Buckeye Amps: 2nd Generation Purifi EIGENTAKT 1ET9040BA Amplifier

[yys310]

I am sorry, but in my opinion your plots show either wiring or measurement error. One needs to avoid any capacitive ground currents (use optical fibres and/or isolation power transformers to supply PC).

Already use SPDIF to the DAC. I guess that's also isolated good enough? The DAC (D90III) to MOTU shows nothing on the spectrum.

And, MOTU is far from perfect device. Purifi modules are free from any spuriae in the audio band, if properly wired and measured. BTW, I do not use LPF filter for measurements.

Yeah MOTU's ADC aren't that good and I can see it in one of the module so that's even more concerning.

This tone at about 18kHz smells a lot like a HVAC ot something like it.
I have seen it time and time again when not using my dedicated electrical phase.

But it's strange that both modules are in the same aluminum chassis and I tried to swap the modules power supply, 20pin front end cable, mounting position and it is still the same one that has this behavior.

All these very low level measurements need extra care. We are talking about sub microvolt voltages.

Yeah...perhaps I should just forget about it. I think it won't be audible...

Do you have a monitor nearby that could emit this frequency?

I have a monitor nearby but if that's the case I think I'll see that signal in both modules right?

I'll try to measure it using cosmos ADC in the future. Right now the modules seem to work fine. They sound fantastic regardless of the strange peak anyway.

 

[restorer-john]

But it's strange that both modules are in the same aluminum chassis and I tried to swap the modules power supply, 20pin front end cable, mounting position and it is still the same one that has this behavior.

It will be 16kHz and that's a byproduct of USB. Your interface (whatever it is) and grounding (or isolation) will be the issue.

 

[yys310]

It will be 16kHz and that's a byproduct of USB. Your interface (whatever it is) and grounding (or isolation) will be the issue.

Somehow it only shows at one of the module.
Swap both modules to the same SMPS and same signal input it's still the same module that shows the HF noise.

 

[pogo]

I have a monitor nearby but if that's the case I think I'll see that signal in both modules right?

No.

 

[yys310]

No.

So the interference source will identify certain module and only interfere on it.

 

[McFly]

16kHZ is USB noise. Try different, longer or shorter cables.

 

[Buckeye Amps]

The Micro Audio SMPS1k-SN power supply upgrade is now available to be added during checkout on the website. ETA for the Micro Audio SMPS is 4-6wka but you can preorder now.

 

[JGQC]

The Micro Audio SMPS1k-SN power supply upgrade is now available to be added during checkout on the website. ETA for the Micro Audio SMPS is 4-6wka but you can preorder now.

Who would benefit most from that kind of upgrade Dylan? Thanks!

 

[Buckeye Amps]

Who would benefit most from that kind of upgrade Dylan? Thanks!

Those wanting as much power as possible for under 4ohm loads.

The Micro Audio SMPS is also going to be better for continued power output (Sami stresses his designs thoroughly)

 

[shion_ca]

Those wanting as much power as possible for under 4ohm loads.

The Micro Audio SMPS is also going to be better for continued power output (Sami stresses his designs thoroughly)

I think to take advantage of it you’d have to be running high gain likely and then you’d get the 200 watts extra into two ohms…. You can work out how much louder that would be on 89db speakers…. I’m not sure if it’s be audible?

 

[Buckeye Amps]

I think to take advantage of it you’d have to be running high gain likely and then you’d get the 200 watts extra into two ohms…. You can work out how much louder that would be on 89db speakers…. I’m not sure if it’s be audible?

Of course. It is mainly, like the 9040 itself, a good option for those who want the best regardless.

 

[McFly]

Hi Dylan, you posted measurements a ways back with the MA PSU, and mentioned you were going to also post hypex measurements. Is that still the case?

 

[Buckeye Amps]

Hi Dylan, you posted measurements a ways back with the MA PSU, and mentioned you were going to also post hypex measurements. Is that still the case?

Yes. Want to get the AP situation sorted first. And then do a proper side by side measurement of the Hypex and Micro Audio (again)

 

[Reddoc]

Dylan, congrats on your business model and the way you conduct yourself here.
I see they are both "2nd generation":
What is the difference between the 9040 and the 6525 in terms of overall mechanism of amplification and secondly in terms of measurements?
The 6525 seems hard to track down
thanks a lot!

 

[AudioGuyinCanada]

Hello All from Canada,
new here, and newer to audio....signed up as a result of this thread while researching the offerings on the Buckeye website

I have a question for Dylan at Buckeye that I thought might be better posted here instead of direct email so others in my shoes may benefit somewhat

Dylan I'm seeking a fast and energetic sounding amp.

I was looking at a pair of your Hypex NCX500 monos until I discovered your 1ET9040BA mono option

Can I expect the Purifi to be better for speed and liveliness? Am I even on the right path considering either option in my search for a fast sounding amplifier?

Please forgive my lack of technical knowledge and descriptions and thanks in advance

 

[ahofer]

Hello All from Canada,
new here, and newer to audio....signed up as a result of this thread while researching the offerings on the Buckeye website

I have a question for Dylan at Buckeye that I thought might be better posted here instead of direct email so others in my shoes may benefit somewhat

Dylan I'm seeking a fast and energetic sounding amp.

I was looking at a pair of your Hypex NCX500 monos until I discovered your 1ET9040BA mono option

Can I expect the Purifi to be better for speed and liveliness? Am I even on the right path considering either option in my search for a fast sounding amplifier?

Please forgive my lack of technical knowledge and descriptions and thanks in advance

You will find these amps to be audibly transparent, thus sound the same as other amps with low output impedance, linear frequency response through the audible range, low noise, and ample power reserves. You will be delighted with the size, low energy use, and lack of heat of the design. You may also enjoy working with a company like Buckeye and a responsive entrepreneur like Dylan.

Unfortunately, any “fast” qualities, relative to other well-designed and adequately powered amps (and between these fine amplification modules), would come from somewhere downstream of your electronics and possibly even your speakers. Once you have a decent amp, searching for sound improvements with amplifiers is a waste of time.

Some here assert that the Hypex modules may not be as reliable over time. We haven’t seen adequate evidence for or against that. I have both and they are both going strong (Hypex>5 yrs), but that’s just my anecdote.

 

[shion_ca]

Hello All from Canada,
new here, and newer to audio....signed up as a result of this thread while researching the offerings on the Buckeye website

I have a question for Dylan at Buckeye that I thought might be better posted here instead of direct email so others in my shoes may benefit somewhat

Dylan I'm seeking a fast and energetic sounding amp.

I was looking at a pair of your Hypex NCX500 monos until I discovered your 1ET9040BA mono option

Can I expect the Purifi to be better for speed and liveliness? Am I even on the right path considering either option in my search for a fast sounding amplifier?

Please forgive my lack of technical knowledge and descriptions and thanks in advance

Are you in the Toronto area?

 

[AudioGuyinCanada]

yes

 

[ahofer]

Alright I broke down and used audiophile terms, feel free to have at me all

It’s the comfy chair for you.

 

[Julf]

Dylan I'm seeking a fast and energetic sounding amp.

Can I expect the Purifi to be better for speed and liveliness? Am I even on the right path considering either option in my search for a fast sounding amplifier?

"Speed" and "liveliness" are nonsense words cultivated by the audiophile press. What they tend to mean is actually a certain amount of coloration and distortion, and if that is what you like, the Purifi will probably be a disappointment for you, as it is simply neutral and transparent.