Positive Grid Spark 40 Guitar Amplifier - Opened Box. Brilliant machine but have decided to splash out on new acoustic guitar instead. The item "Positive Grid Spark 40 Guitar Amplifier Opened Box" is in sale since Wednesday, September 22, 2021.This item is in the category "Musical Instruments\Guitars & Basses\Guitar Amplifiers". The seller is "redshoes0_0" and is located in Wetherby. This item can be shipped to United Kingdom.