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DIY Purifi Amp builds

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JimB

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Sooo..... Anyone done any DIY with Purifi modules, lately? :)

I heard from Ghent that they are making slow progress due to the impact of COVID on efficiency, but also because they are creating a new case form for these amps (250mm wide, instead of 200 or 300). A new extrusion die is needed and they are still optimizing it (as I understand). It will likely be about 2 more months before we see any completed cases.
 
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Sooo..... Anyone done any DIY with Purifi modules,lately? :)
Getting started, but more in an "assemble it yourself" context.

I just received an EVAL1 kit yesterday for a DIY stereo amp build. I still haven't finished my TPA3251 build but I won't be able to start the Purifi build anyway until the Hypex power supply ships. They're currently backordered.

Eventually I want to swap out the banana connectors for speakON but I'm dragging my heels to see what case Ghent releases later this summer. Until then I'll probably throw it into a temporary box.

I'd like to add a music sense power trigger. I plan to use it with a DAC like the M300 mk2 which I don't think has a 12V trigger out on it.
 

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Sooo..... Anyone done any DIY with Purifi modules,lately? :)

I heard from Ghent that they are making slow progress due to the impact of COVID on efficiency, but also because they are creating a new case form for these amps (250mm wide, instead of 200 or 300). A new extrusion die is needed and they are still optimizing it (as I understand). It will likely be about 2 more months before we see any completed cases.
My 2 Purifi modules should arrive tomorrow, and my Neurochrome buffers maybe next week. Though it might take a few more weeks for my power supply to arrive, apparently the SMPS1200A400 is out of stock everywhere.

Haven't ordered my case yet, but will probably do that next week. Will get one of those Hifi2000 cases with custom cutouts in the back for a 3 channel setup in mind, though I'm starting off with only 2 channels.
 
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Getting started, but more in an "assemble it yourself" context. ... Eventually I want to swap out the banana connectors for speakON but I'm dragging my heels to see what case Ghent releases later this summer. Until then I'll probably throw it into a temporary box. ...
I (and likely others) have asked that Ghent consider offering a case kit for these with SpeakONs, like they do for the Hypex. We'll see...
 

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Sooo..... Anyone done any DIY with Purifi modules,lately? :)

I heard from Ghent that they are making slow progress due to the impact of COVID on efficiency, but also because they are creating a new case form for these amps (250mm wide, instead of 200 or 300). A new extrusion die is needed and they are still optimizing it (as I understand). It will likely be about 2 more months before we see any completed cases.
I do have some exciting news about cases for Purifi DIY build.

I have asked for the CAD drawing of the Modu shop GX288 case and sent it to Purifi. They are helping me adapt the necessary holes of the EVAL1 into the CAD drawing. When I get it I will send it back to Modu shop. After that, anyone can order a GX288 case from Modu shop and ask for it and it will be EVAL1 ready!
https://modushop.biz/site/index.php?route=product/product&path=25_291_293&product_id=444

Attached is the original CAD file that the Purifi team used for their demo unit, which is of very similar size to GX288 (photo by @Doug Schneider 's SoundStage! Network, they are going to release their Purifi review was released on June 1st).

Notice that the demo unit also has speakon holes on the chassis. Purifi said they would send both files, with and without speakon holes, so that the Modu shop customer can choose.

Stay tuned. :)

Purifi EVAL1.jpg
 

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boXem | audio

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I do have some exciting news about cases for Purifi DIY build.

I have asked the CAD drawing of the Modu shop GX288 case and sent to Purifi. They are helping me adapt the necessary holes of the EVAL1 into the CAD drawing. When I get it I will send it back to Modu shop. After that, anyone can order a GX288 case from Modu shop and ask for it and it will be EVAL1 ready!
https://modushop.biz/site/index.php?route=product/product&path=25_291_293&product_id=444

Attached is the original CAD file that the Purifi team used on their demo unit, which is of very similar size to GX288 (photo by @Doug Schneider 's SoundStage! Network, they are going to release the Purifi review June 1st).

