Nice rig. I just bought a DSL20RH and run it into a Marshall 1965A cab. I'm getting a noise unlike I've ever heard from an amp - it's as if a live microphone placed outdoors was picking up constant wind noise. That happens once the amp is off standby, in either power mode and with no cable in the amp's input and knobs at zero. Changed speaker cables and cabs with the same results. Do you get any such noise from your amp, or did I get a bad one?