Pro Amp With Auto On Function - Page 4 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #31 of 34 Old 03-19-14, 06:03 PM
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Re: Pro Amp With Auto On Function

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They are massive. Probably weigh more than 5 lb. They are from Wakefield Engineering, I think the SSR mounting surface is 5" wide by 7" tall. The extrusion I believe is 6" deep. These have been installed for a couple of years, so the memory is foggy!

The heat sink in the picture is not on its side, per se. It is arranged so that vertical air flow is not impeded by the fins. In other words, the fins are parallel to the flow of air. In this case the fan is mounted to the bottom of the heat sink, and blows upward. You can see the edge of a fan near the bottom of the pic.

The flow of heat by "natural convection" in air does go up due to differences in air density caused by temperature differentials. But the interface between the SSR and heat sink causes heat CONDUCTION. This is not affected by gravity. So the SSRs are just as happy to conduct heat to the heat sink 'sideways'.

I don't know what it is, but just hearing 5lb heat sinks makes me feel all warm, fuzzy and silly inside. That's awesome to see.

The conduction interface you speak of. Is that just between SSR and heat sinks or is it the same for for CPUs or GPUs, or power mosfets or?

In reality I could set my power boxes up so the relays are cooled by the amp fans
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post #32 of 34 Old 03-19-14, 06:35 PM
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Re: Pro Amp With Auto On Function

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I don't know what it is, but just hearing 5lb heat sinks makes me feel all warm, fuzzy and silly inside. That's awesome to see.
LOL! Nothing like thousands of watts to make a guy all goofy. About 2 million when the furnace is at full power.

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The conduction interface you speak of. Is that just between SSR and heat sinks or is it the same for for CPUs or GPUs, or power mosfets or?
Conduction works that way for anything. Including fingers/saucepan!

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In reality I could set my power boxes up so the relays are cooled by the amp fans
Sure could, as long as the air temp coming out of the amps is under 40C.
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post #33 of 34 Old 03-19-14, 06:43 PM
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Re: Pro Amp With Auto On Function

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LOL! Nothing like thousands of watts to make a guy all goofy. About 2 million when the furnace is at full power.


Conduction works that way for anything. Including fingers/saucepan!



Sure could, as long as the air temp coming out of the amps is under 40C.
For sure!

What is this furnace heating?
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post #34 of 34 Old 03-19-14, 10:08 PM
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Which relays? Mine? No, they are typical silicon solid state relays. Carlo Gavazzi. Very pleased with their performance.
Just wondered as they were white, and I had only seen the black variety.
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