One channel softer than the other, humming and buzzing

Lloyd84 · 23rd September 2007, 05:46 PM

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.

chrish · 24th September 2007, 01:21 AM

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.

Lloyd84 · 24th September 2007, 04:01 AM

Thanks for the suggestion

. I've tried that, and the problem persists. Does anyone know what could cause this type of problem?

chrish · 24th September 2007, 05:45 AM

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

23rd September 2007, 05:46 PM	#1
Lloyd84 diyAudio Member Join Date: Sep 2007	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.

24th September 2007, 04:01 AM	#3
Lloyd84 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?

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24th September 2007, 01:21 AM	#2
chrish diyAudio Member 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.

24th September 2007, 05:45 AM	#4
chrish diyAudio Member 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

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