Swapping the op-amp is the simplest mod, no solder is required, no electronic skills. Here are a few of our favorite op-amps and each shows proper orientation. The Burr Brown OPA2604 is very clear with extended highs and greater high voltage performance. The JRC4559D can lend a thicker quality to some ears. You can use any standard pinout dual op-amp in the Direct Drive. All Direct Drives have socket op-amps at birth, making this a simple operation The stock chip is a JRC4558D. A op-amp puller can be purchased at radio Shack or you can use you fingernails if you are very carefull not to bend the pins. Notice the orientation dots on the upper left hand sid eof the JRC chips, the Burr Brown has a marker in the upper center, make sure these marks are facing the proper direction...thats all!