flg said: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.
wuffwaff said:
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!
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....
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....
Zen Mod said: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/attachment.php?s=&postid=1094627&stamp=1167603488
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