Would removing the LEDs in my F4 or any FW amplifier yield better sound? - 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
Reply
 
Thread Tools Search this Thread
Old 15th December 2012, 01:27 PM   #1
diyAudio Member
 
Join Date: Mar 2006
Location: San Juan
Default Would removing the LEDs in my F4 or any FW amplifier yield better sound?

there is a proposal by tweak audio to do this among other tweaks and was wondering if anyone had experimented with this. maybe installing a small film cap across the led would make the same difference, thanks
  Reply With Quote
Old 15th December 2012, 02:09 PM   #2
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Temporary Alicante, Spain
Blog Entries: 7
What would be the mechanism that this could be the case?

jan
__________________
Whether we like to think of it this way or not, an audio engineer shares the professional goal of a magician - Richard Heyser
Check out Linear Audio!
  Reply With Quote
Old 15th December 2012, 02:24 PM   #3
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 2
Quote:
Originally Posted by Manolo47 View Post
there is a proposal by tweak audio to do this among other tweaks and was wondering if anyone had experimented with this. maybe installing a small film cap across the led would make the same difference, thanks
A forward biased LED is probably quieter than any of the transistors or resistors in the circuit. The impedance is low enough that a film cap bypass does nothing other than cost money and take up space. There may be psychological benefits, but any electronic ones are dubious.
__________________
A philosopher is a blind man in a dark room looking for a black cat that isn't there. A theologian is the man who finds it. - Mencken
  Reply With Quote
Old 15th December 2012, 02:40 PM   #4
Zen Mod is online now Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
YES !!!!!!!!!!!

it will sound brighter , because every LED is stealing brightness* from amp!

*that's the reason why I'm always puttin' several LEDs in my projects - brightness setting mechanismus
__________________
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 15th December 2012, 04:16 PM   #5
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Apropos of the subject, when I first made FW amps with the blue LEDs, I
ran them at a couple ma current and they were fairly bright. This resulted
in comments about the high frequencies which went away when I dimmed
them down. Similarly, red and green LEDs elicit different perception of the
sound in a number of customers.

  Reply With Quote
Old 15th December 2012, 04:18 PM   #6
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
I can't decide whether to chuckle or dim my Led's. I love it
__________________
...Shape the sound , Man!
  Reply With Quote
Old 15th December 2012, 05:34 PM   #7
diyAudio Member
 
Join Date: Mar 2003
Location: midwest
Finally! Something I dont have to worry about! I still havent installed the leds!
What a lazy *** I can be.

Russellc
__________________
Pass B-1 preamp, Pass F-5 Amp, Pass F-6 Amp, Pass BA-3 Preamp, Pass BA-3 Amp, Pass Pearl 2 Phono
  Reply With Quote
Old 15th December 2012, 11:26 PM   #8
diyAudio Member
 
HIPCHECK's Avatar
 
Join Date: Jun 2004
Location: ARKANSAS
Waiting on the following line being added to Pass DIY site on F4:

of course feel free to use what ever "audiophile grade" led you choose in your designs.
__________________
If a inch of duct tape will fix it, 3 feet should fix it for life!!!!
  Reply With Quote
Old 15th December 2012, 11:33 PM   #9
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
In defense of the OP, if you brought this topic up in the Curl thread, you might get different opinions.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 15th December 2012, 11:43 PM   #10
diyAudio Member
 
MEGA_amp's Avatar
 
Join Date: Oct 2003
everyone knows or should know that cryogenically treated quantum purified LEDs are the quietest.
  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
Is the F4 the most-suitable FW amp for me? jeffreybehr Pass Labs 21 21st February 2011 08:01 AM
removing sound controlls... trigger Tubes / Valves 24 16th January 2010 02:53 AM
2SA1837/2SC4793 Matching Yield? jkeny Solid State 1 5th January 2009 02:10 PM
sound sensitive LEDs JoeKnowsBasebal Car Audio 5 19th November 2007 11:39 AM
Removing LEDs from chinese amp woodturner-fran Tubes / Valves 4 2nd December 2006 04:57 PM


New To Site? Need Help?

All times are GMT. The time now is 09:26 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki