Hello, I have an ID core 100. It powers on, but I get no sound. I was able to plug the guitar into the effects return and get sound, but nothing when i plug into the guitar input. any ideas? Thank you.

Hi, my son has a Fender BXR 200 head, which is making a loud buzz noise when turned on. I got it to work once, no idea how but now all it will do is BUZZ.
It almost sounds like when you  unplug a guitar and touch the tip of the guitar cable but LOUD. Volume control makes no difference.
So far I have tried:
A different speaker cab.
Different speaker cable.
Different guitar, and cable.
Turned all the controls up and down.
Patch cable between effects send and return.
Plugged in a footswitch.
Next I am going to take it apart and clean the pots, and look for signs of anything damaged or burnt.
Anyone got any ideas? Thanks.

My son's line6 spider 120 makes a bunch of crackly noise when playing. He showed me that if you give it a slap on the top near the handle, it goes away.  I played it today for a couple hours, and it's a pretty good sounding amp. It would be a lot more useful without all that noise. Any ideas? Thanks.

Hi. My son just got an Ampeg 2-12 amp with chorus for free, I think it is a 140c. Nice amp, sounds pretty good. It seems to have been sitting for a long time. It's got some dirty pots, which I can take care of no problem. The only thing I can find wrong with it is that the reverb is not working. When i turn the reverb knob, the volume goes down, and there is no reverb. The reverb tank is plugged in. Not sure where to go from here.

Quick question. How critical is it to match the impedence on a solid state amp? I always make sure I do it on tube amps. The reason I ask is that there's a 50 watt 2x12 combo where I rehearse and there is a hole in one speaker. I was wondering if I would cause any damage by just unplugging the bad speaker.