Chassis layout Return to article Full height copper PCB dividers provide mounting points, shielding and aid chassis rigidity. Front, back and side panels are also shielded this way as is the lid. Power supply section is also fully shielded with mild steel. Finished unit weighs in at for a pre-amplifier a fairly substantial 9kg. All the signal wiring and buffer sections are located at the rear of the unit. Emphasis is on short direct signal paths and individual earth return paths. This is a framed page so if you can't see a Contents page to the left then you need to Click Here in order to navigate this site.