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Doug Self Preamp from Linear Audio #5
Doug Self Preamp from Linear Audio #5
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Old 16th September 2021, 11:02 AM   #1831
glenv6 is offline glenv6  United States
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Doug Self Preamp from Linear Audio #5
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Originally Posted by Johnny Canuck View Post

Thanks glenv6 - that's a good selection. Question though, is there a reason to use 22 uF rather than 10uF, or did you just have this value in your parts box?
Correct, I had one in the parts bin and freecrowder had already proven that value to work…

Doug Self Preamp from Linear Audio #5
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Old 16th September 2021, 11:27 AM   #1832
glenv6 is offline glenv6  United States
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Doug Self Preamp from Linear Audio #5
Thanks again Carl for your designs. I modified your 1U design to better fit a 2U case (just my preference), but before I order a case, I decided to spend some quality time listening to it.

I really like this preamp! As I said in a previous post, this thing is quiet. And it sounds very good - the soundstage is the best of my three preamps. The other two are a vintage NAD 1600 I bought brand new decades ago, and the Wayne Coburn 2018 I built last year. The NAD is warm, transparent, and a little on the restrained side. The WC2018 is clear, clean and spectacularly detailed. This DS/CH preamp is somewhere between those two, but the soundstage really sets it apart. Instruments and vocals are suspended in specific separate locations across a wide stage. Music is well, musical and enjoyable. I have listened for hours without the magic of that soundstage wearing off.

So, I will be ordering a case and boxing this thing up ASAP. It will probably spend more time in my rack than the other two.

Thanks again Carl for making Doug’s excellent design a reality!
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Old 16th September 2021, 02:38 PM   #1833
Carl_Huff is offline Carl_Huff  United States
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Looks great Glenv6. Be sure to post PICs of what it looks like in it's new enclosure.
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Old 16th September 2021, 09:07 PM   #1834
glenv6 is offline glenv6  United States
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Doug Self Preamp from Linear Audio #5
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Originally Posted by Carl_Huff View Post
Looks great Glenv6. Be sure to post PICs of what it looks like in it's new enclosure.
I will Carl, thanks!

Glen
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Old Today, 05:07 PM   #1835
Cyberpup is offline Cyberpup  United States
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I would add a note of caution with respect to tantalum capacitors. Companies such as IBM and Hewlett Packard long ago prohibited their usage in designs. Their chemistry makes them prone to combustion, and tantalum is also considered a conflict mineral. As a design engineer, it was always possible to use ceramic or solid electrolyte capacitors in their place. Usage of tantalum polymer capacitors solves the ignition problem for low impedance power rail applications, and ceramic capacitors were generally recommended for regulator stability applications.
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