PURIFI amps : Group Buy finished amp + Buffer OPA1656 : free shipping to Europe.

[daniboun]

Hi amigos,

I propose this group Buy for a brand new Purifi Amplifier with a Custom Buffer using OPA1656 DIP8. So : you can "custom" your sound with your favorite DIP OP amps.

This Purifi is made with good quality components and H2000 Case, made in Italy.
The amp is fully balanced and available in Grey and Black with 10mn front panel.

Free Shipping in Europe only please via DHL. (I can't sell outsite Europe)
Best price in Europe = Audiophonics = 1500 euros without OPA1656 )

My price : 999 euros with OPA1656 if I sell at least 4 units.


Spec :

Fully balanced
Dual 1ET400A Purifi modules
Hypex SMPS1200A400 PSU
Neutrik XLR inputs
Sommer Cables Germany
Custom Buffer OPA1656 DIP8
Second alu plate for heat dissipation


Buffer Spec :

- THD: 0,00026% @ Vin 2,5 V RMS
- GAIN: 14 dB
- BANDWIDTH: 2 Hz - 150 kHz
- SLEW RATE: 24 V/uS
- CMRR: > 100 dB @ 60 Hz
- DYNAMIC RANGE: 127 dB
- INPUT IMPEDANCE: 47 Kohm
- NOISE AND HUM: 6 uV
- SIZE : 62mm x63mm
- OP AMPS : OPA1665 (DIP 8)
- POWER SUPPLY: +-12V TO +-18V

Video :

https://streamable.com/qi88kr

Pictures :

 

[ronwan]

Am interested.. count me in.

 

[daniboun]

Am interested.. count me in.

Nice, where are you from by the way ?

 

[litemotiv]

@daniboun Also interested in this build, located in The Netherlands

 

[as-lot]

@daniboun I might also be interested. Can you say a little more about the custom buffer?

How does it differ from the EVAL1, other than the OPamps. Why did you build your own, and what are the trade-offs?
Any advantages and/or disadvantages?

Thank you in advance.

 

[as-lot]

From the pictures it also looks like there's an additional unit between the power and the LED. What is this for?

 

[daniboun]

From the pictures it also looks like there's an additional unit between the power and the LED. What is this for?

Yes, it is a Micro SMPS unit to power on the Power ON led. To avoid any "stress" from the Hypex PSU

 

[daniboun]

@daniboun I might also be interested. Can you say a little more about the custom buffer?

How does it differ from the EVAL1, other than the OPamps. Why did you build your own, and what are the trade-offs?
Any advantages and/or disadvantages?

Thank you in advance.

The Buffer is design and made in Italy, PCB comes from Germany.
I wanted to propose a Purifi with a fair price, the Buffer is as good as the ATM and close to other ones.
It is fully balanced and easy to setup as you can see, It is rather flexible car it can be installed in any case, it is using JST type connectors.
As for the rest, I shared the spec in the description.

 

[daniboun]

Here the order update for the moment :

Ronwan > 1 Purifi

 

[Deleted member 65]

You’ve got any RFI/EMI filtering implemented on your input buffer?

 

[daniboun]

I have a RMI/RFI filter @ IEC AC input.

 

[as-lot]

the Buffer is as good as the ATM and close to other ones.

ATM is ATM-audio?

I don't think you mean this one: https://atm-audio.com/input-buffer-for-hypex-and-purifi-audio-with-triode-korg-nutube/
The only one for Purifi I see there.

 

[TimoJ]

I have a RMI/RFI filter @ IEC AC input.

It's recommended not to have IEC input filter. And using that extra power supply for just the LED is silly. Power it from 60V lines if you are worried that 15V lines can't handle it.

 

[boXem]

(I can't sell outsite Europe)

You can't sell in Europe either.

 

[Deleted member 65]

What @TimoJ said, without proper filtering on your board you may encounter this https://www.audiosciencereview.com/forum/index.php?threads/diy-purifi-amp-builds.10478/post-742130

 

[daniboun]

It's recommended not to have IEC input filter. And using that extra power supply for just the LED is silly. Power it from 60V lines if you are worried that 15V lines can't handle it.

I Know, will change it in next version. But this does not affect the quality of the amp)

 

[daniboun]

You can't sell in Europe either.

Why ? explain

 

[daniboun]

What @TimoJ said, without proper filtering on your board you may encounter this https://www.audiosciencereview.com/forum/index.php?threads/diy-purifi-amp-builds.10478/post-742130

I tested the amp in many situation and got no RF Phone issues when I stream with my Phone or other wireless units. The amp is clean , 0 noise even when I glue my ears to the speakers. (good shielded cables help on it) Tested it with 3 different DACS and sounds awesome.

 

[renaudrenaud]

Why ? explain

I guess you're not a pro with juridic status. You're just offering something without any European warranty. The second power for one led is really silly. I am not sure you understand everything you do except connecting cards together. With perfect understanding you should not use this route.

I do not want to be aggressive, it's just my feelings and I hope I am wrong.

 

[daniboun]

I accept all positive feedbacks. No worries )
I think I end this group buy because I have rather negative encouragement.

By the way as you said, I am not a Pro.