Wireless headphones only getting sound on left side.

[plumAJP]

I have a pioneer av reciever/ amp and my sister got me a pair of sony wireless headphones for Christmas.

The headphones transmitter has a 3 5mm jack and my amp has a 6.3/6.5 mm female. I've bought an adapter from maplins today and tried them and I'm only getting sound on the left side. If I turn the volume to max I can hear the right side crackling in and out of action but at normal listening volume the right side just hums.

I can plug the headphones transmitter direct to the tv without the adapter and they work fine. So I know the headphones are good.

I've made sure the adpator is pushed in properly and the headphone cable is plugged in proper and all are snugly fitted.

What's going wrong?

[dtmpower]

The adapter has a short ?

[Ved]

Pull it out of the headphone socket a tiny bit and it'll likely start working. I remember having this and quickly took it back.

[plumAJP]

I've tried pulling both plugs out a bit and in a bit but no joy.

I've got the receipt so will take it back and swap it for another one.

[Mojocvh]

"gubbed"