Pass Aleph 4 Project out !!!

promitheus · 30th January 2001, 10:02 PM

Hi there !
Everybody should check the new Aleph 4 project that´s posted in the Passlabs site.
It looks cool and a very good job.
Soon pcb´s.
A lot of thanks to Mark Finnis who posted his amp.

JoeM · 31st January 2001, 04:02 PM

gee you were quick!

100 Watts @ 8 Ohms of single ended pure class A! This beast was worth a fortune. On the site the builder says he will forward the .pdf files of the PCB to "desmond". Is this a kit re-seller?

Thanks for the heads-up. BTW the site is here: http://www.passlabs.com/gallery/a4-p1.htm

vdi_nenna · 31st January 2001, 04:30 PM

I think Desmond is someone at Pass Labs. He was refering to the PDF that is already on the site. It must have need to be post after the initial info was sent to Pass Labs.

mefinnis · 5th February 2001, 02:22 AM

Hi Folks,

FYI. Desmond Harrington is the webmaster and PR person for PassLabs. If you want any info from PL he should be your first port of call rather than NP himself.

Being the said builder of the Aleph4 a little info. I am not a reseller. Anyone is welcome to any info re the amp.

You can get a PDF from the projects gallery which has the necessary info:

http://www.passlabs.com/images/gallery/a4-p1-pcbs.pdf

You can use IFRP244, IFRP240, IRF244 ..... NP states it doesn't matter. IFRP240s are what he would (and does) use now.

NOTE: there was an ERROR in the first PDF which omitted a join from C9-R26 to the base of Q3. I have sent Des a replacement file which should be on the site as we speak.

promitheus · 5th February 2001, 08:21 AM

The Irfp 240 I think are the easiest to find.
The only problem is they need matching which is easy to do with 1 resistor and a good digital multimeter.
The only problem is that they cost more the input ones.
It´s just something you have to do if you want your amp to be perfect. That´s the whole idea anyway.

doktor · 7th February 2001, 09:38 PM

Really thanks to Mark Finnis and excellent job on the Aleph 4. I am about half way though my A40 and want to put it on the back burner and start an Aleph.

promitheus · 7th February 2001, 10:46 PM

Yeah it looks great !
I am still trying decide what to do ?
The thing that troubles me the most is the box.
But its a big help to have ready pcbs.

Bksabath · 16th December 2007, 09:06 PM

100 W class A Yees please!

I was triing to get the schematics.

But could not folow the tread.

Could you post them please.

PS I have started to work on the heat sinks

Plan is to use 2mm copper sheet and 4 mm thick buss bar + fans
for which is quite easy to make a speed controler (speed increse with temperature )

So far cost is around £30 for the copper (I have same good sources)

Copper is a beter conductor than alluminium it does oxidise with time but it can be Gold Silver or Crome plated again I shuld be able to get this cheap.

I will let you know but I am stuck witout the schematics.

mefinnis · 16th December 2007, 09:17 PM

This is an OLLD thread ...

Easiest to get at from my own page:

http://www.users.on.net/~mefinnis/passlabs/aleph4.htm

Cheers

Mark

JEKYLL · 17th December 2007, 08:33 AM

The links to the PassLabs site doesn't work on my PC.
How can I see the pictures?

5th February 2001, 02:22 AM	#4
mefinnis diyAudio Member Join Date: Feb 2001 Location: Adelaide, Australia	Aleph4 Info Hi Folks, FYI. Desmond Harrington is the webmaster and PR person for PassLabs. If you want any info from PL he should be your first port of call rather than NP himself. Being the said builder of the Aleph4 a little info. I am not a reseller. Anyone is welcome to any info re the amp. You can get a PDF from the projects gallery which has the necessary info: http://www.passlabs.com/images/gallery/a4-p1-pcbs.pdf You can use IFRP244, IFRP240, IRF244 ..... NP states it doesn't matter. IFRP240s are what he would (and does) use now. NOTE: there was an ERROR in the first PDF which omitted a join from C9-R26 to the base of Q3. I have sent Des a replacement file which should be on the site as we speak.

7th February 2001, 09:38 PM	#6
doktor diyAudio Member Join Date: Dec 2000 Location: Saskatoon, Sk, Canada	thanks a bunch Really thanks to Mark Finnis and excellent job on the Aleph 4. I am about half way though my A40 and want to put it on the back burner and start an Aleph.

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30th January 2001, 10:02 PM	#1
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	Hi there ! Everybody should check the new Aleph 4 project that´s posted in the Passlabs site. It looks cool and a very good job. Soon pcb´s. A lot of thanks to Mark Finnis who posted his amp.

31st January 2001, 04:02 PM	#2
JoeM diyAudio Member Join Date: Jan 2001	gee you were quick! 100 Watts @ 8 Ohms of single ended pure class A! This beast was worth a fortune. On the site the builder says he will forward the .pdf files of the PCB to "desmond". Is this a kit re-seller? Thanks for the heads-up. BTW the site is here: http://www.passlabs.com/gallery/a4-p1.htm

31st January 2001, 04:30 PM	#3
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA Blog Entries: 1	I think Desmond is someone at Pass Labs. He was refering to the PDF that is already on the site. It must have need to be post after the initial info was sent to Pass Labs.

5th February 2001, 08:21 AM	#5
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	The Irfp 240 I think are the easiest to find. The only problem is they need matching which is easy to do with 1 resistor and a good digital multimeter. The only problem is that they cost more the input ones. It´s just something you have to do if you want your amp to be perfect. That´s the whole idea anyway.

7th February 2001, 10:46 PM	#7
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	Yeah it looks great ! I am still trying decide what to do ? The thing that troubles me the most is the box. But its a big help to have ready pcbs.

16th December 2007, 09:06 PM	#8
Bksabath diyAudio Member Join Date: Dec 2007	100 W class A Yees please! I was triing to get the schematics. But could not folow the tread. Could you post them please. PS I have started to work on the heat sinks Plan is to use 2mm copper sheet and 4 mm thick buss bar + fans for which is quite easy to make a speed controler (speed increse with temperature ) So far cost is around £30 for the copper (I have same good sources) Copper is a beter conductor than alluminium it does oxidise with time but it can be Gold Silver or Crome plated again I shuld be able to get this cheap. I will let you know but I am stuck witout the schematics.

16th December 2007, 09:17 PM	#9
mefinnis diyAudio Member Join Date: Feb 2001 Location: Adelaide, Australia	This is an OLLD thread ... Easiest to get at from my own page: http://www.users.on.net/~mefinnis/passlabs/aleph4.htm Cheers Mark

17th December 2007, 08:33 AM	#10
JEKYLL diyAudio Member Join Date: Jan 2004 Location: FRANCE	The links to the PassLabs site doesn't work on my PC. How can I see the pictures?