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rhr9 20th November 2003 08:26 AM

Aleph 3
Hello everybody ,

As I have got some IRF150 , I would like to know if it is possible
to build an Aleph 3 with those FETs on the output stage .
Did some one try this experience ?

Thanks for your answers , Philippe.

MikeW 20th November 2003 02:12 PM

They will work. I have used IRFP 044,048,140,150,240,250,254,260's and some Fairchild HUF75652G3 in different PASS designs. The IRFP's vary a little in sound, but the circuit stays the same. I only had to change one resistor for the Fairchild. :D

Yonnat 20th November 2003 08:11 PM

Salut RH9,

I am finishing my Aleph3 for the next week, I use IRFP244 as needed but have a look on the datasheet for your IRF150, make comparisons about the power, current and tension maybe they will be good, Mike thinks so and he has tried them, for myself I try to be cloth to the original, if you want to buy the IRF 9610 and IRFP240 look at "" their prices are very cheap (0,50E for the 9610).

Good luck l'alsacien.


rhr9 21st November 2003 08:43 AM

thanks for all your replies , as soon as I will have enough time , I will build my amp.

Just a remark , I am very astonished to see all these amplifiers with no DC protection on the outputs ! Are they unnecessary ?
I don' t think so ...

So long , Philippe.

Yonnat 21st November 2003 05:08 PM

DC or not DC
Hy Philippe,

yes this amps are not protected from DC at the output, I ask myself the same question and Mr Pass said he has never heard a return with a DC problem since he builds the Aleph, so I do the same, build your amp with care.
For the PCB, I do it at my own with a standby mode if you are interested you can send me a email, you find my email on this site, I am living in a town near Strasbourg.


rhr9 23rd November 2003 05:05 PM

Hello YONNAT ,

Did you get my message on your personal email ?
I am interested by your PCB but I have to finish other projects before I start bo build my Aleph.

Best regards , Philippe.

Yonnat 23rd November 2003 07:43 PM

Message arrived
Hy Philippe,

yes I got your message, I will reply to you on your personnal email I think on monday evening, this weekend I had a lot of things to do that"s why my silence.


Bricolo 23rd November 2003 07:57 PM

Salut les alsaciens ;)

UrSv 23rd November 2003 08:06 PM


Yonnat 23rd November 2003 08:08 PM

Hy Bricolo,

it seems that we are a lot of alsacian peoples on thid site and I know many other of us who are builind Pass's projects and they are not member of diy.

Good evening and hope to meet you an other day here or in Alsace.



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