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
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.)
twoleftears's avatar
twoleftears
5,318 posts
 

Is the hum emanating from the amp or from the speakers or both?

Same speakers as previous house?

Does it move to the other speakers if you hook the left speaker wires to the right-side amp output?

customersfirst OP
12 posts
 
Without a speaker connected to the right side of the pre amp there is no hum.  The hum does not come on by turning the amp or pre amp on if there is no speaker connected.

It is not the speaker because I tried different spekrs and wires.  It is not the equipment because I tried different setup/equipment and still have the hum in the R. side.
customersfirst OP
12 posts
 
Sorry I meant the spkrs connected to the Amp.
newbee
4,767 posts
 
Following up on my post, your speakers should be connected when you start with my suggestion.

1) First connect ONLY the amp and speakers. Turn on. No hum then on to step 2)

2) Add pre-amp with no sources connected, such as your tuner, phono, etc, connected do the pre-amp. Turn on. No hum then add your sources, one at a time, starting with the tuner. You should find a hum in one of these sources. Just a WAG, but I suspect you have a tuner with a bummer R channel.
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