I have a Epiphone les paul Standard ii (slash edition) guitar and Vox ii modeling guitar amplifier. When i connect it to power supply (position of various knobs: -volume knob-50%(in the mid position), gain 50%, bass 50 %, terrible-50%, power knob- 50% ), it produces humming + noisy sound . When i play single notes it produces something humming rounding sound like voing-voing-voing. When i touch the strings, these sounds gets minimized upto 70%. I dont have earthing/ground connection in my home. What might be the reason for this? What should i do to get rid of this problem? Thanks!
If it only makes the noise when the guitar is plugged in then as far as I know it can only be a problem with the jack lead or the guitar itself, or there cold be a lot of electromagnetic interference from something like a motorized household appliance or a lighting unit. All guitars are effected by this kind of interference to some extent - which is why the humbucker pickup was invented - but normally it is small compared to the signal. Using a compressor makes the problem worse.
The first thing I would try is to isolate the source of the interference by switching lights and appliances off one by one until you find the culprit. Also try replacing the jack lead with one of known good quality to see if this reduces or eliminates the effect. If the noise is really bad and the guitar lead is proven to be good then the next step would be to get the guitars wiring checked out by a guitar technician.