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Old 6th February 2009, 02:31 AM   #1
Coulomb is offline Coulomb  England
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Default Aavid Thermalloy Possible Group Buy

I have been making some inquiries about getting some Aavid Thermalloy Profiles for a Group Buy.

In order to make a GB feasible we would need to hit 100 units.

I am considering three profiles and have included the links below. I would have to focus on only 1 of the 3 and only one size to maximize the number of pieces ordered.

They would be Finished and Black Anodized, I am targeting either a 6" or 8" length for these cross sections. The °C/W is .30 per heatsink on these combinations.

I have a quote already on 72545 at 8" Min order 100 units @ $64 USD plus applicable taxes and shipping. FOB Chicago. I may be able to improve the price.

I do not know if there is enough demand at this time for another large Group Buy, we will have to wait and see. I believe the 72545 will be the least expensive option.

72545 x 8"

63340 x 8"

62335 x 6"
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Old 6th February 2009, 02:55 AM   #2
pooge is offline pooge  United States
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Looks OK; but expensive, and base plate a little on the thin side.
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Old 6th February 2009, 04:17 AM   #3
Coulomb is offline Coulomb  England
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Quote:
Originally posted by pooge
Looks OK; but expensive, and base plate a little on the thin side.
I think the Conrad heatsinks were a lot smaller and had a "corrected" rating of .30 where these have an actual .30 rating. They were $40 and the R-Theta ones I did the group buy on were about $50 for an 8" section.

I agree the Aavid are a bit more expensive but you are getting an almost 15" wide heatsink with 2 3/4" fins and 8" in length. This is a massive heatsink!

Anthony
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Old 6th February 2009, 05:18 AM   #4
pchw is online now pchw  United States
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First, out of the 3, I prefer 72545 as well.

I have the Conrad with me. For comparison sake:

Width: Conrad is approx 13.75" (Edge: Aavid, 1")
Base: Conrad is close 3/8" which is 1/8" thicker. (Edge: Conrad, 1/8")
Fin: Conrad is 1.5" which a" shorter. (Edge: Aavid, 1")
Length: Conrad's fin side is almost 6" where the base side is 5.75" (Edge: Avid, 2")
#Fins: Conrad has 35 and Avid has 24. (Edge: Conrad 10 fins)

Based on the above, both should be very close in performance. My Conrad was $55 shipped and tapped but didn't get them until 5 months after I paid and almost a year from the GB was initiated. So, I think it probably broils down to the price and how badly the sink is needed.
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Old 6th February 2009, 06:47 AM   #5
Coulomb is offline Coulomb  England
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Aye there's the rub, is there enough demand for another Group Buy of a honking big heatsink at this tme.

I am looking at buying an 8 Foot bar of this stock for myself, I already purchased a 4 foot bar a few years ago and made a nice enclosure with it.

I cut the bar to 8" lengths and placed two side by side to make a Heatsink 13.92" x 8" with 39 Fins, 36 of which are 2.8" long and on a base over half an inch thick. The weight of the Heatsink is 15 pounds. One 8" section runs cold with a BrianGT Mini A strapped to it.

Such an endeavour takes a lot of machine work though and is not a simple Tap and strap together job for you average metal basher.

65605 x 8"

Regards

Anthony
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Old 6th February 2009, 07:05 AM   #6
Coulomb is offline Coulomb  England
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Other Photo's of the Bhassis I built with the 65605 Heatsinks

Aelph Amp

Anthony
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Old 6th February 2009, 08:36 AM   #7
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Just for comparison purposes, this KL-271 extrusion is considered one of the best with about 0.15 C/W from natural convection. It is recommended for the Leach Amp, and you may find more info at that site. There have been a couple group buys for the black anodized ~$65 shipped USA in 2006

http://www.diyaudio.com/forums/showthread/t-56086.html
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Old 6th February 2009, 08:38 AM   #8
pchw is online now pchw  United States
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This is one hack of craftsmanship. I will need to learn and to practice a lot to build anything that is remotely like yours. Needless to say, must invest some serious money on tools as well.
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Old 6th February 2009, 01:59 PM   #9
sts9fan is offline sts9fan  United States
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these look nice but $$$
You can get 2 of the largest Conrad sinks shipped from Australia for $130USD.
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Old 6th February 2009, 04:41 PM   #10
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How about R-Theta again? (just asking) At least they will work with each buyer individually for shipping
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