Most amps are equipped with light emitting devices (LEDs) to indicate power status or channel slections, it's nothing new, majority of the amp manufacturers do include this feature, my JVM head included. The LED is located inside the power switch so every time it's switched one, the light comes on, it's that simple.But this light isn't one which offers much help when one plays facing one's amp; your guitar gets too close to the light & the humming starts. I would've thought it's rather harmless but it gets you like other light emmitting devices should (TV screens, computer monitors, ceiling lights, etc); it causes hum.
