F6 Amplifier - Page 4 - 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 23rd July 2012, 06:28 AM   #31
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by tiefbassuebertr View Post
What disadvantages are to be expected by the use of a single ended input driver stages instead the here showed push-pull jFET version?
the only disadvantage that comes to me in mind is the more difficult design for the driving transformer cause present dc voltage bias.
But what about a small signal circlotron push pull input stage?
  Reply With Quote
Old 23rd July 2012, 07:22 AM   #32
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
The combination of the Semisouth I heard in BBA-1 and Aleph-J and and interstage transformer like in Magma ( F4+transformer, similar to M2)
could combine the best of two worlds and really be a dream......!
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 23rd July 2012, 08:16 AM   #33
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by generg View Post
The combination of the Semisouth I heard in BBA-1 and Aleph-J and and interstage transformer like in Magma ( F4+transformer, similar to M2)
could combine the best of two worlds and really be a dream......!
I don't know the martked devices. Google provides no helpful results in combination with "Firstwatt"

BTW - concerning interstage resp. driver transformer I have found this old paper:
http://www.freepatentsonline.com/3142807.pdf
and
http://www.sanshinechina.com/eng/sho...p?id=351&pid=8
http://www.geofex.com/article_folder...mp/voxprot.htm
http://www.scribd.com/doc/50982632/0...ull-amplifiers
(design of audio transformers)

Is
http://www.sowter.co.uk/#
a good choice for this kind of transformers?

Last edited by tiefbassuebertr; 23rd July 2012 at 08:33 AM.
  Reply With Quote
Old 23rd July 2012, 10:56 AM   #34
Vix is offline Vix  Yugoslavia
diyAudio Member
 
Vix's Avatar
 
Join Date: Nov 2003
Location: Somewhere on Planet Earth
Well, I must confess that I like transformers...and this amp is a step closer to a Magnetic amp...
I bet that ZM had to console himself by a stone BBQ...
Me..naah...moving amps and speakers..fighting for their (my) place...
  Reply With Quote
Old 23rd July 2012, 11:33 AM   #35
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
Quote:
Originally Posted by tiefbassuebertr View Post
I don't know the martked devices. Google provides no helpful results in combination with "Firstwatt"

BTW - concerning interstage resp. driver transformer I have found this old paper:
Biasing means for transistorized amplifiers
and
Sanshine (Xiamen) Electronics Co.,Ltd
Thomas Vox Solid State Amps
0.5, ... 4 push-pull amplifiers
(design of audio transformers)

Is
SOWTER AUDIO TRANSFORMERS
a good choice for this kind of transformers?

Hallo tiefbass,

kleine Fehler....small errors, of course I meant Burning Amp-1, sprich BA-1, I was confused by BBA-3!

and the Magma was a nice try to combine F4 and an autoformer, to have a M2 like combination without feedback......

Introducing the MAGMA front end for BA-2 and F4

audio rob used a Jensen Transformer JT-13K7-A and published some data...

Gerd
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 23rd July 2012, 12:42 PM   #36
Banned
 
Join Date: Nov 2006
Holy cow.
  Reply With Quote
Old 23rd July 2012, 12:51 PM   #37
Banned
 
Join Date: Nov 2006
Quote:
Originally Posted by generg View Post
The combination of the Semisouth I heard in BBA-1 and Aleph-J and and interstage transformer like in Magma ( F4+transformer, similar to M2)
could combine the best of two worlds and really be a dream......!
Hey generg.
Have you listened to the BA1, actually more importantly have you listened to the Balanced BA1 in isolation to the front end, using semisouth on output?
That is my next plan, along with this F6, and Balanced BA3.

I now no longer need gain, so my gut keeps telling me to go with balanced single ended source follower (ie power buffer) or source follower circlotron.

I am falling behind now. There are so many ideas to try.
I love this F6 schematic.

Last edited by Melon Head; 23rd July 2012 at 12:53 PM.
  Reply With Quote
Old 23rd July 2012, 02:52 PM   #38
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Quote:
Originally Posted by Antoinel View Post
Mr. Pass. Thank you for replying. The secondary windings [phase circles] as shown confused me. When the upper winding has a rising positive signal, the upper FET turns on. Simultaneously the lower FET has a matching negative signal to turn it off. Is this an approach similar to OTL [output transformerless] from the past; with identical polarity semiconductors. Then, audiophiles grumbled about an output transformer[phase abberations]; so the interstage one was kept as a compromise [and also absent complemetary devices] because it is inherently higher fidelity. I may have past articles from Radio and Popular Electronics on OTL topology.
Found an article on OTL. Please find attached in this thread and continued in the following one.
Attached Files
File Type: pdf OTLAmp1.pdf (114.0 KB, 417 views)
  Reply With Quote
Old 23rd July 2012, 02:56 PM   #39
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Page 2 of OTLAmp1 from the above thread is continued in this attachment.
Attached Files
File Type: pdf OTLAmp1contd.pdf (97.6 KB, 282 views)
  Reply With Quote
Old 23rd July 2012, 03:00 PM   #40
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
that's boiled water - xformer working as phase splitting device

no use of choking the thread with examples
__________________
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

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 04:48 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