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Old 1st July 2012, 12:11 PM   #11
flg is offline flg  United States
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I wonder why the omission of the Rsource for Q1? Unusuall to not see a .47 ohm there?
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Old 1st July 2012, 01:02 PM   #12
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I don't think this circuit will work the way it is.
Isn't Vgs of Q1 at 0V?
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Old 1st July 2012, 01:32 PM   #13
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It pays to read the article a few times.

From the article:
"The above circuit does not yet make allowance for providing the correct DC voltage on the Gate pin of Q1 so as to conduct electricity."
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Old 1st July 2012, 01:41 PM   #14
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I wonder why the omission of the Rsource for Q1? Unusuall to not see a .47 ohm there?
Clearly a question to Mr. Pass.
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Old 1st July 2012, 01:49 PM   #15
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I wonder why the omission of the Rsource for Q1? Unusuall to not see a .47 ohm there?
Would increase available gain as well as output impedance. Using more linear parts like SiT or SiC, may be unnecessary. Looking at the Sit 1, I believe you will see that lack of Rs. Nelson also spoke of new cascode degeneration. This could perhaps give him the loadline cancellation using SiT devices without the need for Rs, sort of like F3 trick. Just guessing, though.
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Old 1st July 2012, 03:29 PM   #16
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interesting, is this CCS will work with the 2SK82 also ?
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Old 1st July 2012, 03:42 PM   #17
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why not?
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Old 1st July 2012, 04:06 PM   #18
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So pretty much a total newb here. But I did get to go to this camp, and had an amazing time. I learned a ton about introductory electronics etc, how this amp works and why, and some basic sound theory, most of this you guys all know like the back of your hand. But as my first real musical electronics project this was an amazing time, with amazing people, and coming out of it with 2 amazing amps is just straight exhilarating.

So now, Im trying to figure out how to pair speakers to this (again total beginner). Jason was saying something about this ends up being a 5 watt class a power amp, which requires high sensitivity speakers (95db+). But I'm not exactly sure what this means or how to find a good match. Any advice, or questions about the camp and my experience there?
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Old 1st July 2012, 04:28 PM   #19
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This sounds like a fantastic project to do, wish I could have been there!
Maybe I should do one in Europe...

jan didden
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Old 1st July 2012, 04:37 PM   #20
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do i see a nice little bedroom amp?
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