Not that my Aleph-5 isn't good, but rather this is my passion to make is better if I could! In this, I learn a lot and enjoy my learning all the way....
My passions:
1. My Aleph-5, after about an hour, settles its DC offset at 56mv and 48mv. I saw some DIY has rather good at 10mv. What's the trick (parts? circuit mod?) to make it that good?
2. Is there a way to increase the bass to Aleph-5 (and the Aleph-2 I am about to make)?
Again, many thanks to all who replies!
Thomas
My passions:
1. My Aleph-5, after about an hour, settles its DC offset at 56mv and 48mv. I saw some DIY has rather good at 10mv. What's the trick (parts? circuit mod?) to make it that good?
2. Is there a way to increase the bass to Aleph-5 (and the Aleph-2 I am about to make)?
Again, many thanks to all who replies!
Thomas
1 You can adjust the value of the 392 ohm resistor that comes
off the Drain of Q1.
2 Actually, the 5 tends to have a little more apparent bass
because of a little less bias and a little more current source
gain in ratio to the other models. If you up the bias and lower
the current source gain a bit, it starts to lean out, more like
an Aleph 2, which I happen to prefer.
In any case, playing with these two parameters will give you
a slightly different bass characteristic, and I would encourage
you to try it out. 😎
off the Drain of Q1.
2 Actually, the 5 tends to have a little more apparent bass
because of a little less bias and a little more current source
gain in ratio to the other models. If you up the bias and lower
the current source gain a bit, it starts to lean out, more like
an Aleph 2, which I happen to prefer.
In any case, playing with these two parameters will give you
a slightly different bass characteristic, and I would encourage
you to try it out. 😎
In testing and monitoring my newly made Aleph-5, all 3 sets of my IRFP240's bias voltage are in the range of 0.5V. However, one set is one at 0.6V and the other two is at 0.5V. Should I worry about this or not? (these MOSFET are matched to 0.01v and on the last set, they have the exact number) or should I change it?
Thanks,
Thomas
Thanks,
Thomas
You might find the following thread an interesting read.
Top ten ways to a better Aleph?
Regards,
Dan
Top ten ways to a better Aleph?
Regards,
Dan
Aleph-5
Yes, I did follow this thread and add a Wima 1uf MKP cap to the Z5 and the treble did sounds better.
What I am not sure is in one of my output board, I have this bias:
1st mosfet: 0.6 v
2nd mosfet: 0.5 v
3rd mosfet: 0.5 v
All other 3 output boards are in the range of +/- 0.5 v. In your opinion, should I change the first mosfet, or I should be fine?
Thomas
Yes, I did follow this thread and add a Wima 1uf MKP cap to the Z5 and the treble did sounds better.
What I am not sure is in one of my output board, I have this bias:
1st mosfet: 0.6 v
2nd mosfet: 0.5 v
3rd mosfet: 0.5 v
All other 3 output boards are in the range of +/- 0.5 v. In your opinion, should I change the first mosfet, or I should be fine?
Thomas
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