Hi Doug! I write from Spain so sorry my poor english. First of all congratulations for your work. You are a great inspiration for many of us. Well, i think i have a MVP over 1988-1989 S.N 20XX. Is it near yours? I get it with an EMGs instead of Bartolini and with the original PREAMP. The bass had a GREAT GROWL. I change the preamp with a OBP3 and I think it has lost a bit of growl. It doesn´t roars as before. Did you change your preamp or conserve the original? Do you advise me to put the old one again. I used it in passive mode and had a great growl. The active mode had only a master volume and a red light. Now, when i put it in passive, bypassing the OBP3, it doesn´t sound as before. Anyway thanks and nice to talk you.