HPS 4.0 phono stage - Page 22 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th November 2009, 04:28 PM   #211
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Higher order AM and FM distortion can be introduced, even as lower order AM distortion is significantly reduced.
  Reply With Quote
Old 15th November 2009, 04:35 PM   #212
Banned
 
Join Date: Nov 2005
Location: McKinney, TX
Quote:
Originally Posted by john curl View Post
Higher order AM and FM distortion can be introduced, even as lower order AM distortion is significantly reduced.
So large amounts of negative feedback are to be avoided, correct? I was always told that open loop distortions should be minimized so that lesser amounts of negative feedback would be needed. Is that a true statement or a wives' tale?
  Reply With Quote
Old 15th November 2009, 04:42 PM   #213
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Sounds like the right approach to me.
  Reply With Quote
Old 15th November 2009, 06:13 PM   #214
syn08 is offline syn08  Canada
Account disabled at member's request
 
Join Date: Aug 2005
Location: Toronto
Quote:
Originally Posted by john curl View Post
Higher order AM and FM distortion can be introduced, even as lower order AM distortion is significantly reduced.
Quote:
Originally Posted by Curly Woods View Post
So large amounts of negative feedback are to be avoided, correct? I was always told that open loop distortions should be minimized so that lesser amounts of negative feedback would be needed. Is that a true statement or a wives' tale?
Quote:
Originally Posted by john curl View Post
Sounds like the right approach to me.
This is 100% wrong, and it was proven thoretically and experimentally to Kingdom Come.

Stop polluting this thread with such crap. One thread (BT) should be enough to accomodate 40 years of chasing ghosts.
  Reply With Quote
Old 15th November 2009, 06:44 PM   #215
Banned
 
Join Date: Nov 2005
Location: McKinney, TX
Quote:
Originally Posted by syn08 View Post
This is 100% wrong, and it was proven thoretically and experimentally to Kingdom Come.

Stop polluting this thread with such crap. One thread (BT) should be enough to accomodate 40 years of chasing ghosts.
Excuse me but I have always heard this as the truth due to increase in IMD with excessive NFB. Are you say that this does not happen? Where has it been proven? I thought that Matti Otala, among others documented this back in the 70's?

Last edited by Curly Woods; 15th November 2009 at 07:04 PM.
  Reply With Quote
Old 15th November 2009, 06:57 PM   #216
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Now, what is a myth?
  Reply With Quote
Old 15th November 2009, 07:12 PM   #217
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Just to be polite about it, were you not, Syn08, the person who was originally going to use an AD797 or its equivalent in output current, to drive a very low resistance feedback network, until we convinced you otherwise? You need a bit more, 'seasoning' still, before calling me 'names'.
  Reply With Quote
Old 15th November 2009, 07:37 PM   #218
Banned
 
Join Date: Nov 2005
Location: McKinney, TX
Bob Cordell does not seem to agree with Otala's agruments from what I have read, but he is one of the few. Does Bob also think that people can not hear TIM? I could not find any reference to this subject.
  Reply With Quote
Old 15th November 2009, 09:22 PM   #219
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
I think it is a good thing when distortion is low and i think circuits with extremely high amounts of feedback can be made to sound good. Again i claim Douglas Self that has researched if there is any low level problem but he did not find anything. In recent years people like Cyryl Bateman and Ed Simon have shown that low level distortion exits in passive parts but they are extremely low level down at least -130dB. if this is audible is open to debate and we should not trample on each other discussing minor things like that. by the way Syn08 i am very happy that you are not leaving us alone here. i think this thread got so popular because it is very controversial and we need you here as the solid rock you seem to be. So john please build two phonostages that measure EXACTLY the same and have the same topology but other parts and play them for me. when i hear a difference i send you some of our famous westfalia ham. i come to the states at the end of november and visit my fellow Allen Perkins so i am in the area.
  Reply With Quote
Old 15th November 2009, 09:22 PM   #220
orjan is offline orjan  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Stockholm
The disagreement is not weather tim could be heard on not, rather what design rules to use to avoid it.

/örjan
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
All DHT Phono Stage Steve Cresswell Tubes / Valves 32 2nd April 2013 06:24 PM
DIY phono to replace roksan phono stage seroxatmad Analog Line Level 6 14th December 2008 05:46 PM
new phono stage or old preamp with phono? flohmann Analog Line Level 2 2nd October 2008 09:51 PM
Should I replace Scott 222C phono stage with Claret phono stage? Bing Yang Analogue Source 0 22nd August 2005 06:41 AM
Phono Stage ruangrit Analogue Source 1 11th October 2003 10:13 AM


New To Site? Need Help?

All times are GMT. The time now is 10:38 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2