1. What's pickup? Pickup is just like microphone, microphone is suitable for human vocal, and musical instrument has its own specialized microphone, called pickup 2. What's function of the pickup? The role of pickup is to put instrument's sound transfer to musical instrument or mixer, released by the speaker to make the sounds louder. 3. Why does a guitar hum if standing by an amp but hums less when you turn to a different direct? The hum you hear in your amplifier is usually caused by stray magnetic fields generated from the output and power transformers in your amplifier. It is commonly called 60 cycle hum and is one of the major problems that occur with single coil pickups.
eBay