Hello to all: A little background on my rig before posting the question. I use mainly Fender basses ('72 Jazz, '75 Precision, '13 Cabronita, '13 Road Worn Jazz bass and the odd duck SG bass) to a 1972 Ampeg SVT. Pedals include - a Boss OC-2, a Keeley Fuzz Head, a Moog MF-101 Envelope filter, a MXR Phase 90 reissue and a EHX Memory Boy. When I use my '72 Jazz bass, I find I can't have either pickup's volume anywhere close to max without creating ear splitting feedback. In general, with both guitar and bass, I like having my pickups dialed as hot as possible and then adjust volume and levels either on the amp or through pedals. On the '72, I have to back WAY off on the pickup volume and adjust in other places. The tone I get is different but basically fine. This only happens with the '72. It doesn't happen on any of my other basses. I had the bass checked through by my tech who couldn't find anything wrong. Now if I just need to play it as is, that is fine as I have an answer. But has anyone else had a similar issue? I would love to find a fix. As it is, if I switch basses during a session, I need to dial in a whole set of new settings.