ADS PQ20 - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 22nd April 2011, 05:00 PM   #1
diyAudio Member
 
Join Date: Sep 2006
Default ADS PQ20

Im starting a new thread on this amp since the last thread says it was closed.

I got the amp to power up and stay powerd up now the amp had a blown trace on the output board.

The amp plays But there are a couple of problems.

1ST problem: when listing to the amp it sounds like the music has an echo to it.

2ND problem: I can hear a hum through all speakers connected to the amp with and without volume.

Any ideas?
  Reply With Quote
Old 22nd April 2011, 05:05 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Does it hum with no RCAs connected?

Is the signal source ground tied to the amp ground?
  Reply With Quote
Old 22nd April 2011, 07:37 PM   #3
diyAudio Member
 
Join Date: Sep 2006
It hums with no rca's plugged in.

Signal source ground Do you mean the rca shields?
  Reply With Quote
Old 22nd April 2011, 09:28 PM   #4
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Yes if it's a portable player. If it's a head unit, the ground for the head unit would be the signal source ground.
  Reply With Quote
Old 10th May 2011, 05:16 AM   #5
diyAudio Member
 
Join Date: Sep 2006
Ok back to this amp.Im going throught the entire amp top to bottom to get it to sound like brand new again.

Not sure what year this amp was made but wondering if it is a good idea to replace the caps in this amp due to age. If so wondering who makes the best caps out there? When i get this amp done i want it to be pure sound quality
  Reply With Quote
Old 10th May 2011, 05:24 AM   #6
diyAudio Member
 
seankane's Avatar
 
Join Date: May 2010
Location: Washington State
Nichicon Muse are very nice caps to use.
__________________
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch
  Reply With Quote
Old 10th May 2011, 05:37 AM   #7
diyAudio Member
 
Join Date: Sep 2006
Cool thanks. Still wondering if there is a even better brand out there? I wanna rebuild this amp from the bottom up. Im looking to get the best sound out of it as possible
  Reply With Quote
Old 10th May 2011, 05:44 AM   #8
diyAudio Member
 
Join Date: Sep 2006
Wondering If anyone has opinions on the Panasonic FC series caps?
  Reply With Quote
Old 10th May 2011, 03:55 PM   #9
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
FC series caps are a good choice for power supplies. They can take more abuse than many capacitors. In this amp, there aren't any capacitors that will be under any real stress. Virtually any capacitor within spec will work. Assuming that all caps meet spec, using expensive capacitors or cheap capacitors won't make a difference in the sound quality.
  Reply With Quote
Old 18th May 2011, 04:58 AM   #10
diyAudio Member
 
Join Date: Sep 2006
Im working on this amp still while waiting for parts for other amps.

Im almost done rebuilding the power supply section of this amp then its off to the output section.

My question is if 1 of the UPC1270H's are bad in this amp would that cause the humming through the speakers or cause the music to echo??
  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
ADS PQ20 mike49504 Car Audio 2 19th April 2011 04:47 AM
ADS a/d/s Braun PQ20 with no output gisewhcs Car Audio 3 21st September 2010 01:45 PM
Wanted: A/d/s/ Pq20 Jonny Hotnuts Swap Meet 2 4th January 2008 08:58 AM
ads pq20 mike49504 Car Audio 3 8th August 2007 02:11 AM
ADS PQ20 amp- anyone worked on? GordonW Car Audio 1 24th March 2007 09:14 PM


New To Site? Need Help?

All times are GMT. The time now is 06:11 PM.


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