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
 
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.
customersfirst OP
12 posts
 
It is NOT the tuner.  If you read my post, different sources have been tried.  The hum is always there.
newbee
4,767 posts
 
OK. Did you try what I suggested?  What happened?  That always works for me when I'm trying to source a problem.
customersfirst OP
12 posts
 
Ok, I did that again and here is what happened:

Disconnected everything.

Plugged the Amp in with speaker attached.  No hum.

Plugged pre amp and attached it to Amp.  When I turned on the pre-amp the hum is back.

All is plugged into the same power strip.

My understanding is that I would not get a hum anyway by just plugging in the Amp since it needs a pre-amp to do anything.

So I doubt it is the pr-amp that is causing the hum.

Again...I was using a different pre-amp and amp before and I was still getting the SAME hum in the Right side....no matter what speaker or wire I used.
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