Buckeye Amps: 2nd Generation Purifi EIGENTAKT 1ET9040BA Amplifier

[Buckeye Amps]

Thank you! Obvious question: what is the standby with the Hypex power supply (the as shipping model).

Same as idle for the Hypex

 

[Salt]

Correction needed ​

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Buckeye Amps: 2nd Generation Purifi EIGANTAKT 1ET9040BA Amplifier​

As native speaker my autocorrection overwritten that

 

[Buckeye Amps]

Dylan,
Can you easily tell whether the Purifi 1ET9040BA or the 1ET400A is playing in an AB test at normal listening levels?

I can't. Just like the NCx500 and 1ET400A sound identical (to me) at normal listening levels.

The game now is SOTA via measurements. Thresholds of hearing have been exceeded, imo.

But others in the business are probably going to make very different claims with their offerings.

 

[pogo]

I can't.

That's interesting and I wouldn't have expected it.
I have heard differences with two bridged 1ET400A regardless of the volume. The 1ET9040BA is also bridged. But perhaps this is also due to the different implementations of the bridging. The implementations from NAD and Lyngdorf also have twice the output power at 8 ohms as a 1ET9040BA.

 

[yys310]

But perhaps this is also due to the different implementations of the bridging. The implementations from NAD and Lyngdorf also have twice the output power at 8 ohms as a 1ET9040BA.

The supply voltage range for 1ET9040BA is +-48V. With BTL you got +-96V of voltage swing across the driver.
While with 1ET400A you can have +-70V SE and with 1ET400A BTL you got +-140V output on driver so the output power at 8ohm is higher compare with 1ET9040BA.

 

[Buckeye Amps]

That's interesting and I wouldn't have expected it.
I have heard differences with two bridged 1ET400A regardless of the volume. The 1ET9040BA is also bridged. But perhaps this is also due to the different implementations of the bridging. The implementations from NAD and Lyngdorf also have twice the output power at 8 ohms as a 1ET9040BA.

YMMV.

A lot of variables come into play within someone's setup that could determine if and why they hear a difference between two amps that both have excellent performance metrics.

This is why customers are usually surprised at my recommendations based off their setups and normal usage when they ask me for advice between all the different amps.

 

[Deleted member 8362]

I can't. Just like the NCx500 and 1ET400A sound identical (to me) at normal listening levels.

The game now is SOTA via measurements. Thresholds of hearing have been exceeded, imo.

But others in the business are probably going to make very different claims with their offerings.

Thank you for your humble opinion. I'm in love with my EVAL1 and I hope I can try a better measuring one like EVAL4s, the worst scenario will be they sound the same to me.

 

[Buckeye Amps]

Attached are the AP measurements using the Micro Audio SMPS. We are still working with AP to track down the small noise in our test system (since the Loopback measurement is not all the way where it should be) but this is more an exercise in perfection mixed with some futility. As some may know, at such low levels of noise/high resolution in measurements, the most inconsequential variable can affect the baseline.

For the small upticks on the power curves, this is the behavior of the AP switching to different voltage scales (so not a fault or defect with the amplifier).

Will have follow-up measurements using the Hypex SMPS1200A180 later this week.

 

[goryu]

Thanks!

Any idea why all the plots with the buffer engaged show a bump in distortion at 60Hz? Related somehow to the power wiring or?

 

[Buckeye Amps]

Thanks!

Any idea why all the plots with the buffer engaged show a bump in distortion at 60Hz? Related somehow to the power wiring or?

Just a slight grounding issue due to the case not being 100% ready for the test build (not an issue for production/consumer builds).

 

[goryu]

One other quick question- it looks like the smps was tested up to roughly 500W- I thought it was rated at 1200 or 1400W?

 

[yys310]

One other quick question- it looks like the smps was tested up to roughly 500W- I thought it was rated at 1200 or 1400W?

Because they're audio SMPS.
Crest factor is in there for marking the audio related power rating.
Same behavior shown in SMPS1200.

 

[Matias]

Correction needed ​

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Buckeye Amps: 2nd Generation Purifi EIGANTAKT 1ET9040BA Amplifier​

Nope, it's Eigentakt indeed.

https://purifi-audio.com/eigentakt

 

[pogo]

The correction has already been made.
That was the previous heading.

 

[Buckeye Amps]

One other quick question- it looks like the smps was tested up to roughly 500W- I thought it was rated at 1200 or 1400W?

It was tested up to almost 800w into 4ohm (need to zoom in near the top of the curve to see the lines for 600/700/800w)

We have not done 2ohm testing yet (need more resistors). Sami at MA has done his own testing on the SMPS (a lot of torture testing) and it indeed can handle 1200-1300w without issues.

 

[goryu]

Because they're audio SMPS.
Crest factor is in there for marking the audio related power rating.
Same behavior shown in SMPS1200.
View attachment 382590

Thanks, that's what I figured but wanted to confirm.

 

[pogo]

When I look at the psu and the thermal management of NAD for two 1ET400A, I wonder what would be possible with the new 1ET9040BA, 2kW or more?
M23/M33 manage around 800W into 2 ohms.

 

[RickS]

It was tested up to almost 800w into 4ohm (need to zoom in near the top of the curve to see the lines for 600/700/800w)

We have not done 2ohm testing yet (need more resistors). Sami at MA has done his own testing on the SMPS (a lot of torture testing) and it indeed can handle 1200-1300w without issues.

Just to add as there appears to be confusion over the terse graph title…

The amplifier was tested with a 4 ohm resistive load and it meets the 750 watt Purifi spec at 0.1% distortion. With a 2 ohm resistive load, the expected output is about 1400 watts. Using the MicroAudio SMPS, the amp should meet the Purifi 2 ohm spec. Using the Hypex A180 SMPs, it will be somewhat less as the power supply maxes out at 1200 watts.

P.S.

Was mentioned earlier, but chasing 1400 vs 1300 watts is comparable specsmanship to chasing SINAD way past audibility. I will be happily using my 9040 with the Hypex A100 SMPS that was bought as a test unit. Would be a shame to let it sit unused over small difference in power.

 

[shion_ca]

Do the measurements look similar for the hyper power supply performance wise aside from top power output at 2 ohm? Were you going to post them?

 

[Buckeye Amps]

Do the measurements look similar for the hyper power supply performance wise aside from top power output at 2 ohm? Were you going to post them?

Will be posting them next week. Been a little busy.

But yes, same THD and SNR.