Vintage Seymore Duncan p/j pick up ID

[Wileee]

I could use some help identifying the pick ups on a bass I bought today. I've got a 1982 Fender Precision bass with Seymore Duncan P/J pick ups that have 3 little micro toggle switches on each of the pick ups on the right hand side of the pick up(one set on one half of the split P pick up, one on the Jazz pick up). I'm assuming these are frequency controls of some kind- I'm just curious how they work. Anyone ever seen these before?

Thanks,
Wileee

[mmbongo]

Google is your friend

http://www.seymourduncan.com/support..._have_the_old/

Functions of switches on old-style "Active EQ" bass pickups
We stopped making the switch pickups ("Active EQ") in the mid-'90s. We replaced them with the Pro-Active? series.
The little rocker switches on the Active EQ pickups change the sound. Switch #1 shifts the coil resonance. On a Jazz Bass? neck pickup and a P Bass? pickup, the resonance moves downward from 22 KHz to 6.4 KHz. On a Jazz Bass bridge pickup, it move downwards from 17 KHz to 4.9 KHz. The effect is to give a more focused sound with a harder attack. Switch #2 gives a broad band bass boost of 4 dB for the Jazz Bass neck and P Bass pickups, and 5 dB for the Jazz Bass bridge. The switches can be a very effective tool for changing the tonal "character" of your instrument.

[Wileee]

Thanks so much for the link and the explanation. I put a new set of Roto Sounds on my bass and just smoked through some old Iron Maiden tunes. Those pick ups really give the bass a neat tone! You folks here on TB are awesome!! Thanks again!

Wileee