Ralf
If I have the attenuator at the output, I need two instead of one.
Even though I have the volume at input in my case, I hear no "sss" at all. In idling condition, I do not catch any sound at all.
I believe XSOZV2 works very well for the common mode noise rejection. I bet!
Nelson Pass prefers the size of the attenuator up to maximum 25k. Therefore, your 5k pot will work perfect.
Henrik
I hope you will make a good recovery from the tiredness soon.
JH
If I have the attenuator at the output, I need two instead of one.
Even though I have the volume at input in my case, I hear no "sss" at all. In idling condition, I do not catch any sound at all.
I believe XSOZV2 works very well for the common mode noise rejection. I bet!
Nelson Pass prefers the size of the attenuator up to maximum 25k. Therefore, your 5k pot will work perfect.
Henrik
I hope you will make a good recovery from the tiredness soon.
JH
Hi all
Last night, I was listening to nice music.
While the DVD player was on run, I turned off the power of XSOZV2. The
music was off. Next I turned off the power of BOSOZ, and the music came up
very shortly and off. It was very funny. I tried again, and the same thing
occurred.
I wanted to figure out the ghost, but in vein.
Could you explain me why? Thanks.
JH
Last night, I was listening to nice music.
While the DVD player was on run, I turned off the power of XSOZV2. The
music was off. Next I turned off the power of BOSOZ, and the music came up
very shortly and off. It was very funny. I tried again, and the same thing
occurred.
I wanted to figure out the ghost, but in vein.
Could you explain me why? Thanks.
JH
Anael
Meanwhile, if Y ou haven´t done it already, You can read my post on CCS tests I have done: http://www.diyaudio.com/forums/showthread.php?s=&threadid=3949&perpage=15&pagenumber=28
Meanwhile, if Y ou haven´t done it already, You can read my post on CCS tests I have done: http://www.diyaudio.com/forums/showthread.php?s=&threadid=3949&perpage=15&pagenumber=28
Henrik
I have two questions.
1. How can I get the value of 750 ohm output impedence?
2. Was the test with only "one CCS tail?"
Thanks.
JH
I have two questions.
1. How can I get the value of 750 ohm output impedence?
2. Was the test with only "one CCS tail?"
Thanks.
JH
jh6you
1. To be more accurate, Your outputimpedance is 970 Ohm, (R1+R2) 750 Ohm + (R7) 220 Ohm = 970 Ohm. This resistance wil be "grounded" through the inputimpedance of the poweramp. So thus outputimpedance and inputimpedance will split the BOSOZ powersupply voltage and then lover the voltage seen at the drains at Your BOSOZ. So therefore You need a relatievly low outputimpedance and a relatievly high inputimpedance in order not to loose too much voltage at the inputload of Your poweramp.
My XBOSOZ has the same values at the drain, but the X feedback lower the outputimpedance to 10 Ohm singleended, that one is harder for me to explain.
This is my understanding of the theory, and it fits with my mesaurements in the simulator.
2. My tests is done with only one CCS, and this because of the X in my XBOSOZ.
1. To be more accurate, Your outputimpedance is 970 Ohm, (R1+R2) 750 Ohm + (R7) 220 Ohm = 970 Ohm. This resistance wil be "grounded" through the inputimpedance of the poweramp. So thus outputimpedance and inputimpedance will split the BOSOZ powersupply voltage and then lover the voltage seen at the drains at Your BOSOZ. So therefore You need a relatievly low outputimpedance and a relatievly high inputimpedance in order not to loose too much voltage at the inputload of Your poweramp.
My XBOSOZ has the same values at the drain, but the X feedback lower the outputimpedance to 10 Ohm singleended, that one is harder for me to explain.
This is my understanding of the theory, and it fits with my mesaurements in the simulator.
2. My tests is done with only one CCS, and this because of the X in my XBOSOZ.
Henrik
1. My understanding is aligned (voltage divider). Then, I believe that we could drive your XSOZ by increasing the gain of my BOSOZ. Do you agree?
2. Why no experiment with two CCS tail? Even if it is just for fun...
JH
1. My understanding is aligned (voltage divider). Then, I believe that we could drive your XSOZ by increasing the gain of my BOSOZ. Do you agree?
2. Why no experiment with two CCS tail? Even if it is just for fun...
JH
jh6you
1. Right, if You lower the gain controlling resistor to 10 to 15 Ohm, it can be done. But I am not shure if this is the best way to do it. You looses a lot of gain into the load, it is in my oppinion better to use (rather than loose) it in the x-feedback.
2. The X need all the gain available in the feedback loop, so no gain reducing resistors between tails, thus only one CCS. And I have unmounted the attachments for the test CCS´s in order to go back to normal functionality. I think I have a really good reason to beleve in the resistors at the tail rather than the CCS´s.
