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Old 7th June 2020, 12:57 AM   #2751
Eric is offline Eric  United States
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Aleph-X builder's thread.
tomchaoda1: see my Aleph-X page in my signature. The original wiki is there in pdf format. My web page was forced to a new server about a year ago and I haven't had the time to get everything back up, but most of the content is still there.

grataku: It's been a long time - still enjoying those amps that you helped share with the world all of those years ago. I think Grey Rollins was one of the key contributors to the circuit design. He hasn't been around here in quite some time. I think he tired of the trolls at the time.
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Old 7th June 2020, 01:03 AM   #2752
Eric is offline Eric  United States
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Aleph-X builder's thread.
hmmm... The wiki link on my page is broken. Here is the document you are looking for.
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File Type: pdf Aleph-X_Wiki.pdf (67.0 KB, 38 views)
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Old 8th June 2020, 01:15 PM   #2753
grataku is offline grataku  United States
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Thanks for the pdf Eric! You did a fantastic job on your site putting together all the information about the amp. As important as the boards themselves for the idea to be kept alive. My job forced me to move on from DIYing I sold all my instrumentation when I relocated but I continue to listen to the music.
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Old 8th June 2020, 02:10 PM   #2754
Eric is offline Eric  United States
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Aleph-X builder's thread.
grataku: my web page was more useful before I had to move it. It still has a few broken links and some of the images in the later half still need to be replaced with larger, more detailed images.

tomchaoda1: for your "cold side" of the amp, I would suggest tweaking your bias pots a little while you have a meter on the source resistors for the mosfets. See what you are getting for bias. Fully biased up, you should be somewhere near the 0.4v range I think. Maybe one of your pots just corroded/oxidized a bit over time. Since the layout of the board is highly symmetric, it should be easy to compare voltages from one side of the amp to the other. Start with bias for the input differential, then bias on the output transistors. Then move on to other parts of the circuit. This should be pretty easy to track down, it will just be tedious.
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