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Old 16th September 2012, 06:15 PM   #11
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Sorry to say this Madtecchy, with these "discrepancies" this amplifier will simply not work.

BTW Dave Zan, KRELL was pretty successful using the complimentary symmetry topology in their amps. Dan Augustino obviously did not pay attention to what Bob said.
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Old 16th September 2012, 06:57 PM   #12
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Default Discrepencies

As Jason has already pointed out for Q8, I think Q8 and Q7 should be npn's with e-c reversed.
Similarly C3 appears to have the wrong polarity shown.

I do wonder if the big difference between the degeneration resistors R7, R12 (1K, 100 ohms respectively) is a typo or an intentional way to try and set the vas idle current?

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-Antonio
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Old 17th September 2012, 01:18 PM   #13
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Quote:
Originally Posted by magnoman View Post
I do wonder if the big difference between the degeneration resistors R7, R12 (1K, 100 ohms respectively) is a typo or an intentional way to try and set the vas idle current?
Hi Antonio
All the errors look like the schematic has been derived from a sample so I would expect someone misread a resistor multiplier band. Makes no sense as an intentional difference.

Best wishes
David

BTW Nico, it is "complementary" and I rather like them, hence my list of benefits. But best to inform the OP of the other opinion too.

Last edited by Dave Zan; 17th September 2012 at 01:28 PM. Reason: Added BTW
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Old 17th September 2012, 01:30 PM   #14
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David

Your right, thought about it some more and came to the same conclusion.

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-antonio
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Old 17th September 2012, 07:03 PM   #15
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I was only joking Dave Zan.
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Old 18th September 2012, 02:11 AM   #16
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Quote:
Originally Posted by Nico Ras View Post
I was only joking Dave Zan.
You appear to have forgotten to use the humour / sarcasm font .
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Old 18th September 2012, 05:26 AM   #17
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Hi all..

My oh my . i could see you all getting in a tiz about the scem being wrong . nico i agree that the amplifier will not work . I have also noticed the componet location numbers are totally diffrent to the ones used in the actual amplifier . Apart from that it is the right scematic . will see if i can redraw the scem in eagle using the amp i have to check the componet valuse .. Ps this amp sounds quite nice !
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Old 18th September 2012, 07:10 AM   #18
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Originally Posted by Nico Ras View Post
KRELL was pretty successful... Dan ... did not pay attention to what Bob said.
Bob is not a real fan but does actually write that "many fine amps have been made" with complementary symmetry, so the comment doesn't have much bite as a joke. You haven't read the book I think? But no problem, I've had a little discussion with him about symmetry in circuits and he's not doctrinaire about it. So I will take this as a chance to recommend his book to the OP and anyone else who hasn't read it, to learn some of the subtleties in the subject.

Best wishes
David

Last edited by Dave Zan; 18th September 2012 at 07:17 AM.
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Old 18th September 2012, 03:31 PM   #19
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Originally Posted by jkuetemann View Post
You appear to have forgotten to use the humour / sarcasm font .
For some reason when I quick reply the smilies do not attach, only when I do advanced. Sorry
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Old 18th September 2012, 05:00 PM   #20
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so please tell me .. How come you are both so hung up on emoticons ???.
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