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Old 10th December 2005, 07:28 PM   #1
troystg is offline troystg  United States
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Default Heat sinks for A-30 / Mini-A

Hi all-

I have a question on heat sinks for a mini-A / A-30.

After looking long and hard @ the A-30's horizontal heat sinks I "think" these mounted vertically would work.

I am looking for educated guesses to confirm or deny.

The ones I have are rated @ .5c/w for a 3" section. Mine are 8.5" tall.

I will post a few pics.
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Old 10th December 2005, 07:30 PM   #2
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Old 10th December 2005, 07:31 PM   #3
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Old 10th December 2005, 07:32 PM   #4
troystg is offline troystg  United States
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4 with layout..

Doah! Too quick... Waiting......
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Old 10th December 2005, 08:57 PM   #5
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Any chance you might share where you found these?

My semi-educated guess seems to think they would be ok.
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Old 10th December 2005, 10:41 PM   #6
tja is offline tja  Netherlands
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Default Re: Heat sinks for A-30 / Mini-A

Quote:
Originally posted by rabstg
Hi all-

I have a question on heat sinks for a mini-A / A-30.

After looking long and hard @ the A-30's horizontal heat sinks I "think" these mounted vertically would work.

I am looking for educated guesses to confirm or deny.

The ones I have are rated @ .5c/w for a 3" section. Mine are 8.5" tall.


OK, rule of thumb #1 says double the height, divide by 1,4 which gets us a 6" section rated @ .35K/W. Rule of thumb #2 says after 6" dont expect much more, so conservatively I'd say 8.5" piece should get you .30K/W, maybe .25K/W. Aleph 30 burns 100W/ch, so one sink per channel should give you a temperature rise of some 30C above ambient, which seems acceptable, depending on how hot it gets where you live .

Take
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Old 11th December 2005, 12:18 AM   #7
troystg is offline troystg  United States
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Default Re: Re: Heat sinks for A-30 / Mini-A

Quote:
Originally posted by needtubes
Any chance you might share where you found these?

My semi-educated guess seems to think they would be ok.
You'd be amazed at what plating shops throw away as scrap or junk.


Quote:
Originally posted by tja



OK, rule of thumb #1 says double the height, divide by 1,4 which gets us a 6" section rated @ .35K/W. Rule of thumb #2 says after 6" dont expect much more, so conservatively I'd say 8.5" piece should get you .30K/W, maybe .25K/W. Aleph 30 burns 100W/ch, so one sink per channel should give you a temperature rise of some 30C above ambient, which seems acceptable, depending on how hot it gets where you live .

Take
Rgr that and thanks. I thought they would but was hoping for a second opinion. If I have to I will turn down the bias a tad and listen.

I'm going to double that for the Krell KSA-50 clone.
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Old 11th December 2005, 06:38 AM   #8
uli is offline uli  Austria
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Default dynamic value

Hi Troy,
as the rating in K/W is dynamic (-> depends on the temperature
rise ) you should be careful. Rod Elliotts Heatsink Calculator shows
0,37 K/W for 30 degrees allowed rise above ambient (25-55).
Not enough for A30.

Uli

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