The C41 was made roughly 1997-2002 or so. It is a very nice preamp for the money and I thought of getting one for myself but I bought a C42 instead. The C42 has a much nicer and better volume control and more features. I also felt the C42 was more transparent and dynamic. The C41 is basically an overlooked model - there isn't anything wrong with it, it is just basic.
Arthur
Arthur