F6 Amplifier - Page 526 - 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 30th August 2013, 04:02 PM   #5251
diyAudio Member
 
Join Date: Oct 2010
Quote:
Originally Posted by Zen Mod View Post
pcbs - TeaBag and Buzzforb are right to ask
SJEP outputs - Semisouthfan
if you want some other outputs - ask those guys when asking for pcbs
Thanks!! I will post an update once I track these down.
  Reply With Quote
Old 1st September 2013, 09:19 PM   #5252
diyAudio Member
 
Join Date: Dec 2012
Location: Starkville, Mississippi, USA
As astutely pointed out by Generg, it is both (i.e., stash + professionally equipped lab). You have to start with a big pile of parts to sort it down into small piles of matched parts. But I've been learning on the job. The real thanks goes to our German friends who have been rather exacting in their requests and generous with the results (aka dsdjoy, post #5149).

For those that are flexible on the part number, the size of the inventory needed to do the job of close matching of both the dc operating point (Vgs) and the ac reproduction (transconductance approximately, but really the shape of the transfer curve to be exact) is still available. Email michael.mazzola@impowersystems.com to learn more.

Quote:
Originally Posted by generg View Post
Ask him how big the stash is...

But what I can say that his matching quality is superb, not only Vgs, but shape of the transfer curve, means transconductance etc. included, he simply has a very expensive curve tracer.

Look at the experience of dsdjoy here some pages back..
How long he can offer this quality of matching, I do not know.....
  Reply With Quote
Old 1st September 2013, 09:22 PM   #5253
diyAudio Member
 
Join Date: Dec 2012
Location: Starkville, Mississippi, USA
Awww, that's so nice!

I love this guy. I really do.

Quote:
Originally Posted by Zen Mod View Post
ask him

however - he's more Semisouthpa than Semisouthfan

  Reply With Quote
Old 7th September 2013, 08:20 PM   #5254
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
Hi F6 builders....!

Two friends of mine adjusted the 1.2 V at the SemiSouth from source to gate and...the Semisouth got not warm, means no bias through them.
I encouraged them to turn the bias pot more and to measure the real current through an ampere meter.
The Vgs threshold of the SS is so different that the 1.2V are not always the right value.
I have seen in the curve tracer SS starting at 0.7V (out of spec) and other around 1.8V

So measure the real current, of course you can insert a small resistor in the neg or pos rail like Nelson in the 6moon version. 0R1 is a possible value and turn the pot unti you see 150mV over it for the 1.5A wanted.

Good luck and do not give up turning!
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 7th September 2013, 09:24 PM   #5255
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
And I forgot...

When you use IRF instead of SS the 1.2V value is not valid, because the IRF has a much larger Vgs threshold around 4V.
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 10th September 2013, 07:09 AM   #5256
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Anyone tried the difference of resistors vs spool (bad english?)in the powersupply,that is difference in sound.
__________________
Regards Åke
  Reply With Quote
Old 10th September 2013, 07:17 AM   #5257
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
Or even the difference with regulated supply..?
__________________
Regards Åke
  Reply With Quote
Old 10th September 2013, 02:12 PM   #5258
diyAudio Member
 
Join Date: Jan 2012
Location: guangdong
my F6 use 2SK1058
Click the image to open in full size.
  Reply With Quote
Old 11th September 2013, 04:09 PM   #5259
Ryssen is offline Ryssen  Sweden
diyAudio Member
 
Ryssen's Avatar
 
Join Date: Dec 2003
Location: Sweden--> Here
How much is the current draw of one channel,at max outputpower?
__________________
Regards Åke
  Reply With Quote
Old 14th September 2013, 06:37 PM   #5260
diyAudio Member
 
Join Date: Jan 2012
Location: guangdong
My new F6


Click the image to open in full size.
  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 12:11 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