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Old 6th April 2013, 10:20 AM   #1821
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they are *beautiful*
All IME, IMO and IMU of course
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Old 6th April 2013, 11:40 AM   #1822
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Location: Warwickshire
Default A40 weight

Originally Posted by zeonrider View Post
Weight per amp?

Regards zeoN_Rider
Just weighed the amps and the are just under 2 stone, almost 28 pounds each.
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Old 6th April 2013, 12:04 PM   #1823
Join Date: Dec 2007
Originally Posted by Blink_PT View Post
Of the many experiences I had with fans, this is the one that gives better results.

A rear blower 80 to draw air, and two fans 92 to provide air channels to the pcbs.

Fans DBs are low, 10 and 17dBs.

One thing I discovered, if you connect a sensor F5T temps and only when it is hot it turns the fans, takes a long time to cool down.

I removed the sensor, when I turn the F5T the fans start to spin, then the temps will keep a long time with very reasonable temperatures.
Looking At It : Why one wuld want air currents inside the case and get offsets going bananas ?

Why not 2 groups 4 small fans 30 or 40 mm diameter fitted outside just under or abowe the heat sink fins?
Litle fans used as PC memory coolers will fit nicely and 4 in series on each bank can be powered by suply rails at 1/2 nominal voltagge and be prety silent + eficency of sinks is going way way up.

You end up taking heath out of a much larger surface area instead of cooling down what look like a brick.

And you can use litle spare F5 thermistor and a pot to make potential devider to feed gate voltagge to spare F5 mosfet as temperature go up fans spin faster this way your amp get to working temperature prety quick and stay there both in Winter and Summer.
You got spare bit in the part box neh?

Last edited by Bksabath; 6th April 2013 at 12:18 PM.
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Old 12th April 2013, 01:52 PM   #1824
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Join Date: Nov 2011
Location: beautiful Oberpfalz Bavaria
Finally ist done my Aleph P Clone has moved into a new enclosure.

I`ve used a LSQR3 for Volume Control & Input selection.
Layouts for board are from RSTaudio

Sounds fine & replaces my B1 Clone
For driving a F5 Clone i think its a better decision.

Now B1 is Pre for a SYMASYM

Many thanks to GENERIC and ZEN MOD who helped me with a little
hum troubleshooting
(now i use 221Ohm resitors at input so souce can`t look directly at the zeners at the input what removed hum complete.
I had the same problem with the Bosoz when let the 221Ohm resitor out at input

I only wondering how this is solved at orgin Aleph P

....hmm ...who knows maybe ? for me problem is solved)

Many thanks to Mr. Pass for publishing this circut.
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Old 13th April 2013, 12:38 PM   #1825
n3szd is offline n3szd  United States
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Old 13th April 2013, 03:03 PM   #1826
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Location: Budapest
Very nice, just not children compatible, like my Mezmerize robot
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Old 13th April 2013, 03:12 PM   #1827
n3szd is offline n3szd  United States
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Originally Posted by rookakoma View Post
Very nice, just not children compatible, like my Mezmerize robot
Mine arent either, I cant see straight 6500 watts does it to you, my house can't handle it. Nice work... aleph3 dc turbo yeah baby!!!! I really hope it can be done...
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Old 13th April 2013, 03:47 PM   #1828
n3szd is offline n3szd  United States
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Thank you, compliments are always welcome, I hope to take this to the next level.. No kids no cats...
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Old 13th April 2013, 06:13 PM   #1829
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Location: Best Coast
That's beautiful casing, evanc. Wow. I bet it sounds as well as it works.
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Old 13th April 2013, 08:56 PM   #1830
WalterW is offline WalterW  Netherlands
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Join Date: Oct 2012
Location: Utrecht
Originally Posted by Earthloop View Post
At last the A40s are finished! The sound from these is EPIC, simply stunning. Huge soundstage, super sweet treble and pile driver bass with superb grip and control (no doubt aided by the use of a 500VA toroid with 44,000uF per channel). If anything these are a perfect lesson in how power ratings can be misleading; the power amp they replace is rated at 100 watts per channel (an Audiolab 8000P which is very nearly 26 years old) and these monoblocks just blow it into the weeds. I was wondering, when I was building them, if there would be enough power for my KEF Q7s!
I have not driven the amps to clipping because the Q7s sound like they might burst and also my ears wouldnít stand any more volume. What is also amazing is how effortless and relaxed the sound remains at this volume. Another plus point is that the sound is every bit as good at very low volumes too. All in all I am absolutely gobsmacked by the magnitude of the improvement over my old amp (the KEFs sound amazing when driven properly with a quality signal) and Iím still using the Audiolab preamp (8000C) with the A40s, but not for long because Iíve just received a B1 buffer preamp PCB with matched JFETS from Pass Diy.

Eric, thanks for your comments after my previous post, I really enjoyed reading your website.


Respect! For drilling all those holes 224 times :-)

Pass F5, F5Tv3, ACA, Aleph J, DDDAC1794, DCB1, BA3-preamp, VFET CSX1, Pass F6
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