Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 11th March 2013, 01:22 AM   #3821
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by Zen Mod View Post
you should try that with two already made pcbs

matter of one wire

or not even that ; careful measurement will only tell is it any gain in common feedback arrangement ( for two halves of balanced ) vs. regular fdbck against real gnd scheme

think of function of McMilan resistors ; in some balanced configurations/parts values combos they're more effective , in some are almost zilch effective
Have them sitting right here waiting on parts. Doesnt value play into this dance.
__________________
...Shape the sound , Man!

Last edited by buzzforb; 11th March 2013 at 01:27 AM.
  Reply With Quote
Old 11th March 2013, 02:20 AM   #3822
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
So I have a question before bed. If error current is introduced into source of complimentary source followers, is it doing any good, as the signal is not taken from the drain? It would seem that any correction that might be gained will run smack into the "corrected signal"
Mcmillan resistor is not well explained in my findings. It seems to be a point of control over the reaction of the two halves, increasing or diminishing the effectiveness of the error current.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 11th March 2013, 10:06 AM   #3823
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally Posted by buzzforb View Post
So I have a question before bed. If error current is introduced into source of complimentary source followers, is it doing any good, as the signal is not taken from the drain? It would seem that any correction that might be gained will run smack into the "corrected signal"
Mcmillan resistor is not well explained in my findings. It seems to be a point of control over the reaction of the two halves, increasing or diminishing the effectiveness of the error current.
as I already wrote to you - some of these things are hard for me to shape in writing ; however - signal taken from the drain isn't conditio sine qua non for feedback function , as you know .

observe one half - you can make it in myriad of ways , especially considering FB route ; if you're able to connect two identical halves in way that returning feedback is going to each input(better put - influencing each input ) from other halve's output , that's SUSY ; so - just think polarity and FB injecting point and condition of crossfeedback

any further explanation will lead me to public yukyuk about Ultrasymmetry ( thing still not existing in any amp in our Universe and neighboring ones ) and I don't wanna do that

thought ...... to complicate things further - conceptually - you can imagine these two complementary buffers as sort of twisted (gainless ) nasty UGSess

gollumgollum
__________________
my Papa is smarter than your Nelson !
tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb ; Papatreasure

Last edited by Zen Mod; 11th March 2013 at 10:11 AM.
  Reply With Quote
Old 11th March 2013, 10:10 AM   #3824
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
I was even thinking about ZV6 and how Nelson talked about the fact that SUSY was more effective in two stage topologies, meaning gain stages, I assume. THis is just single stage as it sits. But moi haev an idea. Look at it this way. I am only a decade behind current developement
__________________
...Shape the sound , Man!
  Reply With Quote
Old 11th March 2013, 10:16 AM   #3825
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
it's better than moi - always on pointy peak of development - while I'm fooling around , I don't have a slightest clue what serious ppl around me are really doing
Attached Images
File Type: gif pajapatak.gif (19.1 KB, 267 views)
__________________
my Papa is smarter than your Nelson !
tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb ; Papatreasure
  Reply With Quote
Old 11th March 2013, 10:20 AM   #3826
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally Posted by buzzforb View Post
..... THis is just single stage as it sits......
yes and no

it's having phase splitter and gain stage ; so sort of two

however - I'm not digging that condition of two stages

maybe he said that you need to have one left and one right stage , for SUSY

one LTP is enough for Full Monty

what is hard , is - to make it simpler that that

edit - just came to my mind - I remember seeing looong time ago schematics in yore periodics - it seems that xformer stereo matrix gadgets had some sort of X feedback , in starting era of Stereo ; so - there was no even LTP in them , at least not "active" ones
__________________
my Papa is smarter than your Nelson !
tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb ; Papatreasure

Last edited by Zen Mod; 11th March 2013 at 10:25 AM.
  Reply With Quote
Old 11th March 2013, 10:32 AM   #3827
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Transformers make my brain hurt. I can see how they would be perfect in the sense that they are, in themselves a sort of balancing act, as you say. But what to do with the dman things in this situ.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 11th March 2013, 03:43 PM   #3828
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Quote:
Originally Posted by buzzforb View Post
My little freak.
buzzforb. Your PCB is a piece of art too. I hope that you'll have a future kit with it.
  Reply With Quote
Old 11th March 2013, 03:55 PM   #3829
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Might not be worth circuit board it is printed on. Easy enough to try once parts come in.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 11th March 2013, 04:24 PM   #3830
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Quote:
Originally Posted by Zen Mod View Post
nice



now - do the same , but with just one xformer


Zen Mod. I wrote a schematic for a bridge diyF6 using one transformer [post #3619]. It had limitations:
  • one end of the brige is a voltage source amp while the other end is current source amp.
  • A coupling cap to the gate of the bottom JFET of the current source amp.
You wrote that one may get a SuSy via the Jensen's transformer windings in your and/or buzzforb's diyF6 bridge; interesting comment; the practice of which maybe nurtured..

I have a general comment on bridge amps. Bridge F6 with F5 or bridge F5 with L'Amp a simple SIT ala Rothacher, or bridge an SE triode amp with a SIT. One has a fertile ground to treat its hearing to the best amps of highest state of the art and science. Does anybody see anything irregular with this approach?
  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
New F6 diy coming soon ? Nounours18200 Pass Labs 37 31st August 2012 04:35 PM
Hi Vi F6 box ioro Multi-Way 4 15th April 2012 08:27 PM
Whats happening with F6? jugoslavija Pass Labs 1 1st November 2011 07:39 AM
Hi-Vi F6 kkosiba Multi-Way 14 9th November 2007 08:38 AM
F6 traw Pass Labs 7 2nd November 2007 07:09 PM


New To Site? Need Help?

All times are GMT. The time now is 08:32 AM.


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