Peachtree Gan 1 beta testing sign-ups open

[georgehifi]

Well it didn't take them long and digital input with dsp , hopefully @amirm may get hold of one to test seeing they are soooooo cheap!!!

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www.taobao.com

taobao | 淘寶

淘寶（Taobao）讓您隨心淘超值商品，爲您提供流行服飾、美妝洗護、3C數碼、大小家電、家俬家居、箱包皮具、運動戶外、五金工具、玩具等千萬件熱銷好貨，淘寶支持文字或圖片搜索商品。天貓淘寶海外作爲Taobao面向華人的跨境電商平台，覆蓋200多個國家和地區的消費者，其中核心站點包括：淘寶香港（taobao hk）、淘寶台灣（taobao tw）、淘寶澳門、淘宝新加坡、淘宝马来西亚、淘宝韩国（타오바오 사이트）、淘宝澳洲、淘宝加拿大、taobao world。

www.taobao.com

Cheers George

 

[georgehifi]

​

A subjective review done last month on the Peachtree "GaN-1" 2nd gen amps other being "Carina GaN"
Now all we need is a review sample for tech performance for Amirm to play with

Peachtree Audio GaN 1 Gallium Nitride Power Amp Reviewed - Future Audiophile Magazine

Peachtree Audio GaN 1 Power Amp is a unique use of Gallium Nitride Class-D amps designed to work on variable output audiophile streamers

futureaudiophile.com

Cheers George

 

[Koeitje]

​

A subjective review done last month on the Peachtree "GaN-1" 2nd gen amps other being "Carina GaN"
Now all we need is a review sample for tech performance for Amirm to play with

Peachtree Audio GaN 1 Gallium Nitride Power Amp Reviewed - Future Audiophile Magazine

Peachtree Audio GaN 1 Power Amp is a unique use of Gallium Nitride Class-D amps designed to work on variable output audiophile streamers

futureaudiophile.com

Cheers George

I learned absolutely nothing from this review. So much text and no useful information.

 

[goryu]

The first part of the review says all you need to know about the reviewer and the review:

"There is zero feedback within the amplifier circuitry of the GaN 1, which preserves fidelity. By design, most traditional amplifiers need to take a tiny bit of the signal after amplifying it and feed it back into the signal path before the amplification section to make the amplifier stable. That’s just how many traditional amps work, but doing so can lower the fidelity of the sound a little bit. Peachtree has gone the more difficult design route to assure feedback is not required. Amp geeks like me are starting to rejoice."

Clearly the reviewer knows nothing about feedback, which actually improves the fidelity when done right (see: Hypex, Purifi, etc.). Further, there is no mention at all in the review of the load dependency of this amp as a result of the open loop topology and the issues that presents regarding fidelity.

Worthless waste of time, but I figured that going in.

 

[georgehifi]

If you ever A/B'd an amp that already has good low distortion and low output impedance without having to resort to masses of global feedback, just some local.
And then listened to the same amp with masses of global instead just to get those figures even a bit better again, then (if you have ears) you know what they're on about.

Just slapping loads of global feedback around amps to get great .000001% figures, is just a bandaid fix. Designing an amp with little or no global feedback in the 1st place to have good figures is a hell of a lot harder to do and in the end better sounding for it.

Cheers George

 

[goryu]

If you ever A/B'd an amp that already has good low distortion and low output impedance without having to resort to masses of global feedback, just some local.
And then listened to the same amp with masses of global instead just to get those figures even a bit better again, then (if you have ears) you know what they're on about.

Cheers George

If you knew more about feedback and open loop vs closed loop in class d amps a la Hypex and Purifi, perhaps you wouldn't be stuck in that 1970's mentality that there is something wrong with feedback done properly and you might know what Putzeys is on about.

 

[Killingbeans]

If you ever A/B'd an amp that already has good low distortion and low output impedance without having to resort to masses of global feedback, just some local.
And then listened to the same amp with masses of global instead just to get those figures even a bit better again, then (if you have ears) you know what they're on about.

Cheers George

Do it again blind, and you'll be back to random guessing.

 

[georgehifi]

Speakers have whole percents points of distortions!! it doesn't matter if the amp is .001% or .00001%, but it does sound very different when a little local vs a lot of global feedback is used around a well designed same amp, so long as damping factor (output impedance) is still kept reasonable, the local feedback will and does sound better, "less sterile".

