| 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 |
| It is faily tight. |
|
|
| csown |
| 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? |
|
|
| JasonL |
that is awsome harry haller i like that youll see mine soon i hope..
CUBES rule |
|
|
| HarryHaller |
You're new around here aren't you?
H.H. |
|
|
| JasonL |
who me Jason
??
??? |
|
|
| csown |
| 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 |
| 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..... |
|
|
| JasonL |
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 |
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) |
|
|
| JasonL |
| 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 |
| Texas. How much do you want to pay? |
|
|
| JasonL |
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 |
| For anybody interested I show here Aleph's 0 innards. Very cleverly done. |
|
|
| Peter Daniel |
| And this is how transformer was mounted. |
|
|
| HarryHaller |
The Aleph 3 also uses U shaped channels to couple the transistors to the heatsinks in a very simular manner. The TO-3 outputs are soldered and screwed to the output and current source boards and to these U channels. The top and bottom panels are also screwed to the U channels. The transformer and power supply board are bolted to the bottom panel. It is all very sturdy and the top and bottom panels act as heat sinks also. Great pics.
H.H. |
|
|
| Peter Daniel |
The front end board was mounted through heat sinks to top cover. The top cover had 2 holes for trimpot adjustment. Also very clever. Somehow it seems that the version presented in service manual is somewhat diferrent with less output devices and probably differernt config. Also too bad that American magazines don't publish pictures like that.
That amp was my inspiration for A75 monoblocks. It also uses 24 output devices.;) |
|
|
| Peter Daniel |
| This picture is probably better. Notice Panasonic-Matsushita resistors everywhere. They are probably pretty good if that amp got such favourable review in Stereophile.;) |
|
|
| gilid |
| quote: | Originally posted by JasonL
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 |
Jason,
What part of Canada do you live in? There are some really good surplus outlets in the Montreal/Ottawa/Toronto area, where with a little bit of patience, you can find just about anything you need. |
|
|
| JasonL |
do yu have any links to them or any phone numbers im interested in getting some nice heat sinks for my aleph 5 projects im building some cubes mono blocks and need heat sinks
..
ill post some pics of my heat sinks i have and see what you think...
J' |
|
|
| JasonL |
3
these came out of my 2nd inkel amp that i had from dj'ing i fixed one but the other was for parts had a thermal problem the sencers didnt turn on the fans and cooked all teh out puts and there is like 10 per channel @ 23.00 each so i just used some parts and got it going now it is for sale hehe
1500 watts briged amp with balanced inputs professinal dj amp
hehe |
|
|
|
