Thanks BP!! Just tested it in the seller's home, without to much volume... but could feel easily its growling!! Tomorrow will buy a step-up transformer (the amp is rated at 375W, and I have a 500VA one to use with the Laney) of, don't know exactly, but maybe 750VA, to 'let it breathe'... then, this Saturday will play it at home with a mild volume, with my monster board, to see if I can reduce it in the near future, even that just a bit!! I'm stunned here with my first head, my first Marshall!! Hope it was a sure shot!!