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

Showing 2 responses by rixthetrick

rixthetrick's avatar
rixthetrick
1,060 posts
 
Do you have a competent electronics repair service in your area, especially a service agent for reputable hifi brands?
Perhaps you could get on Google and look for one, especially if you're in a highly populated area.

A good service agent should be able to with the correct tools identify the problem and give you ideas on costing to repair the device/s
rixthetrick's avatar
rixthetrick
1,060 posts
 
Cold solder joints of Amplifier might cause a 50-60Hz hum.

If after all of the suggestions here are exhausted, with the amplifier unplugged and cooled down, carefully with a multi-meter check the resistance on the left side and right side channel inputs. Between signal and grounds, dry solder or cold solder joints can create hum issues. You could also Ohm it out, check resistance between the input contact and the solder joint on the next solder joint past where the connector is soldered to ensure continuity, and also Ohm to ground. I only suggest inputs because they are physically stressed by installing and removal of connectors.

This isn't fun, it takes a bit of time to pull it down and check it. I am only suggesting the input as it's easier than say a filter cap, or one along signal path. Do you know if it has a separate power supply for each channel in the amplifier?

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