F6 Amplifier - Page 405 - 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 27th March 2013, 01:29 PM   #4041
diyAudio Member
 
Join Date: Jan 2012
Location: guangdong
this one is biger
Because of my poor English, only with the help of the dictionary, so pretty. Same meaning, can you guess right, I'm sorry.
Click the image to open in full size.
  Reply With Quote
Old 27th March 2013, 01:45 PM   #4042
The Dastardly Dad of Three
diyAudio Member
 
Join Date: Sep 2009
Quote:
Originally Posted by generg View Post
always interesting again....

two channels with four closely Vgs matched R125....in a constellation with a Cinemag xformer.

........thanks tea-bag really fine sound........!

would be interesting if these differences are gone with pairs better matched by a curve tracer...

of course I will do place hopping
Those look like very very tiny differences no? I am guessing it will be hard to get much closer unless the amps tested were hi fb kinds...
Also these were after trimming pots or no trim ? If latter maybe worth swapping the fets between channels to see what happens.
  Reply With Quote
Old 27th March 2013, 01:47 PM   #4043
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
@kiven chen

you need fatter traces - for power (both + and - ) , and for loudspeaker output

besides that - I hate checking even my own pcbs ....... so no help in that , from me .
__________________
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 27th March 2013, 01:47 PM   #4044
diyAudio Member
 
Join Date: Jan 2012
Location: guangdong
R8 connection on 5 C2 connection in 6, I was wrong.
  Reply With Quote
Old 27th March 2013, 01:53 PM   #4045
diyAudio Member
 
Join Date: Jan 2012
Location: guangdong
Thank you for your help, the power and speakers I will add copper on the PCB.
Because I was set on the radiator, the radiator is only 120 mm high, so I use 35 mm PCB
  Reply With Quote
Old 28th March 2013, 07:09 PM   #4046
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Next version. Choke loaded
Attached Images
File Type: jpg IMG_20130328_144258.jpg (373.4 KB, 286 views)
__________________
...Shape the sound , Man!
  Reply With Quote
Old 28th March 2013, 07:24 PM   #4047
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
Quote:
Originally Posted by kasey197 View Post
Those look like very very tiny differences no? I am guessing it will be hard to get much closer unless the amps tested were hi fb kinds...
Also these were after trimming pots or no trim ? If latter maybe worth swapping the fets between channels to see what happens.
Hi kasey,

without trimpots and 0R1 resistors....

indeed after changing the places of the SS in the channel that had k3 dominant, the situation changed and the k2 got dominant (about 6db). The other channel has a k2 dominance of 12 db.
I have the impression that the dominance of k2 or k3 is hearable, but do not fix me at which db point, 6 or 8 or 12......
With my J2 tries I dare to say that the difference of 14 or 8db k2 dominance is perceptible (to me.... ?)

the F6 excels in in a huge stage....

but what a pleasure to hear with the First Watt line so many different good sounds and amps.... I can´t stop changing.....
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 28th March 2013, 07:31 PM   #4048
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by generg View Post
the F6 excels in in a huge stage....
Its most notable feature, IMO.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 28th March 2013, 09:48 PM   #4049
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
I have a pilot run of 20 pieces for in-house use and to share with my buddies.

I simply tested the Jfets for transconductance and use that to roll the 2nd
harmonic.

  Reply With Quote
Old 28th March 2013, 11:00 PM   #4050
The Dastardly Dad of Three
diyAudio Member
 
Join Date: Sep 2009
Quote:
Originally Posted by Nelson Pass View Post
I have a pilot run of 20 pieces for in-house use and to share with my buddies.

I simply tested the Jfets for transconductance and use that to roll the 2nd
harmonic.

With the higher transconductance parts in the upper half ?
Welcome back btw ...
  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 05:29 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