Hum that goes away when i plug in a guitar...

[tribi9]

But i dont have to touch it for it to go away, simply just plug in a cable or guitar and it goes away. The amp only hums when there's nothing plugged in. What could it be?

Many thx

[HeeBGB]

Are you using a grounding jack?

[tribi9]

Im using an imitation cliff jack. It has it's own eyelet ground.

[chief mushroom cloud]

accept no imitations or substitutes

[tribi9]

I hear you Chief, but that's all i could source locally. The jack itself might be the culprit then.... Crap, i dont have another Cliffake handy.

[chief mushroom cloud]

you can prob just fix that one...maybe add a wire to gnd or tweek the normalling tab

[Reeltarded]

Has to be

[HeeBGB]

Ok. Set the amp up with nothing plugged in. Make it hum and then ground the tip with an alligator clip or piece of wire. Does it still hum? If not its the jack

[tribi9]

Ok. Set the amp up with nothing plugged in. Make it hum and then ground the tip with an alligator clip or piece of wire. Does it still hum? If not its the jack

Thx so much, will get to it Saturday and report back.

[tribi9]

Ok. Set the amp up with nothing plugged in. Make it hum and then ground the tip with an alligator clip or piece of wire. Does it still hum? If not its the jack

it does go quiet when i ground the tip. So it has to be the jack then. Damn it. I do have regular jacks i can sub in tho.

thx so much for the help.

[tribi9]

So yeah, i put in an old standard jack and the amp is quiet now when nothing is plugged in.

Fuck fake Cliffs.

Pardon my language but they did cause me a lot of grief.

[Structo]

If the shunt switch on the jack doesn't short to ground when unplugged it will buzz.

We talked about the fake Cliff jacks a while back.
I contacted Cliff Inc about this counterfeit issue and they were dealing with it then.

By the way Antique Electronic Supply sells genuine Cliff products.
http://www.tubesandmore.com/

Court Rules In Favor of Cliff UK
http://www.cliffinc.com/lawsuit/index.htm

[tribi9]

Thx for the info Structo. The ones i have dont say Cliff tho. So, they're just a nameless copy.