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Old 17th August 2010, 12:51 PM   #1
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Join Date: Feb 2005
Default Aleph2 project

I am very determined to start Aleph 2 for my Open Baffle
We all tracks (mono):
2x36V/1500WA transformer;
MUR3020 X 8
22 000 -22 000 - 2.2mH - 22000-22000 (FTCap)
12 matched FET IRFP240

I found the Heatsinks 400x300x83mm :

75.photobucket.com/albums/yy32/Buffalo22/?action=postupload

Please tell me if your heatsinks is sufficient for a single mono channel?
Thanks!
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Old 17th August 2010, 09:20 PM   #2
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If they were cut to 400 wide x 150 tall you would greatly improve the dissipation efficiency. Each should comfortably handle 150 Watts. I assume your rails are around 50V, so a bias of .500 amps per fet would be 300 watts total. You can probably increase it, just monitor your temp.
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Old 17th August 2010, 09:26 PM   #3
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Your link goes nowhere.
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Old 18th August 2010, 11:58 AM   #4
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Quote:
Originally Posted by Bill Fuss View Post
Your link goes nowhere.

Excuse Bill

Image hosting, free photo sharing & video sharing at Photobucket

Regards,
Vitaly
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Old 18th August 2010, 12:07 PM   #5
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Quote:
Originally Posted by Bill Fuss View Post
If they were cut to 400 wide x 150 tall you would greatly improve the dissipation efficiency. Each should comfortably handle 150 Watts. I assume your rails are around 50V, so a bias of .500 amps per fet would be 300 watts total. You can probably increase it, just monitor your temp.

Hi Bill ,
I would not want to cut them
I have four pieces, I use two heatskins 400x300x83 channel.
I think it be okay?

Regards,
Vitaly
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Old 18th August 2010, 01:01 PM   #6
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Hi Vitaly,
Those are very impressive looking heatsinks. I am very familiar with the Aleph amp design but I am not intimately familiar with the Aleph 2. Can you tell me what the rail voltages will be and what the target bias current is. I'm sure you will be able to approach the design values with those.
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Old 18th August 2010, 01:19 PM   #7
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I believe I found what I was looking for. Yes, those heatsinks should be fine dissipating 150 watts a piece for a total of 300 watts per channel. Have fun and tell us your thoughts after completion.
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Old 18th August 2010, 02:55 PM   #8
Gyuri is offline Gyuri  Hungary
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I believe it very nice Aleph2 will be made from these substances. The first post did not show us that four pieces there are from these wonderful heatsinks. I think that they are fit for the purpose perfectly. The beautiful profile of heatsinks is particularly with this forming. According to me to the heatsinks lower third you have mount the transistors.
My monster Aleph apparatus approximately a kilowatt of power dissipated.
My good old-new Aleph
Fairly much it's hot.
It is consists of six pieces of 40cm*10cm*6cm cooling flange per side.
So this 40cm*60cm*6cm heatsink dissipate 500W per side
I do not switch it on, only in winter, at the time of Christmas.
We wait for the developments curiously.

Wacky Gyuri
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Old 18th August 2010, 08:46 PM   #9
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Quote:
Originally Posted by Bill Fuss View Post
Hi Vitaly,
Those are very impressive looking heatsinks. I am very familiar with the Aleph amp design but I am not intimately familiar with the Aleph 2. Can you tell me what the rail voltages will be and what the target bias current is. I'm sure you will be able to approach the design values with those.
hi, i'm building aleph2's my self this days. and for the rail voltages, it's +/- 45V with 2x37V trafo.
i'm going to run 2x40V trafo, 8x33,000uF caps and CRC filter.
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Old 19th August 2010, 10:06 AM   #10
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Quote:
Originally Posted by Gyuri View Post
I believe it very nice Aleph2 will be made from these substances. The first post did not show us that four pieces there are from these wonderful heatsinks. I think that they are fit for the purpose perfectly. The beautiful profile of heatsinks is particularly with this forming. According to me to the heatsinks lower third you have mount the transistors.
My monster Aleph apparatus approximately a kilowatt of power dissipated.
My good old-new Aleph
Fairly much it's hot.
It is consists of six pieces of 40cm*10cm*6cm cooling flange per side.
So this 40cm*60cm*6cm heatsink dissipate 500W per side
I do not switch it on, only in winter, at the time of Christmas.
We wait for the developments curiously.

Wacky Gyuri
Aleph 9 very nice, BIG !
After reading your post, I started with entuziazm to give holes to cut, to work on PCBs.
Thanks so much Gyuri for your encouragement and keep in touch when ready

Regards,
Vitaly
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