old Parasound ZAMP - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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 3rd December 2005, 03:31 PM   #1
Senn is offline Senn  United States
diyAudio Member
Join Date: Mar 2005
Location: Northeast U.S.
Default old Parasound ZAMP

My sis gave me an old Parasound zone amplifier (ZAMP) that was sitting in a closet for years. It is in very good shape as it was barely used. I intended to use it as a headphone amp but, as soon as I incorporated it into my HT setup it caused a nasty ground loop hum all around the system.

I troubleshot the problem with the usual solutions - ground loop isolator; plugging into different outlets; cheater plugs; etc. - with no luck.

I noticed while checking the Parasound homepage that there are 2 newer versions of this amp, the V2 & V3. Both of these units have "ground lift" switches on the rear panel.

Do ya' think Parasound knew the early version of the ZAMP causes a ground loop hum and remedied it in later models? Can this amp be modded in such a way to eliminate the problem? Anybody else have any experience with this particular amp and a possible solution? Thanks in advance.
  Reply With Quote
Old 3rd December 2005, 04:06 PM   #2
anatech is offline anatech  Canada
diyAudio Moderator
anatech's Avatar
Join Date: Jun 2004
Location: Georgetown, On
Hi Senn,
The case must remain grounded to the third wire on the plug. You can interrupt the circuit ground and try a 10 or 100 ohm resistor to reconnect those two points. That should get rid of your ground loop.

  Reply With Quote
Old 3rd December 2005, 06:39 PM   #3
anatech is offline anatech  Canada
diyAudio Moderator
anatech's Avatar
Join Date: Jun 2004
Location: Georgetown, On
Hi Senn,
I have serviced many amps in the past, including Parasound, but can only speak in general terms. The chassis ground is a safety feature and must remain. Somewhere, the circuitry inside is connected to the chassis. The generally occurs as a wire coming off a "star" ground. You need an audio tech to correctly identify this point and insert some resistance to stop the circulating ground currents.
Parasound may be able to assist you by providing a technical description of what needs to be done. The description of what needs doing is fairly straight forward, the work may not be. A good audio technician should be able to do this.


In response to an email
  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
parasound HCA-1206 (Tony at Parasound.com) ostie01 Solid State 1 10th July 2012 05:24 AM
Parasound arnaudcoco Solid State 2 25th August 2005 09:48 AM
Parasound arnaudcoco Parts 0 24th August 2005 02:29 PM
'parasound' YUTK Solid State 0 2nd February 2005 11:06 AM
Parasound P/HP-850 mura Solid State 3 12th January 2005 07:09 AM

New To Site? Need Help?

All times are GMT. The time now is 01:20 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