HELP! Heavy feedback when laptop charger is plugged in

[CRAZY K]

Apart from the fact that any modification would void any remaining warranty, equipment is designed the way it is for a reason. The PSU is designed to match the equipment that it's sold with.

Agreed, the one thing that doesnt add up is why the hum has started suddenly.

If it was there from the day of purchase then thats easily solved---which happened with my Cortex.

But if it starts suddenly out the blue then its different, a point some people have missed.

If theres an Xmas residency to do, pay for proper professional help and get it sorted--its tax deductible--as Rob would say

CRAZY K

[sleah]

Agreed, the one thing that doesnt add up is why the hum has started suddenly.

Could be caused by a poor earth connection in an extension block or supply socket, or possibly a tarnished audio cable. Or even it was a poor connection somewhere before, that's now OK.
No point in dweling on it mate! Audio can be a funny old thing when it wants to.

Only recently setting up PA at work, I had a hum which came and went as it felt like it Probably a tarnished connection like I've mentioned.

[nigelwright7557]

Anyone got any ideas?

When gigging do you use two extension leads ?
Its possible the two extensions could be on different phases of the mains.
If possible always keep all your audio on the same extension lead.

[Excalibur]

When gigging do you use two extension leads ?
Its possible the two extensions could be on different phases of the mains.
If possible always keep all your audio on the same extension lead.

Highly unlikely if both extensions are in the same twin wall socket Nigel.

[nigelwright7557]

But possible if playing in a large hall.

[sleah]

When gigging do you use two extension leads ?
Its possible the two extensions could be on different phases of the mains.
If possible always keep all your audio on the same extension lead.

Or at least on the same phase!

Highly unlikely if both extensions are in the same twin wall socket Nigel.

LOL smart a$$

But possible if playing in a large hall.

Exactly. Especially since the abolition of the 2m rule, where sockets on different phases had to be at least 2m apart, that doesn't apply any more.
So in a relativley new build, it could be possible to find a stage mains board with say 3 twin 13a sockets on 3 different phases.