The Little Black Amp Box is a passive volume control for a tube amp's series effects loop. Run in the loop, it sets how much signal reaches the power section, so you can push the front end of the amp as hard as you like and keep the room at bedroom volume. It needs no power supply.
It is for series loops only. JHS is clear that it will not give the intended result in a parallel loop, and that it must never go between the amp's power section and the speakers, which will damage your gear. JHS also advises against running other pedals in the same loop with it, because it changes how they sound, though it will not harm them.
It shares the small black housing of the Little Black Buffer, compact enough to sit on top of the amp or mount under a pedalboard. Built in Kansas City.
SPECIFICATIONS
SPECS
Country of Origin: United States
Type: Passive volume utility
Placement: series effects loop only; not for parallel loops; never between the power section and the speakers
FEATURES
Mounting: fits under a pedalboard or on top of the amp
Finish: Black powder coat
POWER
Power: Not required (passive)
DIMENSIONS
Dimensions: 3.6" x 1.5" x 1"



