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Thread: 700B/ Series II heat sinks

  1. #1
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    Screw it

    700B/ Series II heat sinks

    Well, as you guys know, I have been looking for a set of heat sinks for an amp and THEY ARE IMPOSSIBLE to locate. So, Necessity being the mother of invention, I decided to make my own. They need a little tweaking but looks like the idea WILL WORK. It is a butt-load of labor but I believe (Thermal testing will tell ) they will wick heat away just like the originals without the costs Lee incurred while doing a set in copper, which by the way look way awesome comparing them to these economical aluminum ones. I'd love to do a set in copper, but the cost to do 4 sinks for one amp ran at $400 just for the copper parts. Hey, maybe I'll strip the SAE and use those!!! (NOT).

    I still have the option to laser scan and have them CNC'd like the handles but the cash is not there....

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    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
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  2. #2
    Forum Veteran grapplesaw's Avatar
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    Nice Perry. Maybe some thermal grease between the plates before tightening. The original extrusion or something simalar must be available through the window industry. I have a friend in it and will ask where to look for this. The problem is they want to run a lot of material for single order.
    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

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  3. #3
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    Amen Perry, they are a but load of work
    I did 4 sets in copper in total. Are you going to anodize them when you're done? How thick is the plate?
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

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  4. #4
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    Quote Originally Posted by grapplesaw View Post
    Nice Perry. Maybe some thermal grease between the plates before tightening. The original extrusion or something simalar must be available through the window industry. I have a friend in it and will ask where to look for this. The problem is they want to run a lot of material for single order.
    Look close,
    Thermal grease is in the crack.....
    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
    Kenner Close N Play

  5. #5
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    Quote Originally Posted by laatsch55 View Post
    Amen Perry, they are a but load of work
    I did 4 sets in copper in total. Are you going to anodize them when you're done? How thick is the plate?
    The plate is 1/8"
    Anodizing is expensive, im going to see how it conducts heat as is, i have a laser thermometer and will do some experimenting with it down the road.
    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
    Kenner Close N Play

  6. #6
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    Halfbiass...Electron Herder and Backass Woof
    Emisstivity increases greatly with black anodizing. Almost necessary with aluminum. The only reason I got away without anodizing the copper one a, is because they were copper. It will be interesting to see how the bare aluminum does.
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

  7. #7
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    Screw it
    Interesting, maybe ill check with the anodizer again, it's been a while.
    I had the nations problems figured out one night while on blah blah blah........ huh?

    Big amps
    Kenner Close N Play

  8. #8
    Forum Veteran grapplesaw's Avatar
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    Quote Originally Posted by laatsch55 View Post
    Emisstivity increases greatly with black anodizing. Almost necessary with aluminum. The only reason I got away without anodizing the copper one a, is because they were copper. It will be interesting to see how the bare aluminum does.
    Try this on.
    Because of a relationship between absorptivity and emissivity described by Kirchoff's Law of thermal radiation. In short: The reason why black is more emissive is because it absorbs more radiation in thermal equilibrium and thus must also radiate more to maintain that equilibrium.

    Why heatsinks aren't black is because plain aluminium is still quite emissive in infra-red (where it matters) and because black paint may have lower thermal conductivity than bare metal, reducing the primary method of cooling, convection, as plain radiation is a far less important method of cooling.


    there's two things to consider:

    1. Emissivity is always relevant for radiative heat transfer. Emissivity describes how a certain material interacts with EM radiation across all wavelengths, not just in the visible region. Think of it as a graph of emissivity vs. wavelength. If you have an object that isn't hot enough to glow visibly, you are still interested in the emissivity graph at wavelengths greater than 700 nm. Since emissivity refers to the whole graph, it's a little weird to say that emissivity doesn't matter when the object isn't visibly glowing (i.e. < 700 K). However, you can say that emissivity in the visible region isn't relevant.
    2. Radiative heat transfer is not always relevant. For this specific application, convective heat transfer is much more important, so radiative heat transfer (and therefore emissivity) isn't really relevant. However, radiative heat transfer is strongly dependent on temperature (~T4 vs. ~T for convection). So if an object is hot enough to glow visibly, it's likely that thermal radiation is a significant contributor to the overall heat transfer.

    To try and summarize: Does emissivity only become relevant if the object is so hot it's giving off visible light?

    • No, because emissivity covers all wavelengths, not just visible. So an object's IR-range thermal radiation depends on its emissivity in the IR range.
    • Yes, because radiative heat transfer isn't a significant contributor to overall heat transfer at lower temperature
    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  9. #9
    Forum Veteran grapplesaw's Avatar
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    anodising is far and away the best coating for aluminium.
    try the Lightening Bolt WOPL 1000 for a hair lifting experience today

    Warning !!! Use only when you want to blown the town down

    proud father of the only WOPL Fully Comp dual 500

  10. #10
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    Nice work Perry

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