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Old 15th September 2002, 03:27 AM   #21
cowanrg is offline cowanrg  United States
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Quote:
Originally posted by nar
I think R theta would be fine ,they have big big sinks
yeah, but r-theta isnt the cheapest out there...
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Old 17th September 2002, 03:12 AM   #22
Coulomb is offline Coulomb  England
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The heat sink in question posted a few notes back is definitely a Wakefield off the shelf part. The Wakefield part # 392-180AB or Digikey part # 345-1046-ND is very expensive here in North America. I have included a link to the PDF below. It is Fig. 14

Hope this helps.

http://info.digikey.com/T023/V5/0429.pdf

Anthony
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Old 18th September 2002, 02:56 AM   #23
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Default Heatsinks

CH2,

I suggest you look up Suntronics on the 3rd floor of Sim Lim Tower. They stock a wide of Semikron heatsinks and I came across one Model : P180(if I remember correctly!) which is 0.3deg/w per pair at about S$30/- each with a very professional finish. Assuming if you use 3 pairs, you will get 0.1deg/watt which is quite sufficient for the lower power Alephs Monoblock. I have built other amps with this and the design looks somewhat like a "diy Mark Levenson ML2"

My 2 cts

ckkt
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Old 18th September 2002, 07:02 AM   #24
CH2 is offline CH2
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Default Re: Heatsinks

Quote:
Originally posted by diyman
CH2,

I suggest you look up Suntronics on the 3rd floor of Sim Lim Tower. They stock a wide of Semikron heatsinks and I came across one Model : P180(if I remember correctly!) which is 0.3deg/w per pair at about S$30/- each with a very professional finish. Assuming if you use 3 pairs, you will get 0.1deg/watt which is quite sufficient for the lower power Alephs Monoblock. I have built other amps with this and the design looks somewhat like a "diy Mark Levenson ML2"

My 2 cts

ckkt
Thanks a thousand diyman.

Will check it out.

I just email Avvid singapore distribution office. But have not got a reply from them yet.

Thanks again

CH2
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Old 19th September 2002, 10:25 AM   #25
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Would anybody be able to state if 1 meter of Fischer SK 85 160*40 mm would be enough for 2 aleph 2 s ?

0,1meter is 0,6K/W so 1 meter should be 0,06 K/W * 600 W = 36 K

36K + 22 C = 58 C ?


Data at www.buerklin.com ---> search for 73 B 202
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Old 22nd September 2002, 04:27 AM   #26
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I am in Australia and could ship them from Indonesia, do you have contact details for the manufacturer?
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Old 22nd September 2002, 06:54 AM   #27
UrSv is offline UrSv  Sweden
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1 meter is only 0.06 if you cut it in 0.1 meter pieces and use them side by side. Should you use 0.2 meter pieces they would NOT be 0.3 each. Check the datasheet for your planned lengths per piece.
/UrSv
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Old 18th November 2002, 11:48 AM   #28
A'af is offline A'af  Indonesia
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Hi tjong, where you get/buy your nice heatsink in jakarta, it looks like very interesting, for your nice companion Thanks

cheers,
A'af
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Old 12th December 2002, 02:31 PM   #29
uli is offline uli  Austria
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Smile Fischer SK159

Hi, all,
as Im new to this forum, I say hello from Austria first.
Concerning heatsinks: I built heavily modified Aleph 2s
(1.2kVA Toroid, 2x25V 24A )with 5A idlecurrent.
I use Fischer SK159 heatsinks (200x300mm) 2 per
monoblock. They do their job (about 350W )pretty well
and dont cost you an arm and a leg! Price is about
400 for a stereo pair.
Uli
PS: www.fischerelektronik.de

http://www.fischerelektronik.de/_200...l_PDF/A_42.pdf
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Old 12th December 2002, 02:33 PM   #30
uli is offline uli  Austria
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Default SK157


Sorry, mistake:
Must be SK157! of course
the 159s are much too expensive!
Uli
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