Hello from South Dakota! / Rockford Fosgate 600a4 Problem

Hello all, Just joined this site. Seems pretty legit at first glance. Surprised I haven't seen it sooner than now. Anyway, looking for anybody that can help with some repair questions on a Rockford Fosgate 600a4 mobile audio amplifier. When I purchased this amplifier ($20) I did not do any inspection of the unit and was unable to test. Oh well,m I'm the guy that enjoys the vhallenge of fixing things!!! In the event that it didn't work. Well, it worked great! But....,you knew this was coming, the gains were so terribly gouged out that they were hardly recognizable as potentiometers. I tried soldering in a set from a different amplifier ( Not RF ) and now it does not produce any sound at all. Looking for the how to and know how to figure out my issue! Any help is appreciated.
 
I currently live in Sioux Falls
To be honest I'm not sure if I would part with it or not. I guess it depends on it's value to you. To get a decent 4 channel amp today is not a cheap endeavor. Quality anymore is far and few between. Unless you're swimming in money. Not that this is top quality era, but the made in the USA portion of it says enough for me. If it never ran again, it would be unfortunate. But it'll take the right number for me to stop pursuing repair options. It's not a large number. Although I definitely want an amount that's greater than what I purchased it for. Buying it at the time was purely an investment. A good one at that!