Buckeye Purifi Eigentakt 1ET9040BA monoblock power amplifier Stereophile Measurements

[Bjorn]

I think this comment is just referring to the minuscule improvement (and zero audibly) of the new module,can't see any underlying doubt about quality.
@Bjorn ?

Mainly that.

However, we do test every single Vera Audio P150/600 RS and P400/1000 amp and it isn't released unless it meets strict measurement standards.

Customer can ask for measurement of his specific unit if he wants to. We have all the data ready when it's built and packed and keep also record of it.

 

[amirm]

I think I made clear that is just me being me,just a preference.
It may mean nothing to others,I talk only for myself,I don't preach

I commented because you seem to think there is a difference there. Those labs are certified by regulatory entities to have identical compliance to any other lab so situated. It makes no sense then to say you have a preference for one lab location over another.

 

[Sokel]

I commented because you seem to think there is a difference there. Those labs are certified by regulatory entities to have identical compliance to any other lab so situated. It makes no sense then to say you have a preference for one lab location over another.

..hence the "paranoid"
I just want them within my reach and I suppose any other feels safer feeling the same,wherever they may be.
That's partly because I have seen things,not audio related though (ships) .

And to tell the whole truth I was probably misguided by Micro's "from",as Jordan is closer to EU than China.
I stand corrected if that's the case.

 

[amirm]

That's fair. I have looked at their reports, gear they use, licensing they have to operate under major EU/US companies to run their testing and I see no reason to be worried at all. As I mentioned, they are good enough to satisfy US/EU regulator requirements so can't ask for more.

 

[pma]

Hello all, first, let me wish you Happy Christmas Holidays! And then, a little back on-topic.

I would like to return to maximum available power from Purifi modules with respect to SMPS used, module used, and frequency. My plots are based on 1ET400A + SMPS400A180 measurements, as I have nothing else here, however, I am quite sure that the results can be extrapolated to another Purifi and SMPS modules as well.

As a start, we have datasheet plots of output power vs. supply voltage, which says:

With 2 x 45V PSU voltage, the graph says we shall get 100W into 8ohm at 1% THD, signal frequency is not specified. My SMPS400A180 gives 2 x 48V with Purifi module at idle and about 2 x 46V at maximum power with 1% THD.

First, measurements of distortion vs. output voltage into 8ohm at 20Hz, 1kHz and 10kHz with measuring bandwidth 45kHz:

As we can see, the maximum power varies with signal frequency, and is highest for 10kHz and lowest for 20Hz. Where is the reason, is it the SMPS or Purifi module? We need t investigate SMPS rail voltage with the module operating near its maximum power.

1) at 1kHz we get this record of SMPS rail voltage:

DC voltage is almost 46V and the rms ripple voltage is about 0.5Vrms.

2) at 20Hz we get this record of SMPS rail voltage:

DC average voltage is 46.4V and rms ripple is 1V. So yes, minimum SMPS voltage seems to drop lower than with the 1kHz signal.


Finally, the record from 1ET400A at 20Hz and approximately 1% THD:



We get 104W/8ohm/20Hz with 34.5 dB SINAD and 41.14 dB SFDR, so we are close to THD 1% and also close to datasheet plot here above. Regarding dependence of maximum power on signal frequency, in my opinion both the Purifi module and the SMPS play their game here. It is evident that we get most power at high frequencies (at 10kHz we get 32V/8ohm, i.e. 128W/8ohm with THD<1% !), though the difference is unimportant regarding perception.

 

[Hiten]

Newbie post.
While measuring max power output can we measure current drawn ? So we can evaluate if smps can supply sufficient current for rated output ?
Thanks.
And Merry Christmas to everyone.

 

[Holmz]

Newbie post.
While measuring max power output can we measure current drawn ? So we can evaluate if smps can supply sufficient current for rated output ?
Thanks.
And Merry Chrisymas to everyone.

Is the SMPS a current source device, or more of a voltage supply device?

 

[Doodski]

Newbie post.
While measuring max power output can we measure current drawn ? So we can evaluate if smps can supply sufficient current for rated output ?
Thanks.
And Merry Chrisymas to everyone.

