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21st August 2002, 03:28 PM
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#1 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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Improving current source for Aleph
I just started modifying one of my A75 into Aleph 2 today.
 Since it's A75 I have available 50V regulated power supply for the input stage. I was thinking about using it for differencial pair current source and somehow improving it as well. Any suggestions? Any improvements when current increased? What would be recommended value then? The drain resistors (392 ohm) would be connected to output stage supply.
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www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC |
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21st August 2002, 03:59 PM
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#2 |
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diyAudio Member
Join Date: Sep 2001
Location: LA County
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http://diyaudio.com/forums/showthread.php?threadid=5380
May be you two should combine the two thread and cook up something .... |
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21st August 2002, 05:34 PM
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#3 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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He's talking about output current sources and I'm talking about input.
It's a shame that something so nice has to be dismantled, but some people do anything for better sound. This might well be the first DIY Aleph with TO3 output devices. I'm also playing with idea of turning it into Aleph X instead of Aleph2, don't know yet.I like the way the transformer is isolated from the rest of the circuitry. I also used special damping materal for vibration reducing. Also I used Panasonic HFQ capasitors for PS (quite a lot of them).
__________________
www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC |
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21st August 2002, 05:38 PM
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#4 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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It's been my best work so far and it looks like it still remains with an upgraded interior.
Checking other threads I noticed that Harry placed 5 green LEDs instead of zener with a small bypass cap. Is that the best that can be done? The heat sink are removed. This allows for easy access in case of repair, modification. As you see mounting TO3 devices is not as easy as those plastic ones and special bars had to be used.
__________________
www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC |
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21st August 2002, 06:07 PM
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#5 |
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diyAudio Member
Join Date: Jun 2002
Location: Italy
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It has something as a coffee machine !
Very big, and what a good job! |
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21st August 2002, 06:18 PM
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#7 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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That's the detail of AC connection circuit. I got special circuit from ML 23.5 which supposedly removes DC component from AC. I'm using triak for switching and some people expressed concern it might introduce some noise. Is it true?
__________________
www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC |
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21st August 2002, 06:20 PM
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#8 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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That's the way front end board is mounted. The input jacks are directly connected from the other side.
I wonder how it all gonna look when I start my p2p, in those days I was firm believer that PCBs are better.
__________________
www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC |
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21st August 2002, 08:52 PM
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#9 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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And now everything is apart. Time to do some mods.
I only hope that my questions in the beginning is still drawing attention.
__________________
www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC |
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21st August 2002, 09:22 PM
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#10 |
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Banned
Join Date: Feb 2002
Location: Dallas,Texas
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Is that the best that can be done?
No......... By the way do not power the front end current source from a seperate supply from the output stage or you can end up with the turn on/off thump from hell if the supplies come up or down at different rates!
H.H. |
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