My new Fender Bassman 60 makes a honking buzz on the first three frets of the E string. F,F# and G sound awful. F# in particular sounds the worst. I thought it was my bass, (Mexi Jazz) and changed strings, neck and now pups. The amp still honks on the low notes, but open E sounds OK. Same thing when I play my Hamer Cruise through the amp. I have my bass volume at ten and the amps volume at five. At low volumes the amp sounds OK, but who's having fun at low volumes? Wassup wit dat???