FirstWatt J2 - Page 69 - diyAudio
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 6th November 2012, 09:34 PM   #681
dsdjoy is offline dsdjoy  Germany
diyAudio Member
 
Join Date: Jun 2009
Send a message via Skype™ to dsdjoy
Still working on J2, feeling more dumb every day, I decided to start writing my experiences down....
More to come....some chapters are still waiting for less dumb persons than me to be filled...

book.jpg
  Reply With Quote
Old 6th November 2012, 09:55 PM   #682
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
grünschnabel !

you're only at 4-th edition !

mine is at least 224-th , still not final

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 6th November 2012, 10:09 PM   #683
labjr is offline labjr  United States
diyAudio Member
 
Join Date: Apr 2003
Location: MA
No official circuit for the J2 yet?
  Reply With Quote
Old 6th November 2012, 10:22 PM   #684
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
nope
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 6th November 2012, 11:07 PM   #685
dsdjoy is offline dsdjoy  Germany
diyAudio Member
 
Join Date: Jun 2009
Send a message via Skype™ to dsdjoy
Quote:
Originally Posted by Zen Mod View Post
grünschnabel !

Exactly ! Still wet behind the ears

As you are on your 224th Edition, I'd be happy to cite you in the Chapter: Dirty tricks - How to get 2nd harmonic to 0.023% and 3rd harmonic to 0,004% by using artistically, carefully unmatched semisouth or ZenMods famous ZenPot

With CCS at 20mA and some semisouth source-resistor tweaking the 2nd and 3rd harmonics looked fine, when getting back to 10mA CCS the values are far too low and the amp sounds too thin and uninvolving.

I need some help... easy instructions....for dummies like me.....

Last edited by dsdjoy; 6th November 2012 at 11:11 PM.
  Reply With Quote
Old 6th November 2012, 11:24 PM   #686
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
or just fold input LTP (inner drain) to lower SJEP source



it's easy - you just need original one ( which you have ) , few basic instruments for testing each part's static characteristics , and good THD meter

or - even simpler - you need better spks , so every amp will work just good

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 7th November 2012, 01:26 AM   #687
Banned
 
Join Date: Nov 2008
He he

Everything is secret !
The future still dark but not for me :-)
  Reply With Quote
Old 7th November 2012, 01:17 PM   #688
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
the problem is not as easy...

my friend dsdjoy succeeded in cloning the THD spectra 98%, even Nelson got a nice picture of the similar spectra of clone and original and accepted that dsdjoy had done a good job.

But the original still sounds better...... !

and the master is laughing......or..... or....
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 7th November 2012, 01:33 PM   #689
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
if you boys got it 98% of THD spectra , rest is in your head

I had short circ between two headphones too many times , so I know how's that

__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM
  Reply With Quote
Old 7th November 2012, 01:42 PM   #690
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
Quote:
But the original still sounds better...... !
Could it be some other part you are overlooking that is effecting the sound of your J2?
Maybe it was some other choice in part(s) and not your circuit design that's having, to your ears, a negative effect or less than perfect result.

What about polarity at the speakers? What about break-in time? What about grounding scheme? Power supply? etc, etc.

Maybe you are dead on target, but just overlooking one small piece. Just a thought.
Hope you find the missing piece. Really do!

Vince
__________________
I build, therefore I am.
  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
An another way to Firstwatt F1? Idefixes Pass Labs 5 1st February 2012 08:40 PM
Subwoofer and Firstwatt F1 tgrauss Subwoofers 10 3rd June 2009 04:29 PM
Fostex and Firstwatt in car? Ipanema Car Audio 2 11th February 2008 05:32 AM
FirstWatt.com Rory Christ Pass Labs 121 31st May 2004 07:02 PM


New To Site? Need Help?

All times are GMT. The time now is 10:22 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