Aleph 3 Heat sink capability

[raincheck]

How hard can the Pass Aleph 3 chassis be pushed? Any one have specs on the Pass Aleph 3 thermals. Could you size it up...Aleph 5 output power.....could I increase the footprint by 4" all around could it handle it.

 

[Nelson Pass]

The Aleph 3 chassis is approximately .125 deg C.
per watt. Aleph 3's run about 200 watts, and have
about a 25 deg C temperature above ambient.

Better ventilation will improve this is bit, and you can easily
consider at 35 deg or so rise, so let's just say about 300
watts.

 

[raincheck]

Thanks Nelson!!
I picked up a bunch of aleph 3 heatsinks from a surplus shop. I was thinking of maybe increasing the footprint of the amp all around by 4"(cutting corner heatsinks).

These heatsinks seem perfect for designing into a small speaker cabinet...Im thinking of using the Aleph 3's as monoblock amps for surround sound channels. PGE will love me

I'd love to see the inside of the amp, its such a tight fit, How were the T03 mosfets mounted on the Aleph 3? Ive got the support bars that hold 2 mosfets...I imagine they were mounted on opposite sides. I dont see how the power supply fit in there. Is there a chance you could email a pic to raincheck@covad.net

Thanks for all that you do!!!!!!!

I can finally get rid of my Soundcraftsman pcr800's!!!!!!!!!!!

 

[GRollins]

The PCB layouts for the sundry Alephs are in the backs of their respective service manuals. The devices were mounted on all four sides of the amps. The power supply was in the bottom, with the active circuitry above.
Jeez, I wish I had places where I could just walk in and buy heatsinks...

Grey

 

[HarryHaller]

I'd love to see the inside of the amp, its such a tight fit

It is faily tight.

 

[csown]

That's a messy one...

The innards of that Aleph 3 looks really busy. Mine is really clean, not a lot of wires anywhere, and 3 or 4 wires from the capacitor bank to each amplifier board. Is that a default Aleph or have you been tinkering?

 

[jleaman]

That is a awsome desighn

that is awsome harry haller i like that youll see mine soon i hope..


CUBES rule

 

[HarryHaller]

been tinkering?

You're new around here aren't you?

H.H.

 

[jleaman]

who me Jason

??


???

 

[csown]

new around here....

Yep... not new to the DIY game, but pretty new to the innards of Passlabs gear.

 

[raincheck]

Harry,
Thanks!!! Could you describe some of the mods you did to your Aleph 3?

 

[HarryHaller]

heatsink redux

Based on Mr. Pass's heatsink numbers I decided to add more heatsink to the Tex-X which will idle at about 325 watts. Shown next to Aleph 3 for comparison.

 

[rtirion]

Now that's some serious heatsinking.
Did you manage to prye some sound out your Tex already?
I am still fighting with mine. Phasemarg.....

 

[jleaman]

That gold heat sink where would yuo get them from i want one for my project i would like to one per side what is a good place to get them BUT near canada i dont want to like pay million dollars for shipping ?

Jason

 

[HarryHaller]

Gold heat sinks

I have two more. Bought surplus and am not using other two at present. Too bad about the shipping cost to Canada from here. Maybe someone closer would want them.......

H.H. (heavy heatsinks)

 

[jleaman]

How much you want to sell them for and where do you live.. i might pay it ( theyll go to a great project that i want.)

 

[HarryHaller]

Heatsinks

Texas. How much do you want to pay?

 

[jleaman]

that was not my question

and i dunno wha t heat sinks sell for i have never boughten them befor

but i have lots hehe

Jason

 

[Peter Daniel]

More Alephs innards

For anybody interested I show here Aleph's 0 innards. Very cleverly done.

 

[Peter Daniel]

And this is how transformer was mounted.