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Old 8th November 2003, 01:53 AM   #1
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Default Scaling Aleph-X up to 200w

Brian Donaldson has peak my interest with,

"Could you post a pic of the layout and some details. I would like to scale it up to 20 fets or so (5 per bank) and 200 watts."

What are the basics of just such a venture?

Regards,
Dan
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Old 8th November 2003, 03:29 AM   #2
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Dan,

I'm supprised you haven't seen this thread on "High Powered AlephX".
Aleph-X: High-Power Version

Going to 200w would be very much about handling the heat and going BIG. BIG heatsinks, BIG transformers, BIG supply caps, BIG bias currents, BIG electric bills.
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Old 8th November 2003, 03:38 AM   #3
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With the alephx bias excel spreadsheat it comes out to be about 500-600 watts of heat PER CHANNEL for 200 w into 4 ohms....22v at 10 amps bias? I think. I forget. You'd probably have to use all 24 fets per channel as well...to get adequate heat dissipation. I was actually planning on doing this...but then again...thats a LOT of heat and I don't have a big place! haha! Later!

-Matthew K. Olson
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Old 8th November 2003, 04:50 AM   #4
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Eah watts wrong with a little heat. I found some ugly but very efficent looking heat sinks in my favorite surplus shop. They are about 3"x8"x12" with tiny fins (1/16"x1/2" slots). The guy said that with forced air, they should be good for about 2kw. (I think more like 1kw.) But they are only $15.00 each. I'm thinking that with a well thought out open cell foam labyrinth for an air chase that you wouldn't hear a quiet fan or three. This scheme works well with 150 KW diesel generators.
I love the looks of huge masses of axtruded aluminum, but this may be a more space and cost efective way of making a inexpensive huge AX.
I'll post pics later.

I know there are purist among you that can be happy with 10W to listen to your chamber music. That won't cut it for me. I want in somewhat loud without sacrificing any dynamics. If you've watched any of yor favorite tracks on a scope as you listened, (I know you guys do it) you'ld see that you need at least 6 dbs of headroom.
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Old 8th November 2003, 05:03 AM   #5
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Pardon my rambling. I just finished working a 18 hr shift and need my diyaudio fix.
Corrections
$25.00 each
3x9x11
3/8" base
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Old 8th November 2003, 11:05 AM   #6
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Out of curiostiy, are more of those sinks for sale? How many? and do you take paypal? Thanks!

-Matthew K. Olson
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Old 8th November 2003, 11:30 AM   #7
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I'll look next time I'm there. I'm not trying to sell them, but I can buy and ship you some if they still have some
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Old 8th November 2003, 12:08 PM   #8
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Here's the idea I've been kicking around for the heatsinks of a 200w Aleph-X. I was thinking of 'emulating' Levinson's 33H' with a tall'ish design. I was pondering the use of a 20 inch R-theta 65340 in black for each side of the monoblock. A silver or natural colour 66153 for the front. And 1/4" plate for the rest. Here are the related pics.

Regards,
Dan

P.S. This is just me trying to think 'outside of the box' so be kind.

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