Capt, that is interesting historical information. I have a Tube - Fet Arthur Loesch MC build by Jürgen Ultee that uses the 2SK147 in a Tube-Fet cascode but i myself have no experience with this part other then listening to Jürgens creation. I can not make it to CES this year so i am very sorry to miss that oportunity. Maybe i can find a friend that carries them home.
Are you the gentman that gave me historical 2SK170, 2SJ74 in the first place ?
If yes, that was much apreciated. It´s now time to reveil the Fets i use. I promisse not to hide anything here i publish. It´s the 2SK369. Look at the ID curve over UDS ( or Vds if you will ) at 10mA idle for example. Where the 2SK170 has a visible bend the plot of the 2SK369 is rather flat. That translates into a very high early voltage and that has a lot of consequences that i will try to explain.
Are you the gentman that gave me historical 2SK170, 2SJ74 in the first place ?
If yes, that was much apreciated. It´s now time to reveil the Fets i use. I promisse not to hide anything here i publish. It´s the 2SK369. Look at the ID curve over UDS ( or Vds if you will ) at 10mA idle for example. Where the 2SK170 has a visible bend the plot of the 2SK369 is rather flat. That translates into a very high early voltage and that has a lot of consequences that i will try to explain.
Hi Joachim, not sure I follow, but I'm positively sure the servo won't be able to fix both problems, the output offset and the voltage at the drains collector junction. Yes, I think temperature can play a major role here, it may trigger the flipping, since the gain is very large.
Re my other questions, I wrote and got an email response from SYN08 and I think I now have the answers to my early other questions (compensation and RC cell). Pretty clever ideas, I would say. BTW, don't answer if you don't feel like, but have you considered asking him for permission to use the circuit (or the original ideas included into that, as per your post #1940 and #1972)? Not to say he didn't hereby overreacted, but he seem to be a nice guy though...
Where do you think i should go ?
I continued this discussion only because i got requests. So this is all in retrospect. I already canceled the project in question and non of the circuits published here got ever into a product anyone can buy.
My assotiated whould kill me if i publish a circuit here that they financed.
I give up. Lets NEVER talk about that circuit again here please.
I continued this discussion only because i got requests. So this is all in retrospect. I already canceled the project in question and non of the circuits published here got ever into a product anyone can buy.
My assotiated whould kill me if i publish a circuit here that they financed.
I give up. Lets NEVER talk about that circuit again here please.
See my last post YWN. If i will ever use again an idea he originally had and i am not so blind not to realise it i will ask him for permission. Reading his words though about my
non existing abilities to measure and design i am not sure if he ever will realise my aproach more then an insect trying to stitch him.
i am totally demotivated now and stop my thread.
This does not make any sense to me any more.
Good by friends.
non existing abilities to measure and design i am not sure if he ever will realise my aproach more then an insect trying to stitch him.
i am totally demotivated now and stop my thread.
This does not make any sense to me any more.
Good by friends.
Congratulations YWN, what a heartening move.
Err... must go to bed now... did i do something wrong, sorry Joachim and everbody else...
Hi Joachim,
hundreds of diy'ers will be very sad, if you will stop your thread.
Please take some hours of sleep and reconsider your decision
Sometimes there are missunderstandings, and people do not recognize that things are finished and are given to the filling basket.
The www gives us the opportunity to share and support your research, and especially for me dummkopf, to participate.
Please keep going on.
Herzliche Grüße
SAm
hundreds of diy'ers will be very sad, if you will stop your thread.
Please take some hours of sleep
and reconsider your decisionSometimes there are missunderstandings, and people do not recognize that things are finished and are given to the filling basket.
The www gives us the opportunity to share and support your research, and especially for me dummkopf, to participate.
Please keep going on.
Herzliche Grüße
SAm
So Syn08 and YMV are pissed because of a topolgy mentioned since perhaps 1969 (1.Version Tietze-Schenk) and Joachim is to stop developing and contributing to the community? Salas is right, what a heartening move
Joachim,
I have been a member here for more than 8 years. I completely understand how you feel, but please take it easier. This is a virtual communication and you may expect all possible kind of reactions.
I believe you will return and will be overlooking some posts.
I have sent you an e-mail, and I hope I have used a correct e-mail address. Please let me know.
Best regards,
I have been a member here for more than 8 years. I completely understand how you feel, but please take it easier. This is a virtual communication and you may expect all possible kind of reactions.
I believe you will return and will be overlooking some posts.
I have sent you an e-mail, and I hope I have used a correct e-mail address. Please let me know.
Best regards,
Wazzup with you people, chill down, am not pissed at anybody or anything, just asked some questions, sorry for stepping on a hornet's nest
Hello friends !
I will not take back my decission. The MPP thread will not be fueled by me any more.
If you have the desire to post here please do and i take the option if i answer or not but i will not publish any further circuits here.
You will not totally loose me though i am afraid.
I started the ZDL thread some time ago and have done some research in the backround.
I am now in contact with Dominik Stoll so you will see some progress there.
Instead of the MPP thread i plan to start a thread called " Measuring Low Level Stages".
It will have a wider scope then just phonostages and will include measurements on linestages too. I also badly have to learn more about PSU´s so this gives me the oportunity to look into that. This new thread may not contain as much circuit diagrams as you are used too from me and i will try to hold back my subjective impressions a bit but i can not swear on that. Thanks people, this thread was an amasing experience with your contribution.