Cheers George

 

[goryu]

What might sound different is using an amp with load dependent frequency response.

You seem to have yet grasped the reality that there is no "sounds better", only "sounds different". I think you are in the wrong venue.

Seems like your a fan of distortion. To each his own.

 

[Killingbeans]

but it does sound very different when a little local vs a lot of global feedback is used around a well designed same amp, so long as damping factor (output impedance) is still kept reasonable, the local feedback will and does sound better, "less sterile".

Any proof of of that, other than anecdotes?

 

[georgehifi]

Seems like your a fan of distortion.

No, not when it's that low and then in the end coming through speakers that are "hundreds of percents higher" before reaching your ear.
But the difference in sound between little or no feedback on a well designed amp that still has good measurements vs the same one with masses of feedback is quite startling to your listening pleasure, should try it one day.

Cheers George

 

[Killingbeans]

Just slapping loads of global feedback around amps to get great .000001% figures, is just a bandaid fix. Designing an amp with little or no global feedback in the 1st place to have good figures is a hell of a lot harder to do and in the end better sounding for it.

Right... I guess it was a walk in the park for Bruno Putzeys to get those post filter control loops working as well as they do

https://linearaudio.net/sites/linearaudio.net/files/volume1bp.pdf

 

[georgehifi]

"There is no such thing as too much feedback" no not to an analyzer, but to an ear there is.

Whatever, wait till mosfet Hypex/Puifi mosfet supply stock run out, and then see where they look to for their next gen output devices, together with a total circuit redesign.

Cheers George

 

[Killingbeans]

That makes no sense, IMO.

The Hypex/Purifi modules use off-the-shelf parts that are widely available. Just because GaN FETs are taking over in the high speed power switching segment of the electronics industry, doesn't mean that old-school MOSFETs will disappear completely. They will remain as a cheaper alternative for slow(er) speed switching for a very long time to come.

GaN gives largely pointless performance gains at the sweet-spot switching speed of a class D amplifier. Helps a bit with lowering the thermal losses, though.

A better use of GaN would be to focus on the PSUs. A bridgeless totem-pole PFC design switching at several MHz. That would do a lot more in the hunt for better power density.

The real next-gen is what we are seeing with the chips from Axign. Global feedback with an ADC in the middel. The horror!

I can imagine the mountains of "sterility" the typical audiophile hears from those when the expectation bias kicks in

 

[goryu]

"There is no such thing as too much feedback" no not to an analyzer, but to an ear there is.

Whatever, wait till mosfet Hypex/Puifi mosfet supply stock run out, and then see where they look to for their next gen output devices, together with a total circuit redesign.

Cheers George

lol, get a clue. This is getting old and tiresome.

Hypex has their product produced in SE Asia as I recall. Lars Risbo already shut down your nutty theory on the DIY audio site. Guess you decided to drag that stinking bag of doggie doodoo over here. Good luck with that.

 

[georgehifi]

lol, get a clue. This is getting old and tiresome.

Then stay away if it worries you so much and don't believe in semiconductor progress.

 

[goryu]

Then stay away if it worries you so much and don't believe in semiconductor progress.

I'm not worried in the least. What I don't believe in is willful ignorance. You continue to spread your subjective bs here and everywhere without the slightest factual evidence to support your vapid claims. If I didn't know better I would say you must own stock in a GaN related company. Oh, wait, you have already said you do. Guess we know what is motivating you.

 

[georgehifi]

Deleted, sorry not biting, you have an agenda that I'm not going to pander to.

As I said it's all subjective.
Bruno Putzey: "There is no such thing as too much feedback"
No not to an analyzer there's not. But to an ear there is if the amp still measures well with just a little local feedback and has good specs still.

 

[Killingbeans]

No not to an analyzer there's not. But to an ear there is if the amp still measures well with just a little local feedback and has good specs still.

Then be absolutely sure to test only the ear with nothing else in the mix. Double blind and proper controls.

And that's not an "agenda". It simply removes hearsay and bias from the subjective data and turns it into usefull information.

I honestly can't fathom why you are so content relying on unsupported assertion.

 

[JustJones]

Where's the measurements on this amp, not interested in anyone's sighted listening impressions.