I just picked up a Fisher 220T solid state receiver. One channel was out so I took it into my local repair shop and he replaced a capacitor and a transistor. It works fine except the bass is extremely pronounced. I have to turn the bass all the way down to get it to sound normal. The treble is also somewhat pronounced but it sounds fine at the 9:00 position. Is this normal for this receiver or is it in need of an overhaul?