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Interested in building an Aleph, tons o' newbie questions
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Old 26th September 2003, 03:05 AM   #11
Brian Donaldson is offline Brian Donaldson  United States
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oops I forgot the pic
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Old 26th September 2003, 03:15 AM   #12
moe29 is offline moe29  United States
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we need better close ups Brian!!

where do you get those turret terminals??

which amp is that one? an AX??
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Old 26th September 2003, 03:37 AM   #13
Brian Donaldson is offline Brian Donaldson  United States
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Turret terminals came from Ace electronics in Houston. They have a website ace4parts.com or something like that. The amp is an over biases Aleph 2 with 8 fets per rail. The cheapy EI trannies hum badly, so I've orderd some toroids from Avel Lindberg. I plan to do a pi filter that simulates les than .3v ripple. Thats a true feat with 5 amps of bias. My camera doesn't work so well after the last fishing trip, but here's a close up.
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Old 26th September 2003, 03:40 AM   #14
jleaman is offline jleaman  Belgium
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for a aleph that looks kinda iffy. them heat-sinks are kinda small. don't you think.?
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Old 26th September 2003, 03:55 AM   #15
Brian Donaldson is offline Brian Donaldson  United States
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It's 14" deep, 11" tall with 2" fins. times 2 per channel. After 4 hours of music with 5A bias +- 50V temp was 160 deg F at base of the fins. After the case is all finished, there will be a fan on the back pulling fresh air in and exausting through the row of holes drilled between the fets to keep the innards cool and help move air over the sinks.
When I last listened, they were setting on the floor and you could feel the heat when you walked by. Also after listening for 4 hours the room they are in was noticably warmer than the other rooms in the house.
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Old 26th September 2003, 03:58 AM   #16
Brian Donaldson is offline Brian Donaldson  United States
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Here's pic of temp probe packed in tissue. The psu is a mess, but I had to hear them, so I assed it together for a test run. They sound amazing. I heard details and black background that I had never heard before. I thought it was partly due to shear euphoria to having them working.
The next day I rolled my eyesores (as my wife put it) back into my office an hooked up my old Kenwood. I haven't wanted to listen to the stereo lately because it sounds like sh!t after hearing the Alephs. I'm now waiting on new toroids to redo the psu and finish the rest of the chassis.
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Old 26th September 2003, 04:13 AM   #17
Brian Donaldson is offline Brian Donaldson  United States
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Back to Jonathan's topic. Heat sinks, power transformers and caps are 80% of the cost. The driver boards are almost interchangable with only a few component value changes for different rail voltages.
I started researching this project to save some money, but I've spent 5 times what I thought I would, but got 20 times more amp than I ever thought I would want.
The key with class A is finding a way to get rid of all of the heat. You need lots of surface area and enough metal to carry the heat from the fets to all of that surface.
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Old 26th September 2003, 04:37 AM   #18
moe29 is offline moe29  United States
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Plus the 50 unaccounted for trips that one makes to Home Depot
for what-nots (screws, electrical stuff, taps, wire, etc...)!

so, allow for some overage, or do like me... take about 8 months
to finish the project, spread the cost out over time! I'm sure there
is some accounting term for that, but i failed Accounting 1! (The
girls in the school of Fine Art were more interesting anyway)
building an Aleph should be a labor of love anyway - who cares
how much you spend... as long as there is some beautiful music
being had at the end!
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Old 26th September 2003, 05:06 AM   #19
cowanrg is offline cowanrg  United States
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i agree with that 100%!!!!!

there are millions of things you end up needing. its nice though, after a few projects, you tend to have more laying around.

im at the point right now where i have a few different types of screws. my advice is when you are first starting out, instead of getting 10 or so of the screw you need just for the project, break down and get a box of every screw you need. you wil have leftovers, and unless its an exotic one, you will probably need it down the road (especially if you DONT get a box, you will need it MORE).

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Originally posted by moe29
Plus the 50 unaccounted for trips that one makes to Home Depot
for what-nots (screws, electrical stuff, taps, wire, etc...)!
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Old 26th September 2003, 11:25 AM   #20
Brian Donaldson is offline Brian Donaldson  United States
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I'll second that comment. Find a really good harware store that has things like allen cap screws and only buy by the box. you'll save a ton of money over time and you'll have matching screws throughout. Also stay away from house brand and cheap taps and drill bits. They'll break at the worst time and make your project a huge source of frustration.
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