Do you mean current to the load or current drawn in total?

 

[pma]

Is the SMPS a current source device, or more of a voltage supply device?

Voltage source.

 

[pma]

Newbie post.
While measuring max power output can we measure current drawn ? So we can evaluate if smps can supply sufficient current for rated output ?
Thanks.
And Merry Chrisymas to everyone.

Yes we can, however at higher power the current drawn from the PSU is almost identical to load current, with some HF content.

 

[Hiten]

doodski,
Current drawn from the power supply. so as we can be sure the power supply is capable of delivering rated power.
----------------------------------------------------
I made failed attempt at measuring current here.

A Test. How much Voltage (power) do your speakers need?

Yes, hard to say. I'll have to actually measure and look at waveforms and distortion. I was counting it as 140 WPC.

www.diyaudio.com

i am sure this is not right way to measure current. At that time i wanted to see my transformers capability.
regds.

 

[pma]

With the 8ohm load and the units I tested, the current drawn is 5A peak and the SMPS used can supply up to 10A.

 

[amper42]

I commented because you seem to think there is a difference there. Those labs are certified by regulatory entities to have identical compliance to any other lab so situated. It makes no sense then to say you have a preference for one lab location over another.

It might make sense if you have a preference for a working environment based on a free democratic society versus a society where your survival is based on your ability to weigh how a dictator may react to your every action. The ethical standards and working environments in China differ significantly from those in free democratic societies, largely due to the country's unique political and economic structure. This difference can lead to varied outcomes for businesses and workers alike. Workers' actions and decisions are often influenced by considerations of how the government might react, rather than purely professional or ethical concerns. The lack of institutionalized systems for scrutiny and challenge from below makes it difficult to check and correct mistakes.

There can be valid reasons why one might have a preference for one lab location over another.

 

[Julf]

It might make sense if you have a preference for a working environment based on a free democratic society versus a society where your survival is based on your ability to weigh how a dictator may react to your every action. The ethical standards and working environments in China differ significantly from those in free democratic societies, largely due to the country's unique political and economic structure. This difference can lead to varied outcomes for businesses and workers alike.

The working environment in China differs from that in free societies. Workers' actions and decisions are often influenced by considerations of how the government might react, rather than purely professional or ethical concerns. The lack of institutionalized systems for scrutiny and challenge from below makes it difficult to check and correct mistakes.

Indeed. That is why I prefer European products rather than Chinese, Russian or US products.

 

[pma]

Indeed. That is why I prefer European products rather than Chinese, Russian or US

 

[SIY]

I've no idea what your budget is

Not $20k.

If cost is no object then ????????????

Then I'd keep the Trinnov. More than I need, but if money is no object, why not?

I would highly suggest the AVM 90 and call it a day.

Gracias for the recommendation!

 

[AdamG]

Just a friendly reminder that we need to stay away from discussing Politics or Geopolitics. Realize that these topics/conditions play a major role in production and quality. But these subjects devolve into poo throwing parties. Someone has to clean up afterwards and that someone will be the Staff. So let’s not please.

 

[Buckeye Amps]

Just a friendly reminder that we need to stay away from discussing Politics or Geopolitics. Realize that these topics/conditions play a major role in production and quality. But these subjects devolve into poo throwing parties. Someone has to clean up afterwards and that someone will be the Staff. So let’s not please.

The only thing I'll add as a sort of rebuttal to a comment regarding Eastern standards/practices a few posts above:

Money plays just as much, if not more, of a role in industry as the political/societal structure of a producing country where lack of accountability may be called into question. Which is why Western standards/production/safety is no less prone to failures or lack of oversight as money can buy a lot of leeway when it comes to oversight/accountability.

So even as an American, I know better than to start throwing rocks...

 

[Sal1950]

Indeed. That is why I prefer European products rather than Chinese, Russian or US products.

Not a dang thing wrong with exercising a bit of nationalism in our purchasing decisions.
As the old saying goes, Charity begins at home.

 

[Holmz]

Voltage source.

Yeah I know.

However the Hiten fellow seemed to indicate that current needs to be measured directly…