Aleph 5 100Hz problem - Page 2 - 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 6th April 2004, 08:59 PM   #11
piewie is offline piewie  Belgium
diyAudio Member
Join Date: Jan 2003
Location: at home :)
i still have got a slight humm when both amplifiers are switched on and connected to the same source. How could i best solve this.
No hum whatsoever with only one channel switched on.
  Reply With Quote
Old 6th April 2004, 09:54 PM   #12
diyAudio Member
Holger Barske's Avatar
Join Date: Jan 2001
Location: Ruhrgebiet
Sounds like a ground loop effect.
Both amps connected to the same wall mains outlet?
Best regards: Holger
  Reply With Quote
Old 6th April 2004, 10:07 PM   #13
piewie is offline piewie  Belgium
diyAudio Member
Join Date: Jan 2003
Location: at home :)
both are indeed connected to the same outlet and are grounded.
It is indeed a grounding problem, question is how will i solve this.
I still have 4 VDR's laying around. Would it be wise to connect the supply gnd with these to the starground of the monoblocks.


* operating voltage:
o Vac: 50V
o Vdc: 65V
* type: S20K
* dimensions:
o D: 22.5mm
o T: 4.5 .. 5.3mm
o d: 1.0mm
* pitch:
o e: 10mm
* response time: < 25ns (< 10ns with SMD varistors)
* electric strength: 2.5kV
* insulation resistance: > 1Gohm
  Reply With Quote
Old 7th April 2004, 12:51 PM   #14
piewie is offline piewie  Belgium
diyAudio Member
Join Date: Jan 2003
Location: at home :)
Solved the problem with inserting a 5W 100ohm resistor between star ground and ac gnd connection of one monoblock. Now the ground loop has disappeared.

picture of finished project.
I'll anodise them later

Click the image to open in full size.
  Reply With Quote
Old 7th April 2004, 01:43 PM   #15
diyAudio Member
Alain Dupont's Avatar
Join Date: Sep 2003
Location: Paris - France

Great job, nice pair...

  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
Using SS to augment < 100Hz? bigwill Tubes / Valves 3 25th January 2009 05:13 PM
Which Driver to use for 100hz-500hz? KCCT82 Multi-Way 27 6th January 2008 03:59 PM
How to kill a 100Hz open baffle resonance? Katapum Full Range 12 22nd November 2005 03:51 PM
subwoofer/woofer to go up to 80-100hz? Guijs Subwoofers 2 24th October 2005 08:23 PM
question on rolloff below 100Hz wintermute Chip Amps 4 16th December 2003 03:23 AM

New To Site? Need Help?

All times are GMT. The time now is 05:28 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2