then apply some pressure to our official Golden Eared member from Germany
Oh, I am always willing to help, may be even by PM. My experience is reduced to a Mac program.
My friend dsdjoy uses ARTA very successfully on Windows. Yes I will try to gather some links and give you a starting point here in the next days!
0404.
Spent an entire week trying to get the DSP Patchmix program sorted. Now sorting the intput to output gain and trying to calibrate internal scope in Visual. Had it setup and used it successfully on F5T to test distortion, but didnt save settings and have been doing battle ever since. Arta is easier, but has its own issues.
Spent an entire week trying to get the DSP Patchmix program sorted. Now sorting the intput to output gain and trying to calibrate internal scope in Visual. Had it setup and used it successfully on F5T to test distortion, but didnt save settings and have been doing battle ever since. Arta is easier, but has its own issues.
I heard the F6 up to now in two constellations, first one, k2 about 15db higher than k3. I do not know at the moment if it was with pos or neg phase or even unequal phase between the channels. Second one, k2 and k3 at the same level.
Differences are soooooo big! First one lush, dark and heavy, second one crisp, present and quick.
So when you here your build first time and you are not happy with the sound trim it! Shape the sound man! (R* buzzforb) All is possible!
F6 is in this respect a wonderful lesson!
@botte: how much db did you choose k2 over k3, please?
@ flocchini: when you changed the value of source resistoNrs and looked for the sound difference....keep in mind that offset and bias must be regulated new, otherwise distortion values can change too, because of 200mV more offset and so on...The same is true when change the pairs sometimes...
Choosing the pot solution this is no more a problem, as Zen Mod confirms , a very pleasant situation!
Differences are soooooo big! First one lush, dark and heavy, second one crisp, present and quick.
So when you here your build first time and you are not happy with the sound trim it! Shape the sound man! (R* buzzforb) All is possible!
F6 is in this respect a wonderful lesson!
@botte: how much db did you choose k2 over k3, please?
@ flocchini: when you changed the value of source resistoNrs and looked for the sound difference....keep in mind that offset and bias must be regulated new, otherwise distortion values can change too, because of 200mV more offset and so on...The same is true when change the pairs sometimes...
Choosing the pot solution this is no more a problem, as Zen Mod confirms
, a very pleasant situation!
I had to make sure the Hanning filter was not on so the phase didn’t wrap in the Phase window of visual analyzer to get a better view of what direction the phase is in.
thank you Botte!
I can get this value also without using degeneration by choosing the right pair....!
But first I want to play the distortion tango!
I tried just matching transconductance but some other parameter(s) that was not being measured was also important. I suspect that it is the internal source resistance of the SS-R100.
Here is a paper I haev had for a while. It may be of interest to some.
http://socrates.berkeley.edu/~phylabs/bsc/PDFFiles/bsc4.pdf
If I get a chance, i am going to measure each of my 8 SS using both the curve tracer and the meothod above to see what we get. According to the paper above, both simple test should yield similar results.
The theory put forward so far is, that a jfet with lower yfs(transconductance) up top compared to bottom fet, should yield higher k2 to k3. With the same yfs for both top and bottom, cancellation of 2k is ecpected, as well as lower overall distortion. If this proves true, then it should be easy enough to work things out for higher K2 to K3, even using no degeneration(which I like best), if we put lower yfs fet up top. To get higher K2 up top should be easy if we add source degeneration, as we can alter the yfs of the top fet, yielding higher K2 even with perfectly matched pairs. There is some question as to whether the aforementioned threory is actually proving valid or if there is something else at work. We shall see.
Oh yeah.
This may take a while.
http://socrates.berkeley.edu/~phylabs/bsc/PDFFiles/bsc4.pdf
If I get a chance, i am going to measure each of my 8 SS using both the curve tracer and the meothod above to see what we get. According to the paper above, both simple test should yield similar results.
The theory put forward so far is, that a jfet with lower yfs(transconductance) up top compared to bottom fet, should yield higher k2 to k3. With the same yfs for both top and bottom, cancellation of 2k is ecpected, as well as lower overall distortion. If this proves true, then it should be easy enough to work things out for higher K2 to K3, even using no degeneration(which I like best), if we put lower yfs fet up top. To get higher K2 up top should be easy if we add source degeneration, as we can alter the yfs of the top fet, yielding higher K2 even with perfectly matched pairs. There is some question as to whether the aforementioned threory is actually proving valid or if there is something else at work. We shall see.
Oh yeah.
This may take a while.
Something screwey about it. Saw front page only[out of 23], and it froze the computer requiring a restart; twice.
