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Old 12th January 2001, 03:35 PM   #21
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Red face A-40 Transistors

Dok, I couldn't find the issue with reference to the A-40 output trans. I must have seen them in an issue that I don't have at the magazine stand. I only have #1,3,5. I'm missing 2,4 & 6 for 2000. Sorry about that. I though I had it.
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Old 14th January 2001, 12:30 AM   #22
Asen is offline Asen  Bulgaria
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Default Aleph 3 with mods

Hi Aleph fans!

There is a little modified Aleph 3 with balanced input. Check this adress:
http://www.volksamp.com

About the Hexfets - what do you think about IRF450? Are these suitable for the Aleph?
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Old 14th January 2001, 01:56 PM   #23
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Question Aleph 4

Can Aleph 4 drive the 4ohm load?
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Old 14th January 2001, 06:31 PM   #24
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Itīs not hard to modify the input to use balanced input itīs the same as the other amps, they have exactly the same schematic.
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Old 15th January 2001, 04:50 PM   #25
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Default Aleph Project & Volkamp


I emailed Volkamp several months ago on the prices of their amps. A reproduction of the Zen goes for about $1800. The Alephs are more. I built my Zen w/out enclosure for about $175.

Use Hexfets with the lowest voltage the circuit will allow safely. It's suppose to lower distortion figures.
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Old 15th January 2001, 05:04 PM   #26
Eric is offline Eric  United States
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Default commercial vs. DIY pricing

So, it appears that the 10:1 ratio of commerical cost vs. DIY cost holds up once again!!

I first heard about this with respect to speakers and was horrified to learn that the $1000 I spent on a pair of speakers bought me approximately $75-100 worth of drivers and crossovers!

Nothing but DIY for me from then on!
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Old 15th January 2001, 06:06 PM   #27
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Talking Comm. vs DIY!

That's why I spend so much time on this awesome site!!!
Excellent returns!
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Old 15th January 2001, 06:15 PM   #28
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The lower the max. voltage the higher the max. current of an HEXFET and smaller the distortion of the amp.
Some comercial products are worth their money but some times itīs a clear ripoff.
I am taking a look at the Volksamps they donīt "look" so cool as the Pass ones but they do the same thing.
I still canīt decide what to do about the PCB.
This will probably take me a long time to finish.
So little time for so much to do . hahaha !
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Old 18th January 2001, 07:21 PM   #29
Asen is offline Asen  Bulgaria
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Default Hoffmann Amp

I have the schematic of Reinhard Hoffmann's class A power follower with dynamic current source. (I was told this is not the project published in AudioXpress).
If you're interested, feel free to contact me. mail: tutekov@hotmail.com
Or contact Mr. Hoffmann himself:
Reinhard Hoffmann
Wiembecker Str.1
32657 Lemgo / Germany
Fax & Fon 05261 87586

[Edited by Asen on 01-19-2001 at 05:19 PM]
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Old 21st January 2001, 07:28 AM   #30
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Thanks for the schematic you sent me. It looks very interesting. The active current source is a different idea.
After searching a lot of schematics from the Pass designs and others I think the aleph 3 is very simple. I am not sure if any further developing of the curcuit will do good or not for the sound quality.
Thanks again Asen.
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