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Old 18th October 2004, 02:52 AM   #1
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Default Aleph Heat Up Time?

A question regarding the estimated 1 hour heat up time of the fets for an Aleph 2.

If I have a lot of "bulk" aluminum in my cabinet, can I expect that the warmup time required for optimum fet temp to take longer than for a "normal" non-massive cabinet?

Thanks.
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Old 18th October 2004, 03:11 AM   #2
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No question about it. If you're using more massive heatsinks, it will take longer for them to reach thermal equilibrium.
I water cool two pairs of Aleph 2s and it takes two hours or more for everything to get warm. There's quite a bit of mass, and only 1200W to heat it.
(Ahem.)

Grey
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Old 18th October 2004, 03:30 AM   #3
jwb is offline jwb  United States
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I use a relatively small heat sink and a fan. The fan is temperature controlled, and doesn't start until the amp is at operating temperature. This way the amp heats up quickly.

If your water-cooled unit takes so long to heat up, why not install a thermostat?
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Old 18th October 2004, 04:11 AM   #4
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I could, but it's a low priority with me. I've got so little time to spend on audio right now that I really try to keep stuff like that to a minimum.
My latest time waster began two weeks ago when a kid ran a red light and smashed my car to flinders. (Body work alone= $6000. The engine may need repairs also--separate bill. Fortunately, his insurance is covering things.) It has--so far--taken about a week of my time just to deal with various aspects of the wreck. Time I can ill-afford. That's on top of selling another story (yea!), but not having another one ready to go out (boo!). And wouldn't you know, a recording industry/audiophile guy wants me to design/build him a preamp. Just got that dropped on me Saturday...and oh, by the way, he's not in any hurry, but can I have a prototype ready by next weekend or so? If I don't go crazy in the meantime, it could be a lot of fun, seeing as how this fellow records all over the southeast (symphonic stuff...hot dog! also less formal things--need to convince him to do more jazz) and could potentially want a whole slew of things later on if he likes the line stage.
And that's in addition to all the other stuff I'm trying to deal with.
So thermostats will have to wait until I can get some of those elves that made the cobbler's shoes.

Grey
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Old 18th October 2004, 04:22 AM   #5
jleaman is offline jleaman  Belgium
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I'm wondering what kinda time's it will take for my aleph 2's to warm up as they both * mono block's * have 4 x 8" x 8" heat sinks per mono block..
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Old 18th October 2004, 04:51 AM   #6
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With heatsinks that small, they'll probably be cherry red in about 5 minutes. Unless I misunderstood, you might want to consider fans.

Grey
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Old 18th October 2004, 05:38 AM   #7
jleaman is offline jleaman  Belgium
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12 fets 3 per heat sink there 8 inches x 8 inches and about 2 inches thick. 1/4 inch back plate. 4 heat sinks per mono block fet with a 1kva totoidal with 250k capacitance per rail : O )
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Old 18th October 2004, 06:08 AM   #8
jwb is offline jwb  United States
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Great, but how much power is dissipated in each FET?
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Old 18th October 2004, 10:05 PM   #9
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My question is more along the lines of how many degrees/watt the heatsinks are. They sound awfully small for an Aleph 2.

Grey
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Old 18th October 2004, 10:15 PM   #10
jleaman is offline jleaman  Belgium
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Ill post a picture tonight. there not small. and if they are.. then i go to myother great idea of the new chassis design to keep them cooler.. I like my new idea but ill have to see... ill post picture's ..
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