Heatsink question

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#121
#122
Here are my heatsinks (two amps)

Hope the file is there...(heatsinks.jpg)

Ralf
 

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#126
monster heatsinks

the weight is 80lbs/40kg per channel.
costs about 1000$.

i try to get to 40-50 watts per channel, but i need to buy two 3000VA transformers. it`s a challenge to go for 50 Watts, without burning the amp - or the cable-installation of my house!

to Ingoldstadt: ja ich kaufe zum teil meine wein bei Aldi
for the others: yes i like to buy sometimes my wine at Aldi... 😛

regards,

ralf
 
#128
DON'T MESS AROUND WITH THE BIG BOYS!!

U guys are in another league!

I'm doing a 15W version of SOZ with 12kg of heatsink /ch and 600VA transformer.

My house fuses don't like it very much @ 2x600VA, I imagine with 2x3000VA. I'll write a letter to the power company to install medium tension😀
 
#134
3000VA Transformers

PedroPO said:
DON'T MESS AROUND WITH THE BIG BOYS!!

U guys are in another league!

I'm doing a 15W version of SOZ with 12kg of heatsink /ch and 600VA transformer.

My house fuses don't like it very much @ 2x600VA, I imagine with 2x3000VA. I'll write a letter to the power company to install medium tension😀
Click to expand...

the transformers i use in moment are 1500VA`s. They work without problems in my house. But i have a variac connected to the Transformer...

Ralf
 
#135
Other topic ... but still a heatsink question.

So far I have not read anybody ask this question yet. So, let me ask here (note ... I did not start a new thread!).

As we all know, all the commercial Aleph amps has a few column of heatsinks at the back being chop off for clearance for installing the input/speakers jack. Won't those output transistors mounted on those heatsinks be a liitle bit hotter since it does not have as much surface areas for heat to dissipiate? And consequently the current flow (or at least the life span) on those transistors? I can't tell if those transitors are current source or gain source. Somebody please post more internal pictures showing the inside view of that particular piece of heatsink.

Or it just don't matter?
 
#137
fcel
Won't those output transistors mounted on those heatsinks be a liitle bit hotter since it does not have as much surface areas for heat to dissipiate?...Or it just don't matter?
Click to expand...
Oh it matters alright! I suspect that if you open the case you'll find that the mosfets aren't anywhere near that "finless" area.

Since we are on the subject. Do you guys mount your mosfets on the top part of the heatsinks to create thermal differential or in the middle to get more mass conductance? Do any anarchists in this forum mount the mosfets on the bottom part of the heatsinks? What do you guys do with your power resistors?
 
#138
Do any anarchists in this forum mount the mosfets on the bottom part of the heatsinks? What do you guys do with your power resistors?
Click to expand...

I like to spread mine out a bit to cover aall the bases, Thermal Dynamics, Heat Propogation, Inertial mass Equilibrium, Mass conductance, Temperature Differential, just through a big *** heatsink at it and don't worry about unless you find yorself using it as a space heater. 😀 😀 😀

Anthony
 
#139
Speaking of Heatsinks, I find myself having to abandon my A75 project as my cheap source for IRF230 & IRF9230 hase dried. $2 to $6 CAD. So now I gues I am going to have to resort to building an Aelph like everyone else 😉

The good news is I have a price of $1.15 CAD for IRFP244 ea. My only problem is will my chassis have enough thermal capacity. That and my 2x30 VAC super duper toroidal is a too small for an Aelph II.

My Chassis.

http://www3.sympatico.ca/taggs/images/P7280030.JPG

http://www3.sympatico.ca/taggs/images/P7280022.JPG
 
#140
controlled anarchy

I'll bite on the anarchy thing - I don't know much about thermodynamics, but I'm trying to figure out what would be wrong with mounting the transistors at the bottom. The way I see it, you want to use as much of the sink as possible. If you mount the transistors at the top, then you get a chimney effect of air flowing upwards, but the bottom of the sink is already cool(er) and you're wasting the chimney effect by sending more cool air past it. If you mount them on the bottom, it seems to me that it would be more efficient because the entire heatsink would be utilized and would be more uniform in temperature. sure the upwards moving air would already be warmed by the bottom of the sink, but the same would be true of whatever heat is present in the bottom of the sink when you mount the transistors at the top.

what am I missing?
 
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