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J Pickup Buzz

I have a Squier Deluxe Precision Bass I got today, and when the tone knob is up at all, and the Jazz Pickup is up, there is a buzz coming from my amp -

I don't know what it is or why! When I turn the tone knob all the way down - it doesn't happen. Anyone know why?
 
I got me a used MIM Fender Jazz (2001 model, perversely good shape) for Squier money, $270. If I don't have both pups on or the tone all the way back, the thing buzzes like a beehive. I just got a shielding kit from Stewart-MacDonald. I can't speak for the specific results that shielding will produce, but an article on the StewMac site insists that good shielding will kill buzz as well as a dual coil pickup. Here's some of the article:

Carlos Santana’s Strat
Here’s an impressive shielding job. A few months back, Dan Erlewine received a cool mid-60s Strat from Carlos Santana. It needed to be refretted and set up. Inspecting the guitar showed that someone had totally shielded the instrument — the pickup cavities, the pickguard, and even the trem spring cavity and cover on the back. For extra strength and electrical continuity, they soldered the overlapping pieces of foil together — a very thorough job indeed! And the buzz is long gone.

Speaking of totally shielded, the old Danelectro/Silvertone guitars were super-shielded. The covers of their classic lipstick tube pickups acted as shields, and the components inside were encased in copper.

When Nat Daniel, the inventor/founder of Danelectro, introduced these “Totally Shielded” guitars at the NAMM (Nat’l Assoc. of Music Merchants) show, he set up a large neon sign in the exhibition hall. The Dan-os sounded just fine right next to that big neon, while it had other single coils buzzing out of control!

The rest of the article is at:
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i just got my squier P special today and i noticed the same thing. the P pickup is silent, but the J buzzes... on my J bass, it buzzes if either volume isn't all the way up, but the P/J bass buzzes whenever the J volume is on. i was thinking about replacing the pups down the road anyway. but it looks like the shielding paint may be the way to go! thanks.