I will not take back my decission. The MPP thread will not be fueled by me any more.
If you have the desire to post here please do and i take the option if i answer or not but i will not publish any further circuits here.
You will not totally loose me though i am afraid.
I started the ZDL thread some time ago and have done some research in the backround.
I am now in contact with Dominik Stoll so you will see some progress there.
Instead of the MPP thread i plan to start a thread called " Measuring Low Level Stages".
It will have a wider scope then just phonostages and will include measurements on linestages too. I also badly have to learn more about PSU´s so this gives me the oportunity to look into that. This new thread may not contain as much circuit diagrams as you are used too from me and i will try to hold back my subjective impressions a bit but i can not swear on that. Thanks people, this thread was an amasing experience with your contribution.
That's a perfect idea, please consider my 2 cents:
Attachments
Joachim,
I can understand your decision but would like to say that I thought the Mpp thread had a wealth of interesting things, ideas and thoughts. Thank you for that.
jan didden
YWN....
YWN
Having checked your posts on other threads it is obvious that you are quite relentless in extracting information which you believe you need. A bit like a dog with a bone, as it were.
This thread has proved to be one of the best on the WEB regarding any specific audio DIY area. Joachim is a professional who has been in the industry for years. It seems at a quick reading that you spotted some similarity with an existing design and posted the fact in a rather pointed if succinct manner. In response Joachim immediately not only ceased work on that design but also made that fact clear in the thread and most definitely had closed down anything to do specifically with that design and the principles which were in question. Yet you persisted in questioning various aspects of that clearly abandoned concept.. [I actually believe that Joachim would also have destroyed his notes on that design as he has a highly developed concept of personal honour.]
Eventually Joachim felt that your questioning was so persistent that he had simply had enough and withdrawn, effectively leaving the thread at large hanging in the air. IF provoking that was your intention I must acknowledge your success.... but I would not congratulate you.
Others imply that you are in their opinion a ventriloquist's dummy for Syn08 (With or without his knowledge). I believe, having seen that you have been equally persistent on other threads, that it is just in your nature to behave like that and that your quest for knowledge / infliction of what you know/think is so strong as to make consideration of the feelings of others impossible for you to embrace.
What that selfishness has achieved is the ending of a very very good thread and there are as a result a great number of people who have been deeply disappointed. NO-ONE has done more than Joachim in terms of sharing not only his knowledge and development of so many projects, but he has also put a wealth of designs into the public domain. Nelson Pass also - of his generosity - has given a vast number of designs to this community with nothing asked for in return. John Curl has - rather than give away schematics - provoked people to THINK and has done much to bring about more focused thought.
I suggest that you READ what is said and act with far more humility than you have shown to date. You - and everyone else here - has no God given right to wring the last bit of information out of anyone. The site is run by common consent and relies upon an innate sense of reasonableness and balance. It is this aspect of reasonableness which you have pushed beyond any acceptable limit and with such dire consequence.
That your questioning and disagreement with explanations given resembles a form of interference used by many to disturb forum threads - or to purposely trip other posters [a form of cyber blood sport] - both here and elsewhere may or may not be relevant. .
YWN
Having checked your posts on other threads it is obvious that you are quite relentless in extracting information which you believe you need. A bit like a dog with a bone, as it were.
This thread has proved to be one of the best on the WEB regarding any specific audio DIY area. Joachim is a professional who has been in the industry for years. It seems at a quick reading that you spotted some similarity with an existing design and posted the fact in a rather pointed if succinct manner. In response Joachim immediately not only ceased work on that design but also made that fact clear in the thread and most definitely had closed down anything to do specifically with that design and the principles which were in question. Yet you persisted in questioning various aspects of that clearly abandoned concept.. [I actually believe that Joachim would also have destroyed his notes on that design as he has a highly developed concept of personal honour.]
Eventually Joachim felt that your questioning was so persistent that he had simply had enough and withdrawn, effectively leaving the thread at large hanging in the air. IF provoking that was your intention I must acknowledge your success.... but I would not congratulate you.
Others imply that you are in their opinion a ventriloquist's dummy for Syn08 (With or without his knowledge). I believe, having seen that you have been equally persistent on other threads, that it is just in your nature to behave like that and that your quest for knowledge / infliction of what you know/think is so strong as to make consideration of the feelings of others impossible for you to embrace.
What that selfishness has achieved is the ending of a very very good thread and there are as a result a great number of people who have been deeply disappointed. NO-ONE has done more than Joachim in terms of sharing not only his knowledge and development of so many projects, but he has also put a wealth of designs into the public domain. Nelson Pass also - of his generosity - has given a vast number of designs to this community with nothing asked for in return. John Curl has - rather than give away schematics - provoked people to THINK and has done much to bring about more focused thought.
I suggest that you READ what is said and act with far more humility than you have shown to date. You - and everyone else here - has no God given right to wring the last bit of information out of anyone. The site is run by common consent and relies upon an innate sense of reasonableness and balance. It is this aspect of reasonableness which you have pushed beyond any acceptable limit and with such dire consequence.
That your questioning and disagreement with explanations given resembles a form of interference used by many to disturb forum threads - or to purposely trip other posters [a form of cyber blood sport] - both here and elsewhere may or may not be relevant. .
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