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Old 31st July 2002, 04:43 PM   #1
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Default PassDIY Gallery

Some of the projects I have seen on this fanatical forum are just fabulous, please feel free to send your pics to our webmaster@Passdiy.com so we can display your works in our gallery! Don't be shy.
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Old 2nd August 2002, 03:38 AM   #2
fcel is offline fcel  United States
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Karen,

Speaking of pictures, below is a quote from myself from another thread titled "heatsink question". Could you ask your boss to see if there is a "story" behind the way the heatsink was shaped at the back other than needing space for the in/out/ac jacks? Thanks.
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"Other topic ... but still a heatsink question.

So far I have not read anybody ask this question yet. So, let me ask here (note ... I did not start a new thread!).

As we all know, all the commercial Aleph amps has a few column of heatsinks at the back being chop off for clearance for installing the input/speakers jack. Won't those output transistors mounted on those heatsinks be a liitle bit hotter since it does not have as much surface areas for heat to dissipiate? And consequently the current flow (or at least the life span) on those transistors? I can't tell if those transitors are current source or gain source. Somebody please post more internal pictures showing the inside view of that particular piece of heatsink.

Or it just don't matter?"
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I was wondering ..... why not have the lower 1/3 of the chassis be free of heatsinks at the back so that there is more room for in/out/ac jacks. One would not be able to see the "missing" heatink from the top and it would still look symetrical on all sides and thus looks even better. I'm not critizing. Just curious. Have always wanted to ask this question.
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Old 2nd August 2002, 07:28 AM   #3
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Well, i'm rebuilding my amp in a case inspired by the Aleph series (god i love that look ). As you said, my solution to leds and backpanels was simply to left 2cm tall windows in the front and the back of the amp, instead of skipping a pair of fins. Perhaps on the Aleph it was easier/cheaper to make it that way, perhaps it looked better or *maybe* it gives a bit more surface area. On my particular amp all the power devices share the 4 sides of the "cube" so it's not much of a concern really.

Alephs look so damn sexy anyway
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Old 2nd August 2002, 03:33 PM   #4
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fcel:
which heatsink are you referring to? Sorry, I couldn't find your original question, if you like email me Help@passdiy.com. Thanks.
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Old 2nd August 2002, 04:44 PM   #5
fcel is offline fcel  United States
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karen,

I'm sorry to be so confusing by quoting myself ....

I'm referring to the Aleph series power amplifier heatsink.

My questions above is those sentences located in between the 2 lines across the page.
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Old 2nd August 2002, 05:06 PM   #6
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fcel, only the master knows ! I can email you a couple of Aleph 3 pics, referencing the position of the power transistor bars.
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Old 2nd August 2002, 05:10 PM   #7
cowanrg is offline cowanrg  United States
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this may help you out... an auction for some aleph2's, but GOOD pics of it. if you look really close, you can see the mounts of the transistors. should give you a good idea ofhow they were mounted.

http://cgi.audiogon.com/cgi-bin/cl.p...ran&1032640144

if link doesnt work, do this:

goto http://www.audiogon.com
search for "aleph 2" its item #1032640144

hope that helps out.
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Old 2nd August 2002, 05:58 PM   #8
fcel is offline fcel  United States
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cowang,

Did you said you have pictures of the transistors mounting location? I don't see it from the link that you provided. Thanks anyway.

What I would really like to see is the internal pictures showing that particular piece of heatsink and circuit board from the inside.
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Old 2nd August 2002, 06:53 PM   #9
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Default Heat Death

Hi all,

Heat distribution through a radiating surface is an interesting phenomena. Likewise the relationship between on chip temperature and device life span is a non-linear relationship.

One should keep in mind that the heat radiating surfaces provided by the heat-sinks are of benefit to other components and a safety issue as well.

The result being that in the case of the commercial Aleph, the solid state devices are not usually the service life limiting factor. Our best projection is that the power supply caps will last 15 to 20 years, and about 50 years out random device failure will become the predominate failure mode. Sometime after that the sun will cool to a white dwarf and the universe will experience heat death.

Cyclotronguy
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Old 2nd August 2002, 07:20 PM   #10
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The transistors with the trimmed heat sinks in the back did
run slightly hotter, but not enough to care.
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