Lucia Amp

menke

Member
I would like to share my build of a Neurochrome / Purifi Amp. The device is named after my mother and dedicated to her. About the housing I choose a different approach which you will see in the following images. I hope you like it. Maybe you can give me some hints for improvement...

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Amp module mounted on 150x70mm heatsink with CNC routed adaptor plate between.

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CNC routed power supply board.

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I modified the input buffer in order to have the input signal pluggable instead of screw terminals.

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Test setup.

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Side view of exoskeleton frame.

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All electronics mounted in the frame. Front and Backpanel only temporary until I get my CNC routed panels. Size: H: 156mm W: 256mm D: 400mm. The housing panels are ordered and need to be processed in order to mount the to the frame.

With this size, the device is compact enough to fit inside a IKEA Kallax. So it is Kallax-Fi as Podcaster John Darko would name it.
I listen to a Eversolo DMP-A6 as a source and a pair of DIY Fullrange TQWT Speakers with Tang Band W6-1916 drivers, designed by Wolfgang Vollstädt of Spectrum Audio (Bremen, Germany).

By listening to the amp, I can only say, it sounds amazing!!!

Any ideas, questions or suggestions about the build?

Jürgen
 
Very tidy! With those heatsinks inside, will you have some type of vents in the top and bottom panels, for convection to take the heat away?
 
You are right, I like it tidy. Also my aim was make it as compact as I can do. What I noticed is, that CNC routed AL Boards help you to mount the PCB's with a high precision. And this leads to a reasonable wiring. Also I would like to change the exterior of the Amp in order to match my speakers. So if I build new ones, I can easily change the skin of the Amp too. This would not be possible without the "Frame".
For natural convection of the heatsinks I am thinking about either a hole pattern or routed slots in the top an bottom panel. I also think there is a slight chance that I could keep the housing completely closed, because of its high efficiency. The heatsinks have small tapped holes in which I put a thermal probe during test, and no matter what volume I have heard, It never ran more than 2 Kelvin above ambient temperature. So at first the panels will be completely closed. Thank you for your comment!
 
Ah, that makes more sense. If the difference in temp is that low, just having the heatsinks attached is probably sufficient. No desperate need to get the heat out of the case.
 
That's very cool. For my Purifi builds I use a laser cut piece of aluminum sheet to hold the buffer and amp module. Very similar to yours. That works very well.

I like the compact build and KallaxFi form factor.

Tom
 
Ah, that makes more sense. If the difference in temp is that low, just having the heatsinks attached is probably sufficient. No desperate need to get the heat out of the case.
Yes Mike, at least that is the plan. We'll see (measure) if the temperature will remain low. If not, I will let a natural airflow go through.
 
If somebody wants to have the STEP file for the CNC routing of heatsink adaptors, here you are. Some countersinks are required, not included in the files. Professionals will figure it out. Also no screw threads included, because I like to tap myself by hand. Sorry for North America but all measurements are metric. The Power Supply Base Plate's STEP file is included as well. If there are questions, let me know...
 

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