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Old 26th January 2012, 01:43 PM   #111
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Do have a read of this guys experience.

http://www.parttimeprojects.com/audio/diy/F5.php
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Old 26th January 2012, 01:45 PM   #112
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I guess the bottom line is not too encouraging...
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Old 26th January 2012, 01:54 PM   #113
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If you listen at LOW VOLUME and have VERY EFFICIENT speakers then the reviews are VERY encouraging.

If you listen at HIGH VOLUME and your speakers are VERY INEFFICIENT then the reviews are less encouraging.

There are a lot of VERY impressed builders out there. What they are comparing their builds to is unknown.

I compare my Aleph 4 to my Highly Modified Arcam AVR350. PRAISE Nelson Pass, the Aleph 4 is ABSOLUTELY STUNNING compared to the "run-of-the-mill" sound from the Arcam.

Pass do make BEAUTIFUL sounding amplifiers.

In High-End Hi-Fi you often start to have to match the components together. Is it this level that you can start to hear the differences between interconnects that the fanatics are talking about.
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Old 26th January 2012, 02:01 PM   #114
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Quote:
Originally Posted by KatieandDad View Post
Do have a read of this guys experience.

http://www.parttimeprojects.com/audio/diy/F5.php
I get your point. I feel Alpeh4 is little too much for my place. It will turn out be a furnace generating about 600 to 800 watts of heat continously.

My place has 9 months of summer to 3 months of winter. Is there any other design which will get me 50 W class A.

Thanks
Pandu
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Old 26th January 2012, 02:06 PM   #115
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The Aleph 4 pumps out about 400 W of heat. Mine actually measures 350W in its bi-mono version.

I've calculated my heatsinks to run at 45 Degrees during the winter months. During the summer they run at closer to 60 Degrees.

I believe that the production version runs between 80 and 85 Degrees C.

Hopefully my caps will last a bit longer than a production version.

In high ambient temperatures you may have to consider adding fans. they can be relatively quiet if run at lower voltages than they are rated at - you can always be clever and feed the fans from a temperature controller.
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Old 26th January 2012, 02:10 PM   #116
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Be warned - the DIY bug is a dangerous beast. Once it bites you may never be cured.

If you prepare yourself for the worst you will be WELL prepared.
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Old 26th January 2012, 02:12 PM   #117
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Originally Posted by pdhanwada View Post
I get your point. I feel Alpeh4 is little too much for my place. It will turn out be a furnace generating about 600 to 800 watts of heat continously.

My place has 9 months of summer to 3 months of winter. Is there any other design which will get me 50 W class A.

Thanks
Pandu

Please don't get blinded by the fact that my speakers are horribly INEFFICIENT and are POWER HUNGRY. They also drop to less than 2 Ohms as a load - hence the 6 x MOS-FETs (12 if you count the current sources) in each output stage of the Aleph suit them down to the ground.

Last edited by KatieandDad; 26th January 2012 at 02:15 PM.
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Old 26th January 2012, 02:12 PM   #118
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Are you ALWAYS that encouraging?
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Old 26th January 2012, 02:24 PM   #119
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If you heed my advice at Post #109 I would certainly try the F5.

I would SERIOUSLY recommend the Pass amps, they are all STUNNING.
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Old 26th January 2012, 02:29 PM   #120
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Have a look at http:\\www.kk-pcb.com

Although his PCBs don't get good press, you can see some of the other Pass DIY amplifiers that are available to build.

Then just do a search for each amp on Google to see if anyone has posted a build and their experiences.

The Pass amps are beautiful in their simplicity and Nelson supports each and every build (I hope).

There is a Pass amplifier for everybody.

The Aleph 5 is a scaled down version of the Aleph 4. (Not sure of the exact maths but it looks about 75W RMS) and there is the Aleph 3 which is scaled down even further.

The beauty of these designs is that they (largely) share the same drive electronics (with minor modifications)

Last edited by KatieandDad; 26th January 2012 at 02:33 PM.
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