Anael
I will still come back to Your questions, but I would like to answer them in the best way, and that is when my hed isn´t that tired.
1. Right, if You lower the gain controlling resistor to 10 to 15 Ohm, it can be done. But I am not shure if this is the best way to do it. You looses a lot of gain into the load, it is in my oppinion better to use (rather than loose) it in the x-feedback.
2. The X need all the gain available in the feedback loop, so no gain reducing resistors between tails, thus only one CCS. And I have unmounted the attachments for the test CCS´s in order to go back to normal functionality. I think I have a really good reason to beleve in the resistors at the tail rather than the CCS´s.
Anael
I will still come back to Your questions, but I would like to answer them in the best way, and that is when my hed isn´t that tired.
Henrik
- Well noted. The pre and the main act like two resistors and so as a voltage divider. Accordingly, the lower output impedance means a better voltage source. Nevertheless, many DIYers use the volume attenuators at the output stage of the pre with no particular concern.
- I recommend to put the gain control resistor between two CCS tails, and to have an experiment. It could be very interesting sonic effect test.[/list=1]Regards
JH
1. Yes, because of a much higer inputimpedance than the 120 Ohm at the poweramp, more like 10K to 50K. Also Nelson recommends max. 5K potentiometer at the output, just to avoid the higher outputimpedance.
2. In the X amps I know of has no gaincontrol resistor between two CCS´s. I stick to my resistors for the timebeeing. But if You do the test, I would very much like to hear about it.
🙂
2. In the X amps I know of has no gaincontrol resistor between two CCS´s. I stick to my resistors for the timebeeing. But if You do the test, I would very much like to hear about it.
🙂
Henrik
I think that you understand the X better.
By the way, how do you explain the two tails of the resistors.
Why two?
JH
I think that you understand the X better.
By the way, how do you explain the two tails of the resistors.
Why two?
JH
I think the diff pair tails play an important X-role in distortion and noise cancellation. One tail, not split into two, stops the role. O…? Wrong…? Still I will go for the two. Who knows… two could be better anyhow than one…? I am silly and my friends call me so. Hahaha…
JH
JH
Henrik
whats the difference in your x bsoz between ccs 01 -04.
What for is the ccs good?
ist it hearable in comparison to your x bsoz without ccs?
Regards,
Ralf
whats the difference in your x bsoz between ccs 01 -04.
What for is the ccs good?
ist it hearable in comparison to your x bsoz without ccs?
Regards,
Ralf
Ghost 
Henrik
Henrik,
what`s with aleph p1.7 do you think can use this one for your XSOZ and for the Xsoz of Jh6you?
When i try both Xsoz i wouldn`d need to build two XBOSOZ`s 🙂
Regards,
Ralf🙂
Henrik said:
Henrik,
what`s with aleph p1.7 do you think can use this one for your XSOZ and for the Xsoz of Jh6you?
When i try both Xsoz i wouldn`d need to build two XBOSOZ`s 🙂
Regards,
Ralf🙂
Single Blowtorch Ended
Hi,
I just wondering about the CTC Builders Blowtorch this is a single ended line stage, what kind of design John Curl use ? a Pass clone ? no Sirs he has designed the ulrimative single end circuit with high grade components like super matched semiconductors and passive parts and the circuit topolgy is outstanding "never seen before" topolgy.
Now, why can't we amateurs clone this way of design as it may be very cheap, a single end design very often consists of a small amount of components, but... if you like me think, I buy a gang of reed switches the very special gold 5 mm, sorry Sir I can only deliver 2000 of them so the price will be 1000 $.
I now understand why the SOTA is so expensive, can we make a sort of standard with very high demands on a few key components maybe we can make a unbeatble, in this case single ended, circuit design what you think am I wrong or.. am I right.
Unite make a choice make way for new thinking.😀
Hi,
I just wondering about the CTC Builders Blowtorch this is a single ended line stage, what kind of design John Curl use ? a Pass clone ? no Sirs he has designed the ulrimative single end circuit with high grade components like super matched semiconductors and passive parts and the circuit topolgy is outstanding "never seen before" topolgy.
Now, why can't we amateurs clone this way of design as it may be very cheap, a single end design very often consists of a small amount of components, but... if you like me think, I buy a gang of reed switches the very special gold 5 mm, sorry Sir I can only deliver 2000 of them so the price will be 1000 $.
I now understand why the SOTA is so expensive, can we make a sort of standard with very high demands on a few key components maybe we can make a unbeatble, in this case single ended, circuit design what you think am I wrong or.. am I right.
Unite make a choice make way for new thinking.😀