Has anyone operated the PSN amp filter on 5 - 6 volts? I recall someone on the list using 2 wall wart power supplies back to = back for the positive and negative supplies. Did you filter or = stabilize any further and if so how? Thank you for any advice.Has anyone operated the PSN amp filter = on 5 - 6=20 volts?I recall someone on the list using 2 = wall wart=20 power supplies back to back for the positive and negative = supplies. Did=20 you filter or stabilize any further and if so how?Thank you for any advice.Randy