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Old 30th September 2006, 02:25 PM   #1121
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Default irf to n or not to n

I am ready to purchase some IrfP044 Mosfets for the Aleph-x (low power ver). It seems there is a choice btween No N and N type with what seems to me to be a trade off between less capacitance with the N type but more thermal resistance. My feeling is as long as the device is heatsinked proprely It would be more advantages to take less capacitance. Any thoughts ?



J
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Old 30th September 2006, 04:38 PM   #1122
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Default Re: irf to n or not to n

Quote:
Originally posted by tenderland
My feeling is as long as the device is heatsinked proprely It would be more advantages to take less capacitance.



J

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Old 1st October 2006, 01:13 PM   #1123
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I thought the 240 were better...
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Old 3rd October 2006, 08:25 PM   #1124
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Old 29th October 2006, 09:15 PM   #1125
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Old 4th November 2006, 11:52 AM   #1126
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I wonder how to add a low-pass filter at the amp input (and output) so that HF noise doesn't get in (I'm in an interference-rich environment).
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Old 4th November 2006, 05:47 PM   #1127
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Do you hear HF noise? If so, how would you know its environmental?

/Hugo
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Old 5th November 2006, 02:06 AM   #1128
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It's there because an RF probe and a scope shows it.
I don't have to hear it directly to have concern about potential slewing distortion it can cause.
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Old 6th November 2006, 01:54 AM   #1129
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Nixie,

The Aleph-X design already has compensation caps on the feedback that create a low pass filter a little above 20kHz. That and the balanced operation more or less make HF noise a non-issue for these amps. I live at the bottom of Seymour Mountain where RF intensity is very high, and my Aleph-X's have no problems whatsoever with it.

Also, the 044 version is preferred for ower powered version as they don't eat up as much of the rail voltage compared to the 240's or 244's. The 044's sound ever so slightly darker, but still ever so resolved.

Cheers, Terry
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Old 20th November 2006, 03:09 PM   #1130
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Quote:
Originally posted by metalman
Nixie,

The Aleph-X design already has compensation caps on the feedback that create a low pass filter a little above 20kHz. That and the balanced operation more or less make HF noise a non-issue for these amps. I live at the bottom of Seymour Mountain where RF intensity is very high, and my Aleph-X's have no problems whatsoever with it.

Also, the 044 version is preferred for ower powered version as they don't eat up as much of the rail voltage compared to the 240's or 244's. The 044's sound ever so slightly darker, but still ever so resolved.

Cheers, Terry

Has anyone used IRF 144's? I used them in my Aleph30 with great success. Just wondering if anyone has experience using 144's with the HiFiZen boards from the GB a couple of years ago. How would the sound differ from the 044's or 240/244's for an under 40watt AlephX amp?

Thanks!

-David
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