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 25th February 2012, 01:13 PM   #11891
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 38
Send a message via Skype™ to dvb projekt
I have switched the pre amp to my audionet with 1m Nordost Tyr
and made a quick star ground modification to my psu pcb:

Click the image to open in full size.

The result:

Still a small hum in both speakers, when both interconnects are connected.

It vanished only when i short the right input...

Did anyone have additional ideas?
__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  Reply With Quote
Old 25th February 2012, 01:17 PM   #11892
udailey is offline udailey  United States
diyAudio Member
 
Join Date: Mar 2008
a wire and two alligator clips will help you find the source of the groundhog .
__________________
purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me. diyldr@gmail.com
  Reply With Quote
Old 25th February 2012, 01:23 PM   #11893
diyAudio Member
 
dvb projekt's Avatar
 
Join Date: Feb 2009
Location: Willich, Germany
Blog Entries: 38
Send a message via Skype™ to dvb projekt
Quote:
Originally Posted by udailey View Post
a wire and two alligator clips will help you find the source of the groundhog .
If it were so simple... I try to find the problem now for 3 days...

It is curious that it vanished only when i short the right input.
I disassembled the right amp pcb today to check all solder points, but everything is ok.
__________________
Reference TDA1541A DAC project PCBs / Tube-I-zator PCB / SSHV-Shunt PCB
Stock status in my Blog
  Reply With Quote
Old 25th February 2012, 02:48 PM   #11894
ichiban is offline ichiban  United States
space charged
diyAudio Member
 
ichiban's Avatar
 
Join Date: Oct 2004
Location: Tonawanda
Default Hum

dvb-projekt I don't know how your inputs are connected now, but try this. Disconnect the ground of one input and connect it to the rca ground of the opposite input. Hope that does it for you.
__________________

  Reply With Quote
Old 25th February 2012, 05:49 PM   #11895
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Concerning the 'standard' F5, what needs to change to increase the overall gain? A little more input sensitivity would be very welcome.

Has anybody done it? What values are required?
__________________
Illustrated Build Guides - Pass F4 - Pass B1 - Pass F5 - Pearl 2 - O2 HPA - Hagerman Bugle 2 - Pass Aleph J - Me at BA '13
  Reply With Quote
Old 25th February 2012, 06:13 PM   #11896
diyAudio Member
 
Bksabath's Avatar
 
Join Date: Dec 2007
Just reduce feed back resistors like Papa did on the Turbo
I going to try 75 homs instead of 50 this week
Just qick snip job as I have 3 150 in paralell
  Reply With Quote
Old 25th February 2012, 06:27 PM   #11897
labjr is offline labjr  United States
diyAudio Member
 
Join Date: Apr 2003
Location: MA
Quote:
Originally Posted by Bksabath View Post
Just reduce feed back resistors like Papa did on the Turbo
I going to try 75 homs instead of 50 this week
Just qick snip job as I have 3 150 in paralell

I think this changes the sound a bit too?
  Reply With Quote
Old 25th February 2012, 06:50 PM   #11898
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
not by much
__________________
my Papa is smarter than your Nelson !
tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb ; Papatreasure
  Reply With Quote
Old 25th February 2012, 07:04 PM   #11899
diyAudio Member
 
Join Date: Mar 2003
Location: midwest
Quote:
Originally Posted by 6L6 View Post
Concerning the 'standard' F5, what needs to change to increase the overall gain? A little more input sensitivity would be very welcome.

Has anybody done it? What values are required?
Very interested in the out come here, I'm sure several out there would like the few more dB of gain, and are just too chicken to jump, like myself! In the Turbo F-5 article, Mr Pass talks about this and changes some resistors to increase gain, would these same changes work with the standard F-5, or are they particular to the Turbo version in the article? My reading seem to make me feel this would be fine, but you could fill a battleship with what I dont know here!

Thanks,

Russellc
__________________
Pass DIY B-1, Pass DIY F-5
  Reply With Quote
Old 25th February 2012, 07:10 PM   #11900
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
just snip them and re-bias
__________________
my Papa is smarter than your Nelson !
tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb ; Papatreasure
  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
Rockford Fosgate Power 20001 bd amplifier power rating?? pachoorion Car Audio 8 8th May 2011 10:49 PM
Power transformers versus amplifier output power..what is your option? destroyer X Solid State 38 9th May 2009 05:23 PM
McIntosh Power Amplifier Power Guard johnnyrt Solid State 2 23rd August 2007 10:22 PM
Output power for a power amplifier Progg70 Solid State 33 10th September 2006 08:44 AM
Amplifier 3000 Wats Rms Power + Smps Higcht Power Bestiality MARAVILLASAUDIO Class D 1 5th November 2004 04:06 PM


New To Site? Need Help?

All times are GMT. The time now is 12:08 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