metal rca gone from my pre amp

[jamesbond007]

hi i have the SHERWOOD RD-8108R receiver on my pre amp out put i have no metal rca just a black cap is this why i would be getting hum from my sub.how would i fix this thank you

 

[jamesbond007]

the black 1 is my pre amp when i just use 1 rca from my sub i get a humming sound from sub is it because i have no metal on my pre amp if so how would i fix this thank u

 

[dante01]

is it because i have no metal on my pre amp if so how would i fix this

Yes.

The metal provides the grounding.

Either buy a new RCA input and replace the damaged one yourself or have someone repair it.

 

[Ian Dudley]

Yes.

The metal provides the grounding.

Either buy a new RCA input and replace the damaged one yourself or have someone repair it.

Does that mean that the outer part of an RCA connection plug is a 'common ground'.

The reason I ask is that I just had 2x 3-way RCA cables delivered to use for the multi-channel in on my amp, and have found that the metal jackets on the plug (which look to be electrically common with the outer part of the connector) are so bulky that when they are all plugged in together they can touch each other.

If they are just common ground though, then it shouldn't matter?

 

[dante01]

Does that mean that the outer part of an RCA connection plug is a 'common ground'.

The reason I ask is that I just had 2x 3-way RCA cables delivered to use for the multi-channel in on my amp, and have found that the metal jackets on the plug (which look to be electrically common with the outer part of the connector) are so bulky that when they are all plugged in together they can touch each other.

If they are just common ground though, then it shouldn't matter?

Yes, the grounds would be common. In fact, if a ground isn't common, you are more likely to suffer humming. You usually get a hum when two component have independent grounding rather than sharing the same mains earthing circuit.

 

[jamesbond007]

will this work its the metal bit from another rca input

 

[dante01]

will this work its the metal bit from another rca input

It may, but ensure it makes secure contact with the receiver's metal casing or the back-plate.

 

[jamesbond007]

thank you im putting my amp back together now lol

 

[jamesbond007]

it is all working now i am just using my sub woofer cable and y splitter rca with 3.5 mm but if i put the cable in the red 1 on the splitter going into my sub the sound is a bit loader.i thought sub was mono so is it safe to use the red 1 or should i use the white 1.i am using pc speakers the 1 i am using on my sub is orange it says center and sub under it thank you