Notice that the demo unit has also speakon holes on the chassis. Purifi said they would send both files, with and without speakon holes, so the customer can ask Modu shop with or without the holes.

Stay tuned. :)

View attachment 65911
That's a really neat build.
Did they tell you who was supplying their case?
 

Matias

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That's a really neat build.
Did they tell you who was supplying their case?
I did not ask, but honestly, the Modu shop GX288 looks very similar and costs 50 euros based in Italy. It is already an excellent option.
 

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Sooo..... Anyone done any DIY with Purifi modules,lately? :)

I heard from Ghent that they are making slow progress due to the impact of COVID on efficiency, but also because they are creating a new case form for these amps (250mm wide, instead of 200 or 300). A new extrusion die is needed and they are still optimizing it (as I understand). It will likely be about 2 more months before we see any completed cases.
This is too on topic lol
 
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... Attached is the original CAD file that the Purifi team used on their demo unit, which is of very similar size to GX288 (photo by @Doug Schneider 's SoundStage! Network, ... Notice that the demo unit has also speakon holes on the chassis. Purifi said they would send both files, with and without speakon holes, so the customer can ask Modu shop with or without the holes. :)
WHAT? No hole for S1???

But I do see that they used both fixing holes for each XLR socket.
 

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Any word about a purifi power supply yet?
That is the one thing that stops me from selling my nc400: without a dedicated low idle power supply there is very little to gain in going for a low idle 1ET400A.
 

boXem | audio

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I did not ask, but honestly, the Modu shop GX288 looks very similar and costs 50 euros based in Italy. It is already an excellent option.
I know it quite well. Not a huge fan of the form factor. But even after machining, will be far cheaper than a Ghent case.
 
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WHAT? No hole for S1???

But I do see that they used both fixing holes for each XLR socket.
I'd be happy even with no hole for S1. At least it's one hole I need to punch instead of several. Plus I think the intended use will be for a front switch and S1 removed.
 

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Any word about a purifi power supply yet?
That is the one thing that stops me from selling my nc400: without a dedicated low idle power supply there is very little to gain in going for a low idle 1ET400A.
The OUTPUT STAGE idle losses for two 1ET400As are ~3.4W (rest of circuitry unspecified! 3W each?). An FE02A board, about 2-3W? Total maybe ~12W? The SMPS1200A400 idle spec is ~9W (230V, 50Hz). What would make you happy, 5W? 3?
 

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The OUTPUT STAGE idle losses for two 1ET400As are ~3.4W (rest of circuitry unspecified! 3W each?). An FE02A board, about 2-3W? Total maybe ~12W? The SMPS1200A400 idle spec is ~9W (230V, 50Hz). What would make you happy, 5W? 3?
I hope the buffer can be made less than that.
A single nc400 with proper VDR is supposed to be 4.5W, with integrated discrete buffer, and the 1ET400A is supposed to be the result of specific efforts to reduce idle.
Regarding power supply, I want to do a mono build, preferably class 2, so some sort of SMPS600 with a lower idle.
Something like 3W would be good I guess, no idea if this can be done...
 

boXem | audio

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I hope the buffer can be made less than that.
A single nc400 with proper VDR is supposed to be 4.5W, with integrated discrete buffer, and the 1ET400A is supposed to be the result of specific efforts to reduce idle.
Regarding power supply, I want to do a mono build, preferably class 2, so some sort of SMPS600 with a lower idle.
Something like 3W would be good I guess, no idea if this can be done...
Such an improvement would really be spectacular.
SMPS600 has 8 W idle losses, SMPS1200 9 W.
Using a single SMPS1200 would allow 4,5 W idle losses per channel, but it's no more dual mono.
 
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If there are concerns about idle power loss, wouldn't it be easier to wire in a relay between line and power supply that is controlled by remote trigger or music sense? Then your idle power loss is limited to relay + sense circuit. Novice AIYer here, asking because I don't know any better.
 

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