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Aleph-X monoblocks finished.
Aleph-X monoblocks finished.
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Old 21st January 2007, 10:53 PM   #141
flg is offline flg  United States
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I agree, the McMillans nay not be the culpret, but their solder joint could be? It seems it's a component that destroys cmrr???
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Old 22nd January 2007, 04:49 AM   #142
1001meier is offline 1001meier  Switzerland
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Quote:
Originally posted by flg
I don't see the McMillan R's in that schemo???
2.2K would possibly be the value??? Post #134???

But, then again, those R19-29 guy's???
You aren't running a single ended input are you???
McMillans are installed, so the schematic is slightly different from the original circuit I showed in previous post. First, I resoldered the parts around the CCS but this did not solve the problem. Next, I'll try installing C102 C105. I will post the results later.
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Old 22nd January 2007, 04:02 PM   #143
wuffwaff is offline wuffwaff  Netherlands
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Hi,

yes C102 is the one I meant. Donīt forget there are two of them......
Start with something small like 1n or 1n5.

William
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Old 22nd January 2007, 08:11 PM   #144
1001meier is offline 1001meier  Switzerland
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Quote:
Originally posted by wuffwaff
Hi,
yes C102 is the one I meant. Donīt forget there are two of them......
Start with something small like 1n or 1n5.

William
Here comes a short update of my ongoing chase for the hum in my aleph-x:

1) I inserted C102 and C105 as recommended, but used 10nF instead of the recommended 1nf, since 10nF was the smallest value I had on hand-> no change, same amount of hum

2) Replaced Q3& Q4-> no change, same amount of hum

3) Resoldered all small components around Q3-> around 40% reduction in hum judged by measuring output with scope, amplitude of oscillation is now around 10mV

I also noticed that hum level goes down as amplifier warms up.
Good news is I REALLY like the sound of my aleph-xs the longer I am listening!
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Old 22nd January 2007, 08:19 PM   #145
wuffwaff is offline wuffwaff  Netherlands
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Hi,

thatīs good news. So I would clean the circuit board and do some more soldering, then clean it again.

William

P.S. donīt forget to remove the caps if they are not necessary!
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Old 6th February 2007, 06:27 PM   #146
1001meier is offline 1001meier  Switzerland
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Default brif update on my chase of the hum

Hi All,

in my attempts to chase the hum out of one of my monoblocks I think I solved the problem- kind of.
After all my fruitless attempts I finally turned my attention to the input section and I exchanged the LTPs (Q5&Q7). The result is a reduction of the hum to a very low level. On my 96 db efficient speakers you can only hear it within 1m from the speaker. Funny thing is when I look at the output with my scope, I now see almost the identical amount of hum on both sides, i.e. the - side that had before been absolutley silent now has the same amount of noise as the + side. (both sides now look like the lower trace in the picture of my post #123). I guess the result is that the X-configuration now rejects the common noise quite efficiently....
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Old 30th August 2008, 04:24 AM   #147
lineup is offline lineup  Sweden
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Quote:
Originally posted by Zen Mod
locall time - 2320
this is Zen :
(again-be happy ,all of you )
how cute, Zen Mod
looks like a father and child image
http://www.diyaudio.com/forums/attac...amp=1167603488
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Old 3rd September 2008, 03:41 AM   #148
jpc6204 is offline jpc6204  United States
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The beauty of symmetry!
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Old 15th September 2015, 08:35 PM   #149
reggieSf25 is offline reggieSf25  United States
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Where did you source the heat sinks?
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Old 20th September 2015, 02:15 AM   #150
reggieSf25 is offline reggieSf25  United States
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man, they are beautiful
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