Thanks for the complement on the amp. I felt like I did an adequate job assembling it, but couldn't kick that last bit of noise. Now that I'm fighting the same exact issue with another similar, simple circuit I'm questioning the source of the hum. Noise is a frustrating thing! I forgot about the free tee shirt offer with a used Foreplay preamp promotion. Seriously though....I'm missing a few tee shirts, what did it look like? ;) Was it a midget sprint car shirt? I've used a few of those for packaging. I'm glad you are having fun with the preamp and the shirt! Jerrod