Positive Preamp as described. Marleaux is recommended by Ariane Cap and the Tonewerks preamp is punchy and flexible tone wise.
Positive Tommyjbass picks out really good equipment and keeps it in great shape. I will watch for other pieces to buy if he sells. He is easy to deal with and has impressive chops.
The Demeter 201S is clean, warm, easy to get tone with the great frequency switching points. Transparent, the character of bass easily comes threw.