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John Curl's Blowtorch preamplifier part III
John Curl's Blowtorch preamplifier part III
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Old 19th February 2018, 12:59 AM   #91
RNMarsh is offline RNMarsh  United States
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More reading material ... trying to get it all out in short time and not spread out thru 100,000 pages.


http://www.waltjung.org/PDFs/A_RealT...or_Quality.pdf


https://www.researchgate.net/profile...io-Systems.pdf

Product Information: PMLCAP Technical Notes/Capacitor, Power Supply Units RUBYCON CORPORATION


THx-RNMarsh

Last edited by RNMarsh; 19th February 2018 at 01:17 AM.
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Old 19th February 2018, 01:02 AM   #92
scott wurcer is offline scott wurcer  United States
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The first 10min or so or until you get to the Pono comments is charming.

YouTube
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Old 19th February 2018, 01:07 AM   #93
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by RNMarsh View Post
I already said John and Walt were not interested in any input that showed how slight the effects really were and that there was no real distortion (THD/IMD).
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Old 19th February 2018, 01:07 AM   #94
hitsware is offline hitsware
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> NOS PP

NewOldStock PolyPropylyn ?
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Old 19th February 2018, 01:09 AM   #95
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by hitsware View Post
> NOS PP

NewOldStock PolyPropylyn ?
Yes, https://www.surplussales.com/
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Old 19th February 2018, 01:30 AM   #96
nezbleu is offline nezbleu  Canada
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John Curl's Blowtorch preamplifier part III
Quote:
Originally Posted by Markw4 View Post
More seriously, how many years have Scott and Ed been having these arguments?
Dunno, lots I guess. I think they are productive, at least when they listen to each other, which I think they mostly do.

Quote:
How many more years will they keep it up?
If I may answer a question with a question, "What's the difference between ignorance and apathy?" (Answer: "I don't know and I don't care.")

They are big boys and if they want to stop kvetching they both know how, without your help.

Quote:
Let me ask you, you already said what you don't want, would you like to say what kind of a DIY forum you do want?
The kind where you aren't trying to referee. The kind where two smart guys can have a spirited discussion without some third party telling them how they are allowed to respond (we have moderators for that, and they are pretty good). The kind where a purely technical discussion can be carried on without some one trying to enforce a safe space.

While we're at it, I took great exception to your remarks about SY the other day, especially because of the hypocrisy. You made some very disparaging, personal remarks about him, called him rude, etc and never once addressed his technical arguments. Your attack on his character was purely personal. I don't know SY, he is not a friend of mine, but I have had some interactions with him on this forum (some private), and I have always found him generous, technically proficient, and honest. He has sometimes challenged assertions from some members who seemed ill informed, and that has sometimes led to some heated exchanges, but the heat was generally on the other side, SY has a knack for keeping it light. In many cases public rancour turned to private agreement, though we generally don't get to see that.

Now in the two pieces that Scott linked to, SY asked a question, provided some historical background, then showed his technical analysis. If you disagree with his analysis you are free to provide a critique, but you didn't do that. Some other guy chose to attack him, saying he was technically incompetent, unfamiliar with audio, or dishonest. SY responded with humour and a clear technical correction to the criticism. But you somehow decided that made SY the bad guy, rude, and aggressive, and you chose to criticize him for your perceived shortcomings, rather than addressing his analysis. That was pure bush league, cheap, nasty, and lowered the quality of technical discussion on this forum.

But I enjoy your contributions here when you focus on the technical and share your experiences. I think you have a lot to offer, even when I don't agree with you, but I wish you would lay off the personal stuff. You don't need to tell Scott how to talk to Ed, and if you think you do maybe it should be done privately. Maybe I should take my own advice!

You asked...
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Old 19th February 2018, 01:47 AM   #97
RNMarsh is offline RNMarsh  United States
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LTE at TAA mag re cap articles --

TAA Cap comment.jpg


THx-RNMarsh
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Old 19th February 2018, 01:54 AM   #98
john curl is offline john curl  United States
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When it comes to non-linear distortion. Both hi Q ceramics and Tantalum caps have the most, AND hi Q ceramics are still used as coupling caps today! How unfortunate. Of course, they also have DA as well.
Attached Images
File Type: jpg cap distortion.jpg (451.8 KB, 270 views)
File Type: jpg cer cap.1a.jpg (924.2 KB, 269 views)
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Old 19th February 2018, 01:54 AM   #99
RNMarsh is offline RNMarsh  United States
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Quote:
Originally Posted by scott wurcer View Post
I already said John and Walt were not interested in any input that showed how slight the effects really were and that there was no real distortion (THD/IMD).
Its all put there for others to read and think about and decide for themselves.
Many have not read these and some others I am looking for.

I am old. SY was rude and annoying and I never learned anything useful from him. Always asked for what would amount to a PHD dissertation about everything you said. A good way to end any conversation in difference to his opinions. he was hard-core about DBLT as the final answer. IMO, of course. Nice guy? probably. But, I don't miss him here.


-RNM

Last edited by RNMarsh; 19th February 2018 at 02:03 AM.
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Old 19th February 2018, 01:59 AM   #100
chris719 is offline chris719  United States
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John Curl's Blowtorch preamplifier part III
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Originally Posted by john curl View Post
When it comes to non-linear distortion. Both hi Q ceramics and Tantalum caps have the most, AND hi Q ceramics are still used as coupling caps today! How unfortunate. Of course, they also have DA as well.
What modern "hi-fi" gear have you opened that uses a X7R, Z5U, Y5, etc. ceramic cap?
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