Irfp250n

[tonistefanovski]

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

 

[Kari]

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

/Kari

 

[Magura]

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]

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]

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

Time to water cool

 

[MikeW]

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]

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]

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

 

[mlloyd1]

Amen.


mlloyd1

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

 

[jh6you]

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

 

[Nelson Pass]

You can always change them out later.