I've heard that paint offers very little thermal resistance and I don't suspect a powder-coat would be wildly different. It would be nice to see some hard data on the performances of different finishes.
I'm still rounding up parts for a balanced push-pull class A (mono-block) amplifiers of my own design. I presently listen to a home-made Aleph 4's built into mono-blocks and heavily tweaked. The Alephs may very well prove to be a excessively high bench mark by which to compare my own work. If my existing Alephs better my design even after lots of subsequent tweaking, I will simply turn the push-pull into a balanced single-ended design and go from there.
How about you Beedlo, perhaps you are building two stereo Aleph30's for a bi-amped system? Please do tell.
I got a quote back for a 4 inch extrusion of 65340, yes inches
I gave them a call and they sense that something was weird as well, they calculating another quote as we speak.
But here is what it costs for a 4" *smirks* length:
$50.00 setup fee.
$26.26 Black anodize 65340, 4"
I was planning on building two Aleph 30s, one as a gift for my cousin. I was digging through all my junk yesterday and found a Maryland 800VA +/-25 VAC toroid. I honestly don't know where that came from . So now I have plans for building an Aleph 30 and a dual channel Aleph 60 or 5 
As with powder coating, I am tempted to find two identical heatsinks, one anodize, and one powder coated. I know someone who works in the auto industry and may be able to get something small powder coated for cheap.
I gave them a call and they sense that something was weird as well, they calculating another quote as we speak.
But here is what it costs for a 4" *smirks* length:
$50.00 setup fee.
$26.26 Black anodize 65340, 4"
I was planning on building two Aleph 30s, one as a gift for my cousin. I was digging through all my junk yesterday and found a Maryland 800VA +/-25 VAC toroid. I honestly don't know where that came from
. So now I have plans for building an Aleph 30 and a dual channel Aleph 60 or 5 As with powder coating, I am tempted to find two identical heatsinks, one anodize, and one powder coated. I know someone who works in the auto industry and may be able to get something small powder coated for cheap.
Score! I should have junk drawer like that! It would make my day if a few big toriods just sorta showed up in there!
My brother has had a a lot of powder-coating done, I'll have to ask him about cost. A side-by-side camparison like you mention would be nice to try.
It's funny all trouble your having with R-Theta, I had a rather straight forward experience with them. My heatsinks might show up next week or soon after. I can give a report on quality in the near future, given all the things I've heard about R-Theta I expect I'll be pleased
I just got my quote back from R-Theta.
The following is the price for six 8" extrusions of 65340, black anodized.
Part
65340-8.0"B
Qty.
6
Unit Price
50.44
Setup Fee
50
So total minus shipping would be ~ $350.
A piece from conrad is slightly more expensive but shipping is
By the way Gaucho, do you have any pictures of your Alephs?
I am sure the sight of your Alephs would be inspirational.
The following is the price for six 8" extrusions of 65340, black anodized.
Part
65340-8.0"B
Qty.
6
Unit Price
50.44
Setup Fee
50
So total minus shipping would be ~ $350.
A piece from conrad is slightly more expensive but shipping is
By the way Gaucho, do you have any pictures of your Alephs?
I am sure the sight of your Alephs would be inspirational.
There is a pic of one my Aleph channels posted somewhere on this site, not sure where it might be. My work isn't as nice as some:
http://www.passdiy.com/gallery-aleph.htm
http://www.passdiy.com/gallery-aleph.htm
Oh, I see I wasn't very clear in my last post. A pic of my amp is posted here on diyaudio.com not on the passdiy site. I just linked the passdiy.com gallery to provide some proper inspiration.
I recieved my heatsinks today! I'm very pleased with them, they have nice anodizing and the cuts are very clean.
I received order confirmation by e-mail on the 17th, which I believe was the same day I placed the order. The sinks shipped on the 31st just as stated in the confirmation. So it was only 2 weeks and a day.
Yep, the buyer pays for shipping. When I placed my order I asked them to put the shipping charge on their shipping account and then just bill my credit card for the cost.
I looked up the E1365U-F extrusions; they're 27.84 inches wide and 36.31 pounds per foot!
12 18" pieces will weigh over 650 pounds! Can this be right? Your going to need to rent a fork-lift if those arrive at your doorstep!
The sinks are for a little project!?!
Casey, when R-theta gets back to you, please let us know their quote too.
The sinks are for a little project!?!
If I drop you into the middle of this thread, you'll understand...
-Casey Walsh
A cheque is a good idea! I got charged twice on my credit card! No doubt due to my non-standard request:
I paid once for the heatsinks and once for the heatsinks plus shipping!
Not a big deal at all, I 'll just have to let R-Theta know so they can remove the extra charge.
Glad to hear your taking the plunge Beedlo!
Yes I know of your participation in that project, I was being a bit tongue in cheek.
I do have a question or two regarding the Monster: Are you guys liable if you take out the state power grid? Do you have a lawyer on hand who is versed in such matters?
Casey's quoted prices from ThermaFlo seem good to me! 700 USD for 650 pounds of heatsink is cheaper then I would have ever thought possible. I have been told (incorrectly ?) the cost of just the electricity required to refine aluminium is about a buck per pound.
I will be very curious to see Casey's prices from R-Theta.
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