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Old 26th August 2003, 05:34 PM   #1
diyAudio Member
Join Date: Aug 2002
Location: Toronto, Canada
Question Aleph30 with IRFP044's: Bad Idea?

Hi all,

I'm planning to build an Aleph30 and I happen to have a number
of IRFP044's on hand.

The rails of the A30 are at +/-25V. Given the drain-to-source
breakdown voltage of only 60V for the IRFP044's, I suspect they
may not be suitable.

Should I give the 044's a try or would that be flirting with
disaster? Or perhaps I should just get some IRFP240's?

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Old 26th August 2003, 06:43 PM   #2
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Join Date: Sep 2002
Location: near Milano , Italy
I'd rather try a Aleph-X, which has lower rails for a given power and is claimed by someone to be even better than the regular Alephs.

I'll try it myself and then will compare with my Aleph 30.


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Old 26th August 2003, 08:24 PM   #3
The one and only
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Join Date: Mar 2001
I believe 044's will work just fine. Might have to adjust
any Drain-Gate compensation.
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Old 26th August 2003, 11:13 PM   #4
wijgers is offline wijgers  Netherlands
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Join Date: Aug 2003
Location: Near Rotterdam
Question IRF244

Where to find them?????

Hi, Im a Newbe in making Amplifiers, but after some reading of several threads it came a bit clear to me. How the circuits are working and what everything stands for.
I want to upgrade my system (Commercial NAD 317 integrated amp, NAD 514 CD, Dali 505 Speakers, in which the filter allready had ben changed)
Amp has an extra set of Pre out.

I was thinking about A 30-40 Watt Amp. Don't need that much and planning to get rid of the amp by making an BOSOZ.

So me eyes felt on the Aleph3 / 30(thanks to MR Pass). and the A40. First I will try to make the Aleph. If that works, make it a continued story.

But in a store Near Rotterdam (dordrecht) Ther where no IRF 244. :bawling

Does anybody in the Netherlands where to buy the Matched IRF244, or are there substututes without makking any changings off bias and current gain?

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Old 27th August 2003, 02:27 AM   #5
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Location: Toronto, Canada
Thanks for the advice! Will give the 044's a try.

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Old 27th August 2003, 05:48 AM   #6
Netlist is offline Netlist  Belgium
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Join Date: Jan 2003
Default Re: IRF244

Originally posted by wijgers
Where to find them?????
The IRF244 is obsolete.
You could try IRFP244.
It has about the same specs as the IRF244.
Ooh, and welcome to the forum.

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Old 27th August 2003, 08:00 AM   #7
edm is offline edm  Netherlands
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Join Date: Nov 2002
Location: The top of the Netherlands
Go here:

Most of the people there also post here, so perhaps they answer here.
(see e.g. What?... Another Aleph 5? or Another Aleph-X coming up!) Perhaps you could also try to contact them through this forum.
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