Aleph 3 Heat sink capability

raincheck · 9th June 2002, 11:03 PM

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 · 17th June 2002, 08:05 PM

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 · 20th June 2002, 03:55 AM

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 · 20th June 2002, 06:42 AM

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 · 20th June 2002, 08:10 AM

It is faily tight.

csown · 20th June 2002, 11:45 PM

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 · 20th June 2002, 11:46 PM

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

CUBES rule

HarryHaller · 21st June 2002, 01:11 AM

You're new around here aren't you?

H.H.

jleaman · 21st June 2002, 02:02 AM

who me Jason

??

???

csown · 21st June 2002, 02:03 AM

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

9th June 2002, 11:03 PM	#1
raincheck diyAudio Member Join Date: Dec 2001 Location: Avalon	Aleph 3 Heat sink capability 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. __________________ In The Days Before Rock 'n ' Roll

20th June 2002, 03:55 AM	#3
raincheck diyAudio Member Join Date: Dec 2001 Location: Avalon	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!!!!!!!!!!! __________________ In The Days Before Rock 'n ' Roll

20th June 2002, 11:45 PM	#6
csown diyAudio Member Join Date: Jun 2002 Location: Evanston, IL	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? __________________ -Chris

20th June 2002, 11:46 PM	#7
jleaman Banned Join Date: Apr 2002	That is a awsome desighn that is awsome harry haller i like that youll see mine soon i hope.. CUBES rule

21st June 2002, 01:11 AM	#8
HarryHaller Banned Join Date: Feb 2002 Location: Dallas,Texas	been tinkering? You're new around here aren't you? H.H.


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17th June 2002, 08:05 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	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.

20th June 2002, 06:42 AM	#4
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	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

21st June 2002, 02:02 AM	#9
jleaman Banned Join Date: Apr 2002	who me Jason ?? ???

21st June 2002, 02:03 AM	#10
csown diyAudio Member Join Date: Jun 2002 Location: Evanston, IL	new around here.... Yep... not new to the DIY game, but pretty new to the innards of Passlabs gear. __________________ -Chris

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