So below is my original listing. I just sold the preamp today and whilst checking the unit before I packed it up for delivery I have now discovered another fault. It seems to now have a faulty series/parallel switch for the drive channel. Not sure if this is just more dirt or the switch not making proper contact. In one of the settings it occasional sounds like its not quite making the connection but eventually does. I don't have the time to waste on this trying to fix it or find somone to repai