Benefits/Drawbacks of Dual rails vs Single Rails - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 25th May 2011, 10:51 AM   #1
diyAudio Member
buzzforb's Avatar
Join Date: Oct 2010
Location: Burlington, NC
Default Benefits/Drawbacks of Dual rails vs Single Rails

Getting ready to assemble F3 and have looked at other possible layouts and do not yet know the benefits and drawbacks of single vs. dual rails. I was hoping someone might have some comments about each with positive and negative aspects. Although the Zen articles contain mostly single rails, dual rails are used in most of the more advanced offerings, so i figured there was a reason and i am not exactly sure why.
  Reply With Quote
Old 25th May 2011, 11:09 AM   #2
flg is offline flg  United States
diyAudio Member
flg's Avatar
Join Date: Jul 2005
Location: North East
In the case of F3, the JFET biasing and input refrenced to Gnd are well suited to a single rail supply. It would be difficult and need more parts, possibly even another stage to try to run the F3 on a split rail supply. You would possibly be able to omit the output cap in that case but, I doubt the benifit would be worth the extra components.
The omision of a large output cap is ussually considered a big benifit of the split rail supply designs (F4). In only a single stage amp it is difficult to have a Gnd refrenced input and an output that swings + and - without a cap somewhere.
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
  Reply With Quote
Old 25th May 2011, 01:06 PM   #3
h_a is offline h_a  Europe
diyAudio Member
h_a's Avatar
Join Date: Sep 2006
Location: Graz, Austria
Ah, the F3! Really a nice circuit!

Enjoy and don't worry about the big cap!

High Octane phono preamp Wiki
  Reply With Quote


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
ucd700hg rails. back Class D 0 13th May 2008 03:43 PM
Single ended classA with dual supply rails boxedin Solid State 9 11th January 2006 10:02 PM
filament rails resident Tubes / Valves 2 22nd October 2004 12:48 PM
Cap across rails? MikeW Pass Labs 12 24th August 2004 01:35 PM
AV800 rails Anvil Solid State 10 12th June 2004 02:34 PM

New To Site? Need Help?

All times are GMT. The time now is 06:48 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Đ1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2