Sorry, but I could not find a recent Pass Labs thread associated with heatsinks, so here goes.
I recently purchased a pair of fan-shaped aluminum heatsinks on eBay from a U.S. supplier, for $55 + free shipping. They are massive aluminum. The seller quotes a 0.74 degree C/W spec, but I suspect that may be conservative. They may be a little "light" for an F5 build, but you'all may find them useful in other Class A designs. (I know it's probably heatsink "overkill", but I'll be using these in a Class D chipamp.) The mounting surface for the semi-conductors/components is almost mirror-like (very nice construction).
The seller's ad says he has more. Here's the info, if you'all are interested:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
...and no--the seller isn't my brother or uncle, or cousin...... 🙂
I recently purchased a pair of fan-shaped aluminum heatsinks on eBay from a U.S. supplier, for $55 + free shipping. They are massive aluminum. The seller quotes a 0.74 degree C/W spec, but I suspect that may be conservative. They may be a little "light" for an F5 build, but you'all may find them useful in other Class A designs. (I know it's probably heatsink "overkill", but I'll be using these in a Class D chipamp.) The mounting surface for the semi-conductors/components is almost mirror-like (very nice construction).
The seller's ad says he has more. Here's the info, if you'all are interested:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
...and no--the seller isn't my brother or uncle, or cousin...... 🙂
Attachments
Bottom clearance - no saggy bottoms around here.. A breath of air from a slow fan might make those heat sinks very A-worthy.
And they're HEAVIER than aluminum cylinder heads, for a small-block Chevrolet....!
P.S.--I'd agree..... with some light forced air movement around these, they ought to be very impressive. I'm using some reduced-speed fans on my F5 (with the large Conrad heatsinks), and my biggest challenge is getting the MOSFETs up to temp......
wow. it looks like massive heatsinks. do you have the dimensions?
EDIT: never mind. i found it. 0,74. maybe. it depends onon the temp of the heatsink. you want 25celsius above ambient?
3pr channal will do it 🙂
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More info on these heatsinks
From the eBay seller:
I do have many other lengths (up to 6ft) so if you tell me the aproximate size your looking for I can see what I currently have available. If you'd like an exact length I can accomodete that as well but there is a cutting fee that would have to be covered. It's a fee that I have to pay and I'd just pass that amount along. I have several already cut, exactly like you received except for the length, in the 4", 6", 7" and 11" ranges. I'd be happy to give you a good deal on any of them. I also have many other profiles (shapes) in stock so if there is a preference for shorter or wider or whatever; let me know and I can send you a drawing of the closest match. Regarding the power rating, the 0.74 C/W rating was my personal testing. The industry standard for that part is closer to 0.7 C/W.
-------------- I've asked the eBay seller for his "non-eBay" Email address; when I get it, I'll post it for you'all, in case you want further communication with this seller.
From the eBay seller:
I do have many other lengths (up to 6ft) so if you tell me the aproximate size your looking for I can see what I currently have available. If you'd like an exact length I can accomodete that as well but there is a cutting fee that would have to be covered. It's a fee that I have to pay and I'd just pass that amount along. I have several already cut, exactly like you received except for the length, in the 4", 6", 7" and 11" ranges. I'd be happy to give you a good deal on any of them. I also have many other profiles (shapes) in stock so if there is a preference for shorter or wider or whatever; let me know and I can send you a drawing of the closest match. Regarding the power rating, the 0.74 C/W rating was my personal testing. The industry standard for that part is closer to 0.7 C/W.
-------------- I've asked the eBay seller for his "non-eBay" Email address; when I get it, I'll post it for you'all, in case you want further communication with this seller.
AudioSan, and all......
The dimensions on these specific heatsinks are a 3-3/8" x 5" base, with fins rising 5-3/8" from the milled surface of the base. These are my actual measurements of my samples.
The dimensions on these specific heatsinks are a 3-3/8" x 5" base, with fins rising 5-3/8" from the milled surface of the base. These are my actual measurements of my samples.
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