Irfp250n

tonistefanovski · 29th August 2005, 12:23 PM

Dear All,
Can I use IRFP250N instead of IRFP244 in Aleph 5 amp.???
Regards,

Kari · 29th August 2005, 02:02 PM

Yes you can. Try to find IRFP240 first and if you can't find that use the IRFP250.

/Kari

Magura · 29th August 2005, 02:09 PM

To use IRFP250 is not the best idea for any of the Pass constructions, due to the higher capacitance.

Go shopping online, and you will find that IRFP240's are available and perhaps even cheaper online than your local supplier.

Magura

Nelson Pass · 29th August 2005, 10:08 PM

Treat the 250 like it's two 244's in parallel on a chip.
Unfortunately it doesn't enjoy full dissipation of 2 X 244's, being
in one case, but it works otherwise.

Raoul · 30th August 2005, 11:47 AM

Quote:

PASS: Unfortunately it doesn't enjoy full dissipation of 2 X 244's

Time to water cool

MikeW · 30th August 2005, 12:42 PM

I have built Alephs with IRFP 140, 240, 244, 250, 254, and 260. Some mini-A variations with some Fairchild HUF and FQA mosfets. They all sounded good to me.

tonistefanovski · 30th August 2005, 01:24 PM

O.K. somebody says it’s not good, some says “yes you can use IRFP250N but…” ,and I don’t know what to do!!!
So if I use IRFP250N regarding IRFP244, should I expect bad sound, unstable amplifier,etc……. I know, mr.Pass saying that the better choice is not to be used IRFP250N but, I can’t find them here, or shops do not have on stock 30pcs, that is the real problem.
Regards,
Toni Stefanovski

N-Channel · 30th August 2005, 01:32 PM

If Nelson says that it's OK, then it's OK, and you can take that as Gospel. End of story!

mlloyd1 · 30th August 2005, 02:51 PM

Amen.

mlloyd1

Quote:

Originally posted by N-Channel
If Nelson says that it's OK, then it's OK, and you can take that as Gospel. End of story!

jh6you · 30th August 2005, 03:58 PM

My Pass F1 is with IRFP250N.
Technically, the high frequency roll-off could be faster because of its higher capacitance character. I however do not detect it when I listen to the music.

Aleph 2 uses 6xIRF244 in parallel.
Acc. to Nelson's small tip, it is equivalent to 3xIRFP250N in parallel with respect to the total capacitance.
Wow . . . a lot of bloody capacitance . . .
But, how many Aleph 2 owners complain its sound . . . ?

No time to talk too much. Just go ahead with IRFP250N.

Regards
jH

29th August 2005, 12:23 PM	#1
tonistefanovski diyAudio Member Join Date: Jun 2005 Location: Skopje,Macedonia	Irfp250n Dear All, Can I use IRFP250N instead of IRFP244 in Aleph 5 amp.??? Regards,

29th August 2005, 02:09 PM	#3
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	To use IRFP250 is not the best idea for any of the Pass constructions, due to the higher capacitance. Go shopping online, and you will find that IRFP240's are available and perhaps even cheaper online than your local supplier. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

30th August 2005, 12:42 PM	#6
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	I have built Alephs with IRFP 140, 240, 244, 250, 254, and 260. Some mini-A variations with some Fairchild HUF and FQA mosfets. They all sounded good to me. __________________ MikeW

30th August 2005, 01:24 PM	#7
tonistefanovski diyAudio Member Join Date: Jun 2005 Location: Skopje,Macedonia	Irfp250n O.K. somebody says it’s not good, some says “yes you can use IRFP250N but…” ,and I don’t know what to do!!! So if I use IRFP250N regarding IRFP244, should I expect bad sound, unstable amplifier,etc……. I know, mr.Pass saying that the better choice is not to be used IRFP250N but, I can’t find them here, or shops do not have on stock 30pcs, that is the real problem. Regards, Toni Stefanovski

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29th August 2005, 02:02 PM	#2
Kari diyAudio Member Join Date: Jan 2004 Location: Stockholm	Yes you can. Try to find IRFP240 first and if you can't find that use the IRFP250. /Kari

29th August 2005, 10:08 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Treat the 250 like it's two 244's in parallel on a chip. Unfortunately it doesn't enjoy full dissipation of 2 X 244's, being in one case, but it works otherwise.

30th August 2005, 01:32 PM	#8
N-Channel diyAudio Member Join Date: Mar 2003 Location: Sol System	If Nelson says that it's OK, then it's OK, and you can take that as Gospel. End of story!

30th August 2005, 03:58 PM	#10
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	My Pass F1 is with IRFP250N. Technically, the high frequency roll-off could be faster because of its higher capacitance character. I however do not detect it when I listen to the music. Aleph 2 uses 6xIRF244 in parallel. Acc. to Nelson's small tip, it is equivalent to 3xIRFP250N in parallel with respect to the total capacitance. Wow . . . a lot of bloody capacitance . . . But, how many Aleph 2 owners complain its sound . . . ? No time to talk too much. Just go ahead with IRFP250N. Regards jH

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