One channel softer than the other, humming and buzzing - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 23rd September 2007, 05:46 PM   #1
Lloyd84 is offline Lloyd84  Australia
diyAudio Member
 
Join Date: Sep 2007
Unhappy One channel softer than the other, humming and buzzing

Hi all, I'm hoping someone can help with a problem I'm having with my amp.

I have one of these, and it has developed a fair amount of hum from both channels. The left also sounds significantly different to the right, and is much, much quieter.

Prior to this it had no hum whatsoever. BTW, this is system number two. I returned the first one because of the exact same problem, so I'm wondering if it's just a design flaw, or if I've done something to cause it?

Troubleshooting I've tried:
*Moved all speaker cables away from power cords
*Tried a different power outlet

There is also a picture of what I assume is the circuit layout on the side of the unit, if that is of any help.

Any help/ideas/random noise would be appreciated.
  Reply With Quote
Old 24th September 2007, 01:21 AM   #2
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
What are you using for input? If it is stereo via RCA jacks, swap left for right either at the amp or at the source (not both) to make sure the problem is not the source or the cable. If there is still a problem, return the unit and get your money back.
  Reply With Quote
Old 24th September 2007, 04:01 AM   #3
Lloyd84 is offline Lloyd84  Australia
diyAudio Member
 
Join Date: Sep 2007
Thanks for the suggestion. I've tried that, and the problem persists. Does anyone know what could cause this type of problem?
  Reply With Quote
Old 24th September 2007, 05:45 AM   #4
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
Poor design or poor quality control.

The link you posted stated that it is is a 15 watt per channel RMS valve amp. It also says that the "valve" (singular) is priminantly on display. I would think that with one valve only it is a dual triode pre-amp valve. The power stage will not be valve powered, so the talk of being low power because it is a valve amp is BS, the power section will probably be a solid state chip.

If this is the second unit with the same problem and you have definitely isolated the source and the cable as a not being the problem that would suggest pretty poor quality control and/or design. You should probably take it back and put your money toward something that works. If you really want a valve amp there are probably better options than this.

Good luck anyway,

Chris
  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
Forte 1a buzzing/humming fixed? needtubes Pass Labs 3 5th August 2007 04:02 PM
A quick question about humming / buzzing markiemrboo Chip Amps 40 4th December 2006 07:41 PM
T-Amp problem: one channel buzzing lanierb Class D 0 1st November 2006 05:32 PM
Humming Zen V4 Diomedian Pass Labs 4 26th April 2006 08:30 AM


New To Site? Need Help?

All times are GMT. The time now is 05:06 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