There was NO volume when a source was plugged into the guitar input jack - Just a low static hum

Constant humming, treble and bass adjustment not so good, and input for microphone not working at all

Several months later, I plugged it in, powered it up, and it sounded like an old clock radio with a horrible hum

However, after only 3-4 months of moderate (and entirely stationary) use, it has developed a HORRIBLE humming noise when the cord is plugged into the input jack.

The sound is very clean, no noticable hum when not struming, and the volume is very loud for only10 watts

Constant humming, treble and bass adjustment not so good, and input for microphone not working at all

With a little delicate jiggling of the guitar cord, the humming will stop, but after a few moments it loses the connection and again hums continuously!It appears to be a bad internal connection at the jack.

Because the Champ drives me nuts with all of its odd hums, pops, and buzzes, and because I really don't want to lay out a couple of hundred bucks right now to experiment with a bunch of different tubes, I got this amp as a quieter practice amp that I might tinker with.