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Old 16th October 2012, 03:32 PM   #2411
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Quote:
Originally Posted by lhquam View Post
The SIT makes most sense in a non global-feedback design. I suspect that the F6 would not have the sound Pa was looking for with zero feedback.
lhquam: What is the probability that a bright Software Engineer can devise a DSP to imbibe any line-level audio signal with triode, SIT, H2 and H3 , Pass amp, etc characteristics? Why continue to depend on future power amps to achieve these properties which at times appear vague?

Last edited by Antoinel; 16th October 2012 at 03:46 PM.
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Old 16th October 2012, 04:10 PM   #2412
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Old 16th October 2012, 04:15 PM   #2413
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Quote:
Originally Posted by lhquam View Post
In post #2249 F6 Amplifier
For some reason, one channel is behaving as predicted by Spice, but the other channel is not behaving well. I have to carefully check the wiring and components. The R100s were fairly well matched, so I do not think their differences could explain the different THD spectra.
I am having the same issue with one channel of a (Mu Follower) amp with matched Semisouth R100.

In one channel I can adjust H2 vs. H3 to desired level by varying source resistors.
The other channel is totally off, also having high H4 distortion.

Could it be an issue with Gate Leakage of R100, as described by Nelson for the R085 in the 'SiC Puppy SE Amp" thread ?

Last edited by dsdjoy; 16th October 2012 at 04:21 PM.
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Old 16th October 2012, 04:17 PM   #2414
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naah ......
Did you see Fearless Felix drop 24 miles out of the sky? Incredible! Said who it could not be done? Where's Joachim Gerhardt to weigh in?

Last edited by Antoinel; 16th October 2012 at 04:20 PM.
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Old 16th October 2012, 04:19 PM   #2415
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Old 16th October 2012, 04:31 PM   #2416
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it can be , but it never will sound as KISS
I agree. KISS will be the industry standard against which these potential DSPs will look up to.
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Old 16th October 2012, 04:33 PM   #2417
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Quote:
Originally Posted by Antoinel View Post
lhquam: What is the probability that a bright Software Engineer can devise a DSP to imbibe any line-level audio signal with triode, SIT, H2 and H3 , Pass amp, etc characteristics? Why continue to depend on future power amps to achieve these properties which at times appear vague?
It would seem logical but somehow the efforts in that direction have not
borne fruit. Similarly, simply introducing these elements on the front end
of the amplifier while using a highly linear output stage have not given the
same results.

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Old 16th October 2012, 04:41 PM   #2418
lhquam is offline lhquam  United States
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Apparently gm matching of the R100s isn't enough. In my case, I was able to obtain the desired results by swapping in a spare R100 and adjusting the Zen pots (effectively the source resistors). I haven't carefully checked the gm (or other) parameters of the R100s that are now in use.

Quote:
Originally Posted by dsdjoy View Post
I am having the same issue with one channel of a (Mu Follower) amp with matched Semisouth R100.

In one channel I can adjust H2 vs. H3 to desired level by varying source resistors.
The other channel is totally off, also having high H4 distortion.

Could it be an issue with Gate Leakage of R100, as described by Nelson for the R085 in the 'SiC Puppy SE Amp" thread ?
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Old 16th October 2012, 04:43 PM   #2419
lhquam is offline lhquam  United States
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Could it be that factors like output impedance and other load dependent behaviour haven't been addressed by those attempts?

Quote:
Originally Posted by Nelson Pass View Post
It would seem logical but somehow the efforts in that direction have not
borne fruit. Similarly, simply introducing these elements on the front end
of the amplifier while using a highly linear output stage have not given the
same results.

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Old 16th October 2012, 06:14 PM   #2420
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Quote:
Originally Posted by Nelson Pass View Post
It would seem logical but somehow the efforts in that direction have not
borne fruit. Similarly, simply introducing these elements on the front end
of the amplifier while using a highly linear output stage have not given the
same results.

I envision a multi-disciplinary team including gurus like you of high-end audio [a key contributor] revisiting and laying the framework for a solution to this question. Matter of time!
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