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Old 3rd March 2006, 01:08 PM   #71
moe29 is offline moe29  United States
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... Steen's heatsinks look to be about right to me.

ZEN amps run HOT

The more heat you can dissipate the better.

I've read people were happy with product they got from

Conrad Heatsinks


We had a group buy a few years a go for some really nice R-Theta
heatsinks that measure 11"x11" and had 2" fins. I have a couple more
of these... when they're used up i'm going to try Conrad myself.

Or, you can always browse eBay.

...bottom line, the bigger the better when it comes to Class A heatsinks.
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Old 3rd March 2006, 01:13 PM   #72
Blues is offline Blues  United States
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bluemartini,

Check out the gallery at PassDiy and you'll have an idea of what you'll need. The Zv4 also dissipates 100W/ch.

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Old 3rd March 2006, 04:08 PM   #73
steenoe is offline steenoe  Denmark
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Quote:
ZEN amps run HOT
That is right, indeed
The heatsinks on the finished amp weigh about 9kg, thats over 18 lbs a piece. When the amp has been turned on the whole evening, it is just steaming out heat. Heatsinks can only be too small, I have never heard of a heatsink too big
Bottomline is: get the biggest one available.

Steen
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Old 3rd March 2006, 04:40 PM   #74
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Quote:
Originally posted by bluemartini
Ok looking at Steen's heat sinks, they look like over kill. Now I am trying to figure out the .25 CW thing in the Z9 write up, but an understanding has not come to me yet. Any one got a simple explaination?
Here's my understanding (someone please tell me if I got it wrong):

The 0.25 C/W is the celcius degrees of temperature rise above ambient per watt. So, a heatsink with this rating will rise 25 degrees C when dissapating 100 watts. Converting to degrees F and typical room temperature, this ends up being about 147 degrees F - pretty hot, but manageable.

So, let's take the largest standard Conrad heatsink (I'm strongly considering these, btw) - the MF35-151.5. This is rated at 0.21 C/W for a 80 degree C rise. Conrad points out that the sinks are less efficient at lower rise values. They indicate a correction factor of 1.45 or so for a 25 degree rise. So, this sink has a (0.21 x 1.45 =) 0.3045 C/W for a 25 degree rise. So, 100 watts will rise about 30 degrees or to keep it under 25 degrees means only 82 watts can be dissapated. So, one of these per channel may be too little.

Does that help?

I may choose to use two sinks per channel in a monoblock configuration. I like the idea of the flanged sinks, so I may go with two MF30-2F-151.5s per channel. I figure that ought to be enough. Not cheap going that route, however.

Paul Ebert
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Old 3rd March 2006, 10:29 PM   #75
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Moe29, thanks for the conrad site. That helped,

Blue, I get the point looking at passdiy, everyone uses big iron as Steen said nothing small. over kill is the way to go. Maybe I can heat my basement listening room this way and enjoy the music.

Paul. Thats for your explaination. I get it now. Your relating the devices back to the output and the c/w factor now makes sense to me. Your explanation was expressed as a formula will help me and others in the future.

Thanks to all

One last question. Is there not a DIY supplier in the USA that can supply heat sinks of this size. My limited search did not turn one up quickly.
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Old 3rd March 2006, 10:43 PM   #76
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by bluemartini
Moe29, thanks for the conrad site. That helped,

Blue, I get the point looking at passdiy, everyone uses big iron as Steen said nothing small. over kill is the way to go. Maybe I can heat my basement listening room this way and enjoy the music.

Paul. Thats for your explaination. I get it now. Your relating the devices back to the output and the c/w factor now makes sense to me. Your explanation was expressed as a formula will help me and others in the future.

Thanks to all

One last question. Is there not a DIY supplier in the USA that can supply heat sinks of this size. My limited search did not turn one up quickly.
you can always look at surplus stores

man-I'm waaaaaaaay far from US of A,but I regularly look at apex.yr page just for fun

looks that right now he have some good caps (around 10K UFs) and some good tunnel sinks
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Old 8th March 2006, 06:39 AM   #77
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Thanks Choky for the surplus site, I picked up two sets of the tunnel heatsinks today. They are not as large as the 11 x 11 x 2 that Moe29 indicated were the group buy, but if I use one pair on a monoblock, which Paul suggested in his post about the largest from Conrad, I think I will be ok.

The heat sinks are 12.5 x 4.75 x 2.375 inchs as I recall. The watts disapation are unknown as is the C/W factor, but the total size seems reasonable.

let me know if I am wrong

Again thanks for the help
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