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Old 16th August 2010, 04:42 PM   #221
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If you choose your heatsinks with a bit of forethought, the case will design itself.

None of us, well very few, want a Nelson Pass Amplifier that looks like an afternoons collection of aluminium and loads of nuts and bolts.

My Metal Workshop consists of a couple of wooden blocks and a Hand Drill.

I opted to build the entire amplifier into an aluminium frame, just pices of 10mm aluminium held together by 50x50x5mm aluminium angle. The bottom is 10mm aluminium plate and tyhe top is 3mm aluminium plate. As a box it looks pretty good but I wouldn't want it in prime position in the lounge. Nor would it dissipate enough heat.

Spraying the top and bottom black and surrounding the chassis with 4 C/Watt heatsinks makes a finished product that is not too far off the original.

I am limited to a height of 250mm for my design, so I have opted for 190mm heatsinks to allow adequate airflow.

I reckon the Duo-Block (ie two mono-blocks in one case) will run at about 60 - 70 degrees.
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Old 17th August 2010, 12:28 PM   #222
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My realization:

YouTube - ADCOM GFA555 UPGRADE

Ciao
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Old 17th August 2010, 12:38 PM   #223
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YouTube - ADCOM GFA555 UPGRADE
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Old 18th August 2010, 06:51 PM   #224
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Anyone following the build of my Aleph4. I have now completed the chassis and attached the heatsinks.

I'm trying to get a decent quote for cutting cooling slots in the top and bottom covers, if not it will be out with the Jigsaw and some good British luck, along with good weather.

Click the image to open in full size.
I hope that the image is a reasonable size this time and not 2.1MB.
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Old 18th August 2010, 08:02 PM   #225
lgreen is offline lgreen  United States
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Andy5112405, nice job! Why don't you start an "Aleph 4 build thread" so that we can all follow your progress (rather than using the pics thread, which is mostly finished projects)?

I like the fact that you are applying lots of elbow grease vs. using a fancy machine shop.
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Old 18th August 2010, 10:38 PM   #226
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I'm following Andy. If you ever open a build thread....

Regards,
Regi
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Old 19th August 2010, 04:20 PM   #227
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When the project is complete I will look into posting the entire build as a thread. This one has really been an excercise in luck, hence the extremely low build cost. I hope that Nelson himself will agree that the build quality has not been compromised. I would have preferred larger transformers but 2 x 500VA are adequate.
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Old 19th August 2010, 04:34 PM   #228
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No wasted real estate here. Possibly an improvement on the original, even if it may run slightly hot.

I've mounted the Input and Ouput sockets on the panel that would normally have the eighth heatsink attached.

Click the image to open in full size.
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Old 19th August 2010, 08:47 PM   #229
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Variac View Post
Would be a fun contest to have. Pick a Pass amp or First Watt, and everyone makes the cheapest version they can that's not compromised to be worse than a commercial version of the same. I would predict a lot of pots and pans being used for heat sinks! Surplus and E-bay allowed.. But not stuf you have "Laying around" You would need receipts..

Of course looks could also be judged- Balancing cost and appearance..
well - something tells me that is hard to beat "Papa's Surprise" amp

few Donuts , few chokes for choke input PSU , few cans ......... everything from shelf

that's all I need to finish best looking amp



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Old 22nd August 2010, 12:50 AM   #230
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Default Case building

Ok I thought I would post some pictures of my case building efforts. I have cut up enough aluminium so that I can quickly switch between either two wide cases or two narrow cases (ie two stereo cases or two monoblock cases)
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File Type: jpg 027.JPG (162.2 KB, 2779 views)
File Type: jpg 025.JPG (147.8 KB, 2690 views)

Last edited by Melon Head; 22nd August 2010 at 12:55 AM.
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