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Mosfet mix on Aleph
Mosfet mix on Aleph
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Old 11th January 2002, 10:56 AM   #1
Ligado is offline Ligado
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Default Mosfet mix on Aleph

I have problem to obtain all irfp240 so I think if is possible put another type in the current source (i.e. irfp250). I have read on others threads that problem is input capacitance. This affect current source on Aleph?
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Old 11th January 2002, 05:33 PM   #2
hifi is offline hifi  Sweden
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They have double the capacitance i have once asked NP himself in an older thread they would certainly work but he did not know how the would sound...better? worse? ..the same?...just test them

;-)

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Old 11th January 2002, 07:21 PM   #3
Nelson Pass is offline Nelson Pass  United States
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Mosfet mix on Aleph
The 250's behave a lot like two 240's in parallel. They
work, and experience says that the bottom end improves,
but the top end gets a little darker. Not necessarily
objectionable. In my opinion it improves an Aleph 3 slightly,
does not work well in a 1.2.
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Old 11th January 2002, 09:31 PM   #4
hifi is offline hifi  Sweden
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okie... im sorry to have miss qouted you but i believe that you said you hadnt tested it...well it was quite a long time ago..


The 250 has a much higher capacitanc i guess that is what makes the sound darker and it not suitable for the 1,2 to high a capacitance..

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Old 12th January 2002, 11:30 PM   #5
Ligado is offline Ligado
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Thanks all! (specially Mr. Pass)

But my question is about to use IRFP240 in the path signal (Am I wrong?) and the IRFP250 in the current source.
(English isn't my native language)
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Old 14th January 2002, 07:09 PM   #6
Nelson Pass is offline Nelson Pass  United States
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Mosfet mix on Aleph
Sure, it'll work fine.

I did recently try the 250's, just to see, but I don't have
a compelling reason to go to them. I get more dissipation
capability off of 240's in parallel.
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Old 15th January 2002, 11:43 PM   #7
Ligado is offline Ligado
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Thank you Mr. Pass. I am finishing a copy of a kind of Aleph4. I expect you accept the pictures in your site's gallery.
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