy aux power from the Hypex supply to his buffer board. The Sparko opamps (which were the worst sounding 990/2520 format discrete opamps I ever tested) are installed in his buffer.
And the Sparko regulators share the duty of powering them and the modulator board that is sticking up on the side of the Purifi module. On the Puribuffers that board gets its own dedicated dual supply. Same with my gain stage. Speaker wire looks like Neotech copper which is good. But nowhere in the league of the OCC silver. And at 10x less cost it should be expected. Speaker binding posts are Chinese brass, with tin ringlets tightened on with brass nuts.
But guess what, not a single person besides me would ever notice any of those things. And the worst part is the Purifi modules themselves, are going to be judged based on implementations like this or worse.

Got a topless picture of the Mivera Purifi amp for comparison ? The ribbon cable looks like the stock Hypex PS cable.

Update: Just checked out there website. I guess I need a SAP clearance level to view the products they are selling.

 

[Willem]

First post. And Mivera's Mike is your buddy? A competitor therefore.

 

[boggit10]

I see you joined today to post a hatchet today!
Mike From Mivera who builds his own Purifi Amplifier who gets banned from most forums, who has never seen our amp. We have sold 3 one going out today none to the US or Canada where he is based. He is sore at our success I guess after helping with the concept of the buffer 3 years ago!

The front switch is from a specialist UK switch supplier RJS Electronics and is rated at 21A vastly over specified, we have hundreds in the field over 2 years with out a single issue.

Cheap IDE cable, Hypex's header off the SMPS1200A700 PSU Aux power on the PSU will only accept ribbon cables it is the connection to use! All manufactures use this.

Binding posts are from CHK a UK based company and are used on Chord Electronics £30K Mono Block. WBT's are optional

As to Op amps we supply Sparkos or Sonic Imagery we tested many and found these 2 by far the best but I guess it just adds noise to the hatchet job
PS Mike has contacted me and assures me he is not his buddy nor is he behind the comments.

 

[boggit10]

Bel Canto's £5250 Ref600m NC500 with inferior IC based buffer, note the ribbon cable from Aux PSU

 

[boggit10]

CHK Binding posts on the £30K each Chord ULTIMA 780W mono block I think if they are good enough for them.......

 

[Samoyed]

Colin, we know the Tiger by his stripes. Keep on keeping on....

 

[Matias]

Update: Just checked out there website. I guess I need a SAP clearance level to view the products they are selling.

Yes, he got paranoid that everyone is going to copy his next amplifier and decided to restrict access to customers only. Bad move, imo. Could have let an open area for discussion and a private area for his precious trade secrets. Oh well.

 

[HammerSandwich]

...the £30K each Chord ULTIMA 780W mono block...

Forget the binding posts. For that money, I'd want the heatsinks to be aligned perfectly.

 

[g29]

Yes, he got paranoid that everyone is going to copy his next amplifier and decided to restrict access to customers only. Bad move, imo. Could have let an open area for discussion and a private area for his precious trade secrets. Oh well.

It is an odd marketing model that I have never come across before. Apparently you have to buy a used piece of equipment, then trade it in for a new piece of equipment to learn the secret handshake. This means his customer base will never grow more than his used equipment inventory available on the E-Shelves.

 

[ahofer]

Wasn’t he the guy who was dumping on March Audio through a sock-puppet account here?

 

[boXem]

... inferior IC based buffer...

Inferior? Why?

 

[maty]

https://www.apollonaudio.com/purifi-1et400a-apollon-audio-monoblock/

Optimized

Two monoblocks: 2.380,00 € (ex. VAT)

To Tarragona (Spain, EU): + 65,00 € + 476,00 € = 2.921,00 €

 

[maty]

The same box than NC500 monoblocks -> two short ventilation slots - above and below?

Optimized an very clarified

https://www.audiosciencereview.com/...ements-of-nord-one-nc500-amp.7704/post-230789

NC500 stereo, rear

 

[SDC]

But nowhere in the league of the OCC silver.

Do we really need that silver stuff?

 

[VintageFlanker]

Speaker wire looks like Neotech copper which is good. But nowhere in the league of the OCC silver. And at 10x less cost it should be expected. Speaker binding posts are Chinese brass, with tin ringlets tightened on with brass nuts.

In the league of what?
Ask Benchmark if they put OCC Silver in their State of The Art AHB2.