2. amps-preamps
  3. 157716-124365

Help with Hum issues.

I need to pick your brains please:

As I am going crazy with this issue:

Everything listed is Solid State.....NO tubes.


Ok, so when I had my Onkyo Amp and pre amp connected, I had a hum in the Right Chanel. This is the same Onkyo Amp where I ended up burning the transistor and fuse because I was trying to eliminate this Hum issue.

It sounds like Vooohhhh. and it is constant.


I thought it was the Amplifier.


Now I have a Mitsubishi amp connected to a phase linear pre-amp and a separate tuner. The Left Chanel is clean and has no hum noise, when I switch the speaker wire (same speaker & wire) to the Right side I get that same hum again I was getting in the other setup.


This same hum was happening when I lived in a different city.


I don't understand what or why this is happening. I replaced components, wires, speakers, outlets where the components are plugged.  I plugged everything into one power strip, different strips, into the back of the pre-amp and made no difference.


Why do I keep getting this hum in the R side Only ?


It is driving me nuts and don't know how to get rid of it. I grounded the system every which way, it made no difference.


Would appreciate any help.


Thank you,
customersfirst
oldhvymec
5,101 posts
 
Is this an XLR, or RCA setup? I've had both make a lot of noise.
You've swapped everything out and you still have the noise?
Speakers?
Speaker wire (cable)?
Power amp?
Preamp?

I see you changed wire. Which wire, (cable) did you swap? How cheap is the cable? It's not to cheap or to long...

RCAs and XLRs the only thing I see you haven't mentioned..

They will drive you nuts... 

Regards
customersfirst OP
12 posts
 
This is all RCA cables.  Speaker wires are just regular wires.  I changed all the cables and wires and no difference.  The Hum is always in the R. side.
newbee
4,767 posts
 
I realize you have done a lot of stuff to find your problem, never the less if you haven't already done this I would highly recommend it. The easiest way to source a hum is to disconnect all of your sources from your amp. Turn the amp on - any hum? If not, then connect your next source to the amp. Any hum? Etc.  When it starts to hum you have identified the source, now you can more easily solve your problem. The problem could be in the source itself or in its connectivity (wires, wire distribution etc.)
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