Re: Re: Re: Conrad heatsinks
yes, this is what I was referring to a few posts back. 🙂
dw8083 said:
yes, this is what I was referring to a few posts back. 🙂
From my experience, much larger surface area is needed on the lip of the Heatsink for a bottom panel, due to the weight of the tranny and torsional flex of the chassis.
If a flat bottom panel is used, it needs to be 4mm thick. This is OK with me.
Another alternative is a bottom panel 2mm thick and bent up 3/8" to .5" inches to mount the heatsink. Bending provides a great deal of extra strength.
Attached is a picture of a version of this I've used a couple of times with great success. This particular design is a complete "U" channel made from 2mm aluminum. The box is ROCK solid and easily carries the full weight of a class-A amp.
The box was designed and made via Frontpanel Express and bent up at a local sheetmetal shop.
-David
If a flat bottom panel is used, it needs to be 4mm thick. This is OK with me.
Another alternative is a bottom panel 2mm thick and bent up 3/8" to .5" inches to mount the heatsink. Bending provides a great deal of extra strength.
Attached is a picture of a version of this I've used a couple of times with great success. This particular design is a complete "U" channel made from 2mm aluminum. The box is ROCK solid and easily carries the full weight of a class-A amp.
The box was designed and made via Frontpanel Express and bent up at a local sheetmetal shop.
-David
Attachments
Chris,
Can I suggest an alternate supplier to Conrad?
www.accelthermal.com
They have an extrusion that looks to be a good one for high power audio amplifers in their Model #926 profile. They are located in Brea, California. I have no idea as to cost. However I have exchanged friendly emails with the president of the company and I am sure that he would be eager to sell a volume of extrusions. They also do custom milling and anodizing.
Might be worth looking into.
Best Regards,
Carl Huff
Can I suggest an alternate supplier to Conrad?
www.accelthermal.com
They have an extrusion that looks to be a good one for high power audio amplifers in their Model #926 profile. They are located in Brea, California. I have no idea as to cost. However I have exchanged friendly emails with the president of the company and I am sure that he would be eager to sell a volume of extrusions. They also do custom milling and anodizing.
Might be worth looking into.
An externally hosted image should be here but it was not working when we last tested it.
Best Regards,
Carl Huff
Re: Re: Re: Conrad heatsinks
+1 on that. Most of us are not metal fabricators. Paying a few bucks to have it done at Conrad would be cheap compared to the time and frustration I will expend trying to do it myself. 😀
Bill
dw8083 said:
+1 on that. Most of us are not metal fabricators. Paying a few bucks to have it done at Conrad would be cheap compared to the time and frustration I will expend trying to do it myself. 😀
Bill
Re: Re: Re: Re: Conrad heatsinks
If we can do that, sure, I do not mind to play little extra. Please let me know what will be the final deal.
If we can do that, sure, I do not mind to play little extra. Please let me know what will be the final deal.
MashBill said:
I'm a personal friend of Julian, the guy who owns and runs Conrad. He will bend over backwards to help in any way he can, and produces an exceptional product. I've used nothing else on my kit and retail amplifiers for ten years.
Highly recommended.
Cheers,
Hugh
Highly recommended.
Cheers,
Hugh
Re: Re: Re: Conrad heatsinks
Conrad is going to get back to me with a quote on Monday or Tuesday. The production department will be back then to give us a price.
I have emailed this company, and they look like a very good alternative, and one that will probably take the order from Conrad if I can work out an order. A 13.5" by 6" heat sink with 2" fins (the same as the 926 profile just wider) will be about $20 each. Plus, shipping is made much easier and cheaper. I have emailed them for pricing on making a lip, but bear in mind these are raw aluminum. I actually prefer this because it allows me to just paint them black, which supposedly has the lowest thermal resistance (compared to raw aluminum or anodized aluminum). I know Conrad makes a great product, but I don't look forward to having to pick up a 550 pound package from the airport and work out custom fees and all the other fees that are associated with Atlas freight service. I would love to hear some feedback/comments on switching from Conrad to Accel Thermal, I can't really see a reason why not to....
MashBill 4X US
Blues 4X US
jackh 4X US
pchw 8X US
SCD 4X Canada
neb001 8X US
hc167 2X US
luvdunhill 12X US
liasom 2X US
Algar_emi 4X Canada
ipolyakov 4X US
Guiness 4x US
cwujek 4x US
seventenths 2X US
mithomas 4x US
Westley 4X, may go 8X US
Cantskienuf, 4X, US
tubesguy 2X, US
claiborne 2X US, may go up to 4X
groov 4x, -may go up to 8 if new price break is reached- US
niner 4X, US, may go up to 8X
JimT 4X, Canada
JimS 2X, US
pollypocket 4x, Canada
stolbovoy 4x, US
BobEllis 4X, US
Cambe 4X, US
genome 2X, US
sts9fan 2X, US
rdk845 2X, US
John Broskie 2X, US
dw8083 said:
Conrad is going to get back to me with a quote on Monday or Tuesday. The production department will be back then to give us a price.
