Go Back   Home > Forums > Loudspeakers > Subwoofers

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 9th March 2014, 05:30 PM   #1
SS4927 is offline SS4927  Canada
diyAudio Member
 
SS4927's Avatar
 
Join Date: Dec 2013
Default i just need a simple plate amp

I went against better judgement and resaersch and ordered a plate amp because I need one, it doesn't pop during power on or off but it hums the entire time its on, at low volume its very evident. Im sending it back on monday. I would be willing to trade an sst for a hyper with dsp. I tried to buy one but it seems no vendors exist in my area.
  Reply With Quote
Old 9th March 2014, 06:08 PM   #2
sine143 is online now sine143  United States
diyAudio Member
 
Join Date: May 2010
have you tried tracking down the source of the hum? particularly by plugging it in to different circuits.

increasing input gain, and reducing the input attenuators on the plate amp itself will help too.
  Reply With Quote
Old 9th March 2014, 06:18 PM   #3
diyAudio Member
 
Join Date: May 2008
Before sending it back, test the sub with a battery-powered source only, e.g. an MP3-player, smartphone or similar. If the hum goes away, the sub in not at fault. In that case you should check the cabling and wiring of your entire system.
- Disconnect aerial cables from tuners and TVs that connect to the stereo to break possible ground loops there.
- Disconnect PCs for the same reason.
- Connect only the main amp to the sub, with the a.m. source. If it hums, try to swap the mains polarity, i.e. turn the mains plug by 180 degrees, where possible.
- Then connect other sources one by one and repeat the process.
- If hum appears only when you plug the aerials in, you need TV ground loop isolators aka sheath current filters for the aerial cables.
- All aplliances should be connected to the same mains line. Don't use different wall outlets. Connect everything to one power strip.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 9th March 2014, 07:24 PM   #4
SS4927 is offline SS4927  Canada
diyAudio Member
 
SS4927's Avatar
 
Join Date: Dec 2013
Quote:
Originally Posted by sine143 View Post
have you tried tracking down the source of the hum? particularly by plugging it in to different circuits.

increasing input gain, and reducing the input attenuators on the plate amp itself will help too.
Yes, i tried every available outlet on the lower level even one I had put in specific and half a dozen rca wires, with ground loop without i tired everything
  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
Simplified pentode Loftin-White with plate-plate feedback homeskillet Tubes / Valves 17 3rd August 2013 04:58 AM
5k plate to plate, el34 triode strapped, 400v b+ blue andry Tubes / Valves 12 27th February 2012 01:03 AM
EL84 PP using 5K plate to plate primate OPT jmillerdoc Tubes / Valves 5 9th March 2010 09:14 PM
DIY Plate Amp --> Need the Plate!!! gmikol Parts 4 17th February 2006 08:20 PM


New To Site? Need Help?

All times are GMT. The time now is 03:34 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