Aleph 4 PCB Bulk Purchase

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#182
Heat sinks

Actually,

I am looking at some of the extrusions at M&M metals.

http://www.mmmetals.com/pages/extrusion profiles/extrusion tables/Flatback 4 & up.htm


I am thinking of gettibng some quotes on the following:

MM519922 - 12.2"x7" - may only need two per chassis

MM513809 - 10.3"x8" - again, may only need two

and the Wayne model


MM11645 - 6.6 x8" will need four

Which look good to you guys?

Dale
I talked to Keith Mandell and they don't really like small orders, but will do it if in stock.
 
#183
Dale,

It's funny ..... I called Keith Mandell yesterday and discussed the exact items that you just mentioned.

We've discussed the following:

1. The two item # that you just posted requires a minimum order of couple thousand dollars.... there is none in stock .... so, we can pretty much forget about those two.
2. I I remember correctly, there is plenty in stock for the ones that Wayne uses. It will take about 2 weeks to get the order processed ..... cut it from a 8' extrusion, anolized etc and then ship to customer ...
3. When I spoke to Keith, he's very anxious to sell it to me - I did told him that I'm a hobbyist. I told him that we've a little discussion here and I'm not ready to order yet.
 
#186
Heatsink height

Guys,

Suggestion on the heatsinks height ......

Assuming the width of the case to be 14" (includes heatsink fins), what should the height (vertical distance from the bottom plate) of the case or heatsink be for the amp to look good .... looking at it from the men's point of view? I'm thinking of ordering it in 12" height since it does not cost much more than 9" height.
 
#187
Dale,

John Snowden is a great guy. I stopped by Victoria Magnetics today to pick up a Leach Amp Chassis Kit for a friend, and talked to John for a bit. He does a great job on custom transformers.

I picked up my metal today. I picked up 4 - 9"x18" 1/8" thick and 4 - 9"x8" 1/8" thick 6061 aluminum for $86 including tax. The place I went to charged by the pound. They are called Metal Supermarkets, and are located near Atlanta GA.

My heatsinks are 8"x9"x2.6" and I am using 4 per chassis. My case dimensions including heatsinks are 8"H x 14"W x 18"D/

I should have my heatsinks tapped today for the screw holes, and start putting on the angled brackets to hold the panels on them.

It should come together quite nice. I thought I would have to use some U-channel under the transformer to support the weight, but the 1/8" 6061 aluminum does not really flex with the weight on it. I am suprised how thick 1/8" is. I was planning on using 1/4, but it looked too thick. For the front, I might get some 1/2" for the front later, but it would have cost me around $80 for the two front pieces, and I want to save the money for later.

I received more money orders in the mail today, and I will e-mail those who I have received payment from later tonight, along with an address confirmation.

Good luck with your chassis.

--
Brian
gte619j@prism.gatech.edu
 
#191
I was just planning on sticking it through the hole sized measuring device that you use to measure what drill bit to use and drill the hole in the center of the finished case.

I have a lot of work until I get that done. I have my holes marked in the heatsinks, and the L brackets cut to size, and I will try to drill and tap the holes today. I will post pics of my progress this weekend.

I was planning of brushing the aluminum with very fine steel wool, and putting a very thin coat of clear coat on it, instead of the anodizing, and I can get it anodized later, should I have the cash. My heatsinks are clear anodized.

--
Brian
gte619j@prism.gatech.edu
 
#192
Brian: On a different subject here for the next 1 or 2 posts, did you use a 4 gang VR for your input and output volume control for your BOSOZ? Can I have the part #, vendor name and price? I can't find one, so I'm using (2) 2 gang VR for the volume control. Thanks.
 
#193
For the BOSOZ:

I mounted the boards to a temporary chassis using metal standoffs. I hooked up the transformer to the power supply.

For the input and outputs, I have used no potentiometers. I just have it tied the inputs and outputs to RCA connectors for now. I have a dolby digital decoder that I use for the digital out of my cd player and the rca out from it. It has a remote and volume control. I am just going to use it for now, and get some fancy potentiometers later.

EDIT: Once I get my aleph done, I will change the rca outputs to the neutrix xlr connectors that I bought. I am going to make a dac next year, and will probably add potentiometers to the BOSOZ, or make a passive pre-amp.

--
Brian
gte619j@prism.gatech.edu
 
#197
I had a long day at work, and didn't have time to finish them. It will look like the pic in Wayne Sankey's gallery:

An externally hosted image should be here but it was not working when we last tested it.


I will try to take pics on Friday. I left my stuff in Dr. Leach's audio lab, where I was working on it.

EDIT: I used 1/8" thick L brackets that are 1 1/4" x 1 1/4". I also ran them along the whole bottom of the chassis, as I want the most support for the bottom. I am just working on the bottom and heatsink sides now. I will use 1/16" thick .75 x .75 for the front and sides.

--
Brian
gte619j@prism.gatech.edu
 
#199
Brian: Since nobody asked ....... let me ...... are you laying out the output boards ..... using that same software? The main boards will be ready in a couple days ..... and it looks like your case will be ready by this weekend.
 
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