So you input rack preamps directly into the unit. The second: it has a Jensen Transformer and it op-amp driving circuit installed. This is for to balance the effect "Send" port. In good shape, some slightly scratchy pots. Download a pdf manual for further specs.This item is in the category "Musical Instruments & Gear\Guitars & Basses\Guitar Amplifiers". The seller is "broadcast-video" and is located in this country: US. This item can be shipped to United States, Canada.