We've had a few constructive responses to our guitar hum issue that ran 2/18/98. inSync reader Mike S. reiterated several points I made and added the following: Doubling the distance from the source of the EMI can reduce the amount of hum by as much as 12db (I am sparing you guys the math behind this assertion). Shielding the device and the pickups with metal (and making sure the shield is grounded) can help by "intercepting" the induced field and draining it away, but it is best just to turn off the source if it's not absolutely needed. Also, the power source must be clean. Fluorescent lights, due to the operation of the ballast, inject a large amount of hash onto the AC line. Dimmer switches (sometimes even when you think they're off!) can also dirty up the AC. This can make its way through the amplifier or effects devices being used and cause "buzz."

Another reader, John F., reminded me of the following: Find out if the hum stops when the guitarist wraps his hand around the neck of the guitar. If it does, take a set of alligator clip test leads that are connected with a piece of wire between them. Attach one end to the bridge of the guitar and the other end to his clothing in such a way that it stays in contact with his skin.

Some readers also reminded us that there are a variety of single coil designs on the market today that do have humbucking characteristics and sound excellent. I use such a design in my guitar and they work very well.