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Old 8th August 2007, 11:24 PM   #11
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Default Re: IRFP044NPBF

Quote:
Originally posted by gregjpeters
....................

I'm hoping to use the IRFP044NPBF, but its PD is only 120W. Is that likely to be a problem? I notice the 244s originally used were only 125W, so I expect not? All the other substitutes seem to have 160-180W PDs. What do you suggest?
......................

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Originally posted by Nelson Pass


.......................
6) I'm sure they will all work. There are subtle differences, but
nothing to get excited about.

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Old 16th August 2007, 04:58 PM   #12
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Hi!

I'm interested in building an Aleph 3. I would like to have a taste of these famous Nelson Pass productions!
I read the owner’s manual but did not found any schematics… if I understood well, they were removed because of some men wearing suits!
It will be my first amp construction, thus I would greatly appreciate to have the layout too.

Many thanks,
Etienne
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Old 16th August 2007, 07:28 PM   #13
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Old 17th August 2007, 07:15 AM   #14
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I’m impressed, the great Nelson himself!
Thank you very very much!
It is incredible how available you are for the DIY community… I really appreciate.
The Aleph 3 will be my winter project (winters are long and dark here…). Now I will just have to gather some components.

Cheers,
Etienne
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Old 28th August 2007, 01:48 PM   #15
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Hello!
I have got a question about that 220uF caps in Aleph 3, What firm,brand are that caps in original Pass Aleph 3?
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Old 28th August 2007, 02:50 PM   #16
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Hello again, I got one more question:
Could anyone give me a parts list of Aleph 3 , with all resistors values and so on. Because I 'm a little bit confused, I searched the internet and I found different parts in many DIY projects. Really thanks for help
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Old 28th August 2007, 05:02 PM   #17
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Quote:
Originally posted by NeC
Hello again, I got one more question:
Could anyone give me a parts list of Aleph 3 , with all resistors values and so on. Because I 'm a little bit confused, I searched the internet and I found different parts in many DIY projects. Really thanks for help


look few posts up


http://tiny.pl/52c4
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Old 29th March 2008, 02:05 AM   #18
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Default Aleph 3 with non differential input?

Hello all,

I'm interested in making an aleph 3 without a differential pair at the input (using just one p channel input fet).

I'm wondering what circuit modifications will be needed. I know I'll need to alter the resistor/diode values for the differential pair's current source so it provides half the current, but what else? What about the feedback circuit? Is this a trivial exercise or too much bother?

Your advice is appreciated.

Cheers,

Greg.
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Old 29th March 2008, 02:39 AM   #19
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Default Re: Aleph 3 with non differential input?

Quote:
Originally posted by gregjpeters
Hello all,

I'm interested in making an aleph 3 without a differential pair at the input (using just one p channel input fet).
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Old 29th March 2008, 02:45 AM   #20
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The current source will have to go. You'll need to use a resistor instead. If you use a current source, the Source will bounce around and nothing will happen. The reason it works with a differential is because the differential sums to DC at the node between the two Sources.
Feedback will have to be rerouted to the input device's Source to preserve the proper phase.

Grey
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