Sorry if this has been addressed before, but there are just too many pages to go through. I have an opportunity to purchase a used/demo BHA-1 from a dealer, but I noticed that it's a very early model and looks different than the newer BHA-1. It lacks Balanced outs and the toggle switches seems to be different. I have no need to use the BHA-1 as a preamp. Is the sound-quality about par with newer models? Are there other differences I should know about? Thank you.