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Old 29th August 2005, 12:23 PM   #1
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Default Irfp250n

Dear All,
Can I use IRFP250N instead of IRFP244 in Aleph 5 amp.???
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Old 29th August 2005, 02:02 PM   #2
Kari is offline Kari  Sweden
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Yes you can. Try to find IRFP240 first and if you can't find that use the IRFP250.

/Kari
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Old 29th August 2005, 02:09 PM   #3
Magura is offline Magura  Denmark
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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.

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Old 29th August 2005, 10:08 PM   #4
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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.
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Old 30th August 2005, 11:47 AM   #5
Raoul is offline Raoul  United States
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Quote:
PASS: Unfortunately it doesn't enjoy full dissipation of 2 X 244's
Time to water cool
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Old 30th August 2005, 12:42 PM   #6
MikeW is offline MikeW  United States
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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.
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Old 30th August 2005, 01:24 PM   #7
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Default 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.
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Toni Stefanovski
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Old 30th August 2005, 01:32 PM   #8
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If Nelson says that it's OK, then it's OK, and you can take that as Gospel. End of story!
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Old 30th August 2005, 02:51 PM   #9
mlloyd1 is offline mlloyd1  United States
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Amen.


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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!
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Old 30th August 2005, 03:58 PM   #10
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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.

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jH
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