AMPEG BA115T PROBLEM!! ANY HELP?

[basetendencies]

I BOUGHT AN AMPEG BA115T USED RECENTLY, THERE WAS A MEDIUM PITCH CRACKLING ELECTRIC FUZZ SOUND COMING OUT OF THE TWEETER WHEN I PLAYED, SO I REPLACED THE TWEETER, AND SAME THING THERE, SO IM WONDERING IF ANYONE KNOWS WHAT IT MIGHT BE. IT'S NOT THE COMMON TWEETER HISS, ITS SOMETHING COMPLETELY DIFFERENT. THE BEST WAY TO DESCRIBE THE SOUND IS LIKE AN ELECTRIC FUZZ CRACKLE. IT SEEMS TO HAPPEN AS SOON AS I RAISE THE MASTER KNOB ABOVE 1 NO MATTER THE OTHER SETTINGS, AND THERES A CRACKLING SOUND WHEN I MOVE THE MASTER VOLUME KNOB.
I WOULD APPRECIATE ANY HELP BEFORE I DECIDE TO PAY TO GET IT CHECKED OUT. THANK YOU.

 

[Batmensch]

Dude! Quit shouting. It's rude.
Anyway, is the noise constant when you raise the volume, or does it only happen when you are actually manipulating the knob? Might be a bad pot.

 

[basetendencies]

The noise from the tweeter happens when i play any note, it gets worse the harder i pluck the string, and as far as the master knob problem goes, it makes a slight crackling only when i move it around, usually between the first 5 notches. Also i forgot to mention in the post that when i turn the amp off, theres like a thumping pop sound, and if i switch it back on a second later, theres a hollow tube thump type sound. I dont know if thats related, but it doesnt sound normal either.

 

[craig.p]

Re. the shouting, he could simply be an old COBOL programmer like me!

Anyway, first thing I'd do is pull the head and spray cleaner/lube into the pots, because they could simply be dirty. While you're in there, check for any loose/corroded connections. What I usually do is remove and reinstall every internal power and signal plug I can find. Sometimes they can get corroded. I've even seen some that weren't installed right in the first place. You could also have a problem with a broken circuit board trace (aka "etch"), or a cold solder joint in the process of letting go, either of which would be exacerbated by vibration. You need a magnifying glass and lots of patience to spot those. Or you can use a nonconductive "poker" such as a wooden chopstick to push on internal parts of the amp while you're playing through it. (Obviously you have to run the amp outside its case for this.)

 

[basetendencies]

Ill definitely try that out soon. My local music stores are horrible, guitar center said it was a blown tweeter, which it wasnt, and the other 2 places didnt seem to be of much help either. So, ill try and open it up and test some things out before i have to pay to get it looked at. I really appreciate the help, thanks.