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-   -   Aluminum For Chassis' (http://www.diyaudio.com/forums/everything-else/3604-aluminum-chassis.html)

vdi_nenna 16th May 2002 07:29 PM

Aluminum For Chassis'
 
Can you guys tell me where you purchase the aluminum sheets for your amp boxes? Some of you guys have the coolest looking amps! I just need 4 pieces for my amp. The heat sinks make up the side well enough, but I need a sturdy front, back, top & bottom.

I haven't been able to find anything locally. Is there anywhere nationally where I can order from?

Thanks!

Vince

Peter Daniel 16th May 2002 07:36 PM

I'm buying locally from metal store.

pmkap 16th May 2002 07:38 PM

FYI -

http://www.onlinemetals.com/

vdi_nenna 16th May 2002 08:09 PM

That's great, they'll even cut it for you.

Do you guys think 3/16ths of an inch is sturdy?

Thanks,

Vince

BrianGT 16th May 2002 09:39 PM

I bought 1/8" 6061 aluminum and it is suprisingly thick and rigid. It should be enough for all of your case needs.

I found a place that sold it by the pound, and it cost me $50 for all the aluminum sides/tops/bottoms for my two aleph 2 chassis.

--
Brian

vdi_nenna 16th May 2002 09:47 PM

I'm making a Rollins Micro-Aleph 10 watter. It will be a small foot print, e.i., taller then it is wide. I don't need much material.

Online metals will do the trick. :D

BrianGT 16th May 2002 10:04 PM

Online metals seems quite expensive. It would cost me at least twice as much as I found the metal locally in Atlanta, GA. I would suggest looking around and calling places from your phonebook. I call sheet metal places, and none of them sold aluminum sheet metal, but they referred me to a few places.

--
Brian
gte619j@prism.gatech.edu

jackinnj 16th May 2002 11:10 PM

Al source
 
In my youth I removed a "No Parking" sign from its perch and used same to craft a chasis for a ham radio rig. Wonderful stuff.

Jocko Homo 17th May 2002 12:03 AM

Yep, knew you were a real ham radio type. Keep up the good work.

1/8" is strong enough. Never hurt Threshold any.

Jocko

mrfeedback 17th May 2002 03:16 AM

Aluminium Coca-Cola Can Sound
 
Just some comment based on my observations.

In my experience, an amplifier using an aluminium cabinet will sound like it has an aluminium cabinet.
Ditto an amplifier using an iron cabinet.
Ditto an amplifier using a timber top cover.

For the experiment it is revealing for example to run an amp with top covering removed and take note of the sound.
Now place an aluminium, or steel, or timber top cover on the amp and note three different sounds.

What does this say ? - That there are field effects involved and they are not subtle.
IME this applies to heatsinks also.
My favorite amp has an iron cabinet and COPPER heatsinks.
I find this amp to be rather more pleasing over long term usage than an aluminium one.

Experiment two - take similarly sized sheets of AL, Fe, and Cu and tap them and note the character of the resulting sound.
I find that universally nobody likes the sound of aluminium.

To my ears an aluminium constructed amplifier gives a false, irritating and fatiguing characteristic to the highs, wrong mids, and diminished lows.

Experiment three - Take a piece of aluminium cooking foil and wrap it around the speaker leads - sonic results as above.

Years ago, I read an interview with Kostas Metaxus where he explained that he uses a particular non-magnetic grade of stainless steel because of these effects.
Stainless contains Nickel, so this is also out according to my ears.

It is worth noting that aluminium has no bio-chemical function in the human body, and is not used in the human body, and is indeed implicated in the causation of CRAFT* disease.

These are observations from long experience, both in experiment and servicing of all manner of audio equipment - maybe this is food for thought for a lot of us here.

Regards, Eric.

* - Can't Remember A F...... Thing disease - aka Alzheimers.


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