Carl_Huff said:
I have emailed this company, and they look like a very good alternative, and one that will probably take the order from Conrad if I can work out an order. A 13.5" by 6" heat sink with 2" fins (the same as the 926 profile just wider) will be about $20 each. Plus, shipping is made much easier and cheaper. I have emailed them for pricing on making a lip, but bear in mind these are raw aluminum. I actually prefer this because it allows me to just paint them black, which supposedly has the lowest thermal resistance (compared to raw aluminum or anodized aluminum). I know Conrad makes a great product, but I don't look forward to having to pick up a 550 pound package from the airport and work out custom fees and all the other fees that are associated with Atlas freight service. I would love to hear some feedback/comments on switching from Conrad to Accel Thermal, I can't really see a reason why not to....
rdk845 said:
MashBill 4X US
Blues 4X US
jackh 4X US
pchw 8X US
SCD 4X Canada
neb001 8X US
hc167 2X US
luvdunhill 12X US
liasom 2X US
Algar_emi 4X Canada
ipolyakov 4X US
Guiness 4x US
cwujek 4x US
seventenths 2X US
mithomas 4x US
Westley 4X, may go 8X US
Cantskienuf, 4X, US
tubesguy 2X, US
claiborne 2X US, may go up to 4X
groov 4x, -may go up to 8 if new price break is reached- US
niner 4X, US, may go up to 8X
JimT 4X, Canada
JimS 2X, US
pollypocket 4x, Canada
stolbovoy 4x, US
BobEllis 4X, US
Cambe 4X, US
genome 2X, US
sts9fan 2X, US
rdk845 2X, US
John Broskie 2X, US
I'd prefer a single wider heatsink. Carl's drawing is an 8.35" wide section.
If it's going air, the order will probably be delivered in a number of smaller packages rather than a 550 pounder. Still a lot of work to load though.
If it's going air, the order will probably be delivered in a number of smaller packages rather than a 550 pounder. Still a lot of work to load though.
It appears the 926 will require the fins to be placed horizontal if we chose a 14 inch length. That would be 8.35 tall by 14 inch length. I am more keen on the fins being vertical as in the conrad.
Does R-theta have a product we are after. For me it would have to be similar to the Conrad to be a go.
I like vertical fins
Does R-theta have a product we are after. For me it would have to be similar to the Conrad to be a go.
I like vertical fins
Re: Re: Re: Conrad heatsinks
I'm not sure what a rabbet buys you. It makes the heatsink look thinner (a purely aesthetic consideration) and you still have to screw down the lid to something, meaning you'll still have to use an L bracket or something anyway and you all have to agree on the same thickness. Here's mine without rabbet:
The top and back of my Aleph30 with Conrad sinks
But don't listen to me as I've already got my Conrads and won't be getting into this GB. Good product by the way.
dw8083 said:
I'm not sure what a rabbet buys you. It makes the heatsink look thinner (a purely aesthetic consideration) and you still have to screw down the lid to something, meaning you'll still have to use an L bracket or something anyway and you all have to agree on the same thickness. Here's mine without rabbet:
The top and back of my Aleph30 with Conrad sinks
But don't listen to me as I've already got my Conrads and won't be getting into this GB. Good product by the way.
California Heatsinks
I am keen on cheaper, raw aluminum heatsinks. The 8.35" X 12-14" would seem to be the ticket here. Yes vertical thermal flow is better, but if this meets the c/w requirement, I am in for these instead.
Every penny we save makes a us a little richer. This is not a poor mans hobby, even for DIY.😀
I am keen on cheaper, raw aluminum heatsinks. The 8.35" X 12-14" would seem to be the ticket here. Yes vertical thermal flow is better, but if this meets the c/w requirement, I am in for these instead.
Every penny we save makes a us a little richer. This is not a poor mans hobby, even for DIY.😀
If everyone were building the same amp and we determined the C/W adequate, then I would agree. I'd prefer to be overspec'd thermally so as to eliminate any chance of having to bias at less than optimum performance.
It is not the same as the 926, I'm in contact with the manufacture to get these made pretty much the same as the Conrad heat sinks, if anything they are a bit larger (with vertical fins of course 🙂). Custom milling is an option for about $2.50 more per heat sink, if some want this done I would be happy to leave it an option. I've emailed other heat sink manufacturers, and many have never gotten back to me or do not have comparable products (which is why I started this as a Conrad heat sink group buy). Accel seems to be the only one that will be able to give us the same heat sink for a better price, minus the black coating Conrads heat sinks have. They can have them I would be happy to paint heat sinks black for an additional fee, but I will have to find out what paint will work best and how much it costs. Thanks for your patience everyone, and thanks especially to Carl Huff for the suggestion! I'll let you know as soon as I have an update.
edit: One last thing. These heat sinks can also be cut to different heights. For those of you who want them to be even taller than the 6 inch standard I am going to use, it could be done. I obviously don't want 20 different heights, but if some people agree about a taller heat sink I am fine with getting some cut. Two or three different heights are fine with me....
edit: One last thing. These heat sinks can also be cut to different heights. For those of you who want them to be even taller than the 6 inch standard I am going to use, it could be done. I obviously don't want 20 different heights, but if some people agree about a taller heat sink I am fine with getting some cut. Two or three different heights are fine with me....
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