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Old 23rd April 2012, 03:47 PM   #11
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SiliconRay has responded that his heatsinks are,

300mm x 150mm x 50mm, base thickness is 10mm. This enclosure was originally designed for 30W x 2 class A amp.
12" x 6" x 2" but are vertical so therefore more efficient?

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Old 23rd April 2012, 08:25 PM   #12
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This is directly from the F5 article.

Heat Sinking
At 1.3 amps per channel, you will see idle heat dissipation of 62 watts. To keep the temperature rise of the heat sink to 20 deg C. above the ambient temperature, you will want a heat sink rated at about .6 deg C./watt for each transistor. An example of this would be a chunk of finned aluminum, with a series of 2” fins attached to an 8” by 6” base. You will need two per channel.

If you were to stack the above described heat sink, you'd have a 8"x12"x2" heat sink, or 16"x6"x2" side by side.
I build, therefore I am.

Last edited by vdi_nenna; 23rd April 2012 at 08:32 PM.
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Old 23rd April 2012, 09:03 PM   #13
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this depends on your ambient temp. you can have a sink temp of 55C.
so 55-ambient temp=max temp rise.
temp rise/power dissipation= sinks C/W rating.

i have ambient temp of 22C. so 33C max temp rise.
33/64=0.5C/W pr channel.
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Old 25th April 2012, 11:45 PM   #14
JZatopa is offline JZatopa  United States
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That antek worked great for my F5. I was even able to crank up the bias to about .65v (if I remember right). I did use the black one though.
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Old 26th April 2012, 06:19 AM   #15
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I used the black antek heat sinks from that case and have not had problems with bias up to 0.6. I can keep my hands on them indefinitely. I do have good ventilation though with the bottom being semi open.
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Old 27th April 2012, 05:02 AM   #16
Jason is offline Jason  Australia
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