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Old 6th September 2011, 03:19 PM   #81
EUVL is offline EUVL  Europe
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> As the sim showed even variations of 5% in hfe didnīt increase THD considerably.

Unless we have made some very stupid mistakes.......

We have tried all combinations bu changing each of Q1 to Q4 by 5%. Irrespective of what Q2 & Q3 does, every time when we change Q4 by 5% and keep Q1 unchanged, or vice versa, we get THD 0.019%. I also find it difficult to understand, but I have no time to figure it out right now.


Patrick
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Old 6th September 2011, 05:45 PM   #82
Calvin is offline Calvin  Germany
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Hi,

for a higher precision of the THD analysis the command .plotwinsize=0 should be set.
This switches off the data compression feature of LTspice.
EUVLs sim missed on this command and I was able to verify his high THD-figures by removing this command from my simulation.
In #62 I included the LTspice file to verify or falsify the sims. As one can see, I used the same models and variations.
Funny thing... with the plowinsize command set and Q1 (or Q4 in EUVLs schematic) varyed, the THD-figures were the lowest of all transistor combinations (0.000314% -110dB).

jauu
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Last edited by Calvin; 6th September 2011 at 05:47 PM.
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Old 6th September 2011, 06:30 PM   #83
EUVL is offline EUVL  Europe
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You are right with Spice. We can confirmed that.
So at least we have resolved that difference.




Patrick
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Old 7th September 2011, 07:38 AM   #84
Calvin is offline Calvin  Germany
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Hi,

what differences? We were pleasantly discussing alternatives, werenīt we?
Now only the Tube-fraction is missing on their SEN-version here

jauu
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Old 7th September 2011, 08:49 AM   #85
EUVL is offline EUVL  Europe
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I have 2 PCBs of Sen & Cen to spare.
If you promise to build and compare with your BJT version, I'll send you for free.

Interested ?

We shall do some more work on Joachim's, based on 4-BJT Wilson Mirrors.
Both in Sim and in hardware.


Schoenen Gruss,
Patrick
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Old 7th September 2011, 11:03 AM   #86
Calvin is offline Calvin  Germany
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Hi,

EUVL...got Milk?.... ahem got PM

jauu
Calvin
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Old 7th September 2011, 12:18 PM   #87
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I am planing to build my version this week. I can configure it as an I/V stage first.
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Old 7th September 2011, 01:09 PM   #88
EUVL is offline EUVL  Europe
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We can send them all to Jan Didden for audition.....




Patrick
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Old 7th September 2011, 01:52 PM   #89
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Quote:
Originally Posted by EUVL View Post
We can send them all to Jan Didden for audition.....




Patrick
I have an even better idea. I will be at Stuarts' house with a few more very critical and accomplished listeners mid-October. We can do an informal (or even formal) listening session then. If Stuart has time, of course. Never know with those VP's

jan
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Old 7th September 2011, 01:52 PM   #90
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I do not plan to go into competition. Patrick, your design is simple, elegant and efficient.
A shoot out at Janīs place would be fun though if he agrees.
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