F5X -- the EUVL Approach - Page 2 - 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 18th February 2011, 04:51 AM   #11
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Fitzfish ordered the Tx and dealt with all the questions. So you should ask him for the details. I did not know of those questions at all.

But this is the first time I had a Tx manufacturer worrying about bifilar winding in the secondary which is 16Vrms. You can have secondaries on top of each other with insulation in between. There is probably a slight difference in output voltage which the regulator should take care of.

Class B lead wire is better insulation than Class A, but I do not recall specifying Class A anywhere other than minimum insulation voltage.

But the proto-transformers have a SumR number. I no longer have the details. Please do not hesistate to contact fitzfish for that. I am sure he is more than willing to help.


Patrick
  Reply With Quote
Old 18th February 2011, 05:42 AM   #12
Banned
 
Join Date: Nov 2006
Nice work Patrick.
If you still need my help please let me know
  Reply With Quote
Old 18th February 2011, 07:29 AM   #13
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
thanks Patrick, i'll follow up with fitzfish and see if he had the same query. good that we have an item number with him.

Last edited by qusp; 18th February 2011 at 07:32 AM.
  Reply With Quote
Old 18th February 2011, 07:30 AM   #14
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
> If you still need my help please let me know

How about spicing the version with 2SK3497 / 2SJ618 as output devices, with an aim to minimise 3rd & 5th ?

Patrick
  Reply With Quote
Old 18th February 2011, 07:51 AM   #15
Banned
 
Join Date: Nov 2006
I don't think I have those models. Do you have them?
  Reply With Quote
Old 18th February 2011, 07:54 AM   #16
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
Toshiba Power Mosfets 2SK3497/2SJ618 - A little testing
  Reply With Quote
Old 18th February 2011, 08:07 AM   #17
Banned
 
Join Date: Nov 2006
Thanks
I will make a start tonight
  Reply With Quote
Old 19th February 2011, 05:56 AM   #19
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
One more point I wish to add.

There is a wealth of information that I already published at the F5 thread and the balanced F5 thread.

You can find these at :

diyAudio - Search Results
diyAudio - Search Results

I don't know how long these links will be valid.
But you can just go to the specific thread, use the "advanced search" option of "search this thread", and type EUVL in the "User Name" box on the top right hand corner, and you will get the same search results.


And I forgot one test which will come at the end -- using 2SK389 and 2SJ109 as front end devices. They are better complementary devices than 2SK170 / 2SJ74, so the circuit tuning will differ slightly. Unfortunately there are only a few lucky ones who still have some of them. So that is why it does not get a higher priority.

The PCB naturally supports the pin layout of the dual JFETs as well.


Patrick
  Reply With Quote
Old 19th February 2011, 07:37 AM   #20
diyAudio Member
 
Join Date: Jun 2006
Patrick

I remember that at first you were planning stereo balanced amp at only one box
now as the project will be at mono boxes can we turn more power In respect to output devices - can they work at 45 - 50 W
MF35 - 151.5 heatsinks can dissipate more than 75 W
If someone would not use regulator - the rails will be higher and will get more power
  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



New To Site? Need Help?

All times are GMT. The time now is 11:37 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