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Post subject: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Tue Feb 25, 2014 8:06 am
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I received the CS 60's pups last week, model # 0992101000, to install in my 1985 Fender Japan Jazz Bass. I've been told it's a '75 Reissue.

I was advised by several of you to replace the pots, wiring and jack and to also shield the cavities. Good advise here, of which I am in agreement.
I'm thinking about doing this project myself (but maybe not), and on initial inspection of my bass I found a few things that I wasn't expecting.

First, there is a brass or copper plate under the control cavity on my bass, and it's screwed into the body. I'm pretty sure there are plates under the pups too from what I can see without removing them. The CS 60's pups came with these same plates.
So my first question is: Should I go ahead and shield the cavities and leave these plates in, or do the plates act as shielding?

Second, there is no ground wire from the bridge that goes directly to the control cavity - not even a hole for the wire in the normal place.
Does this wire run from the bridge pup cavity to the bridge? If so, do I use the wire attached to the the pickup plate?

Third, there is rust under the control plate near the pickguard, and crud in the same area. It looks like someone spilled coke or something on it.
Should I replace the plate too? Is this rust a bad thing?

Thanks in advance guys!


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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Tue Feb 25, 2014 8:45 am
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The brass plates in the control cavity and pickup routs provide shielding -- they should be left in situ. There should be some foam-rubber strips attached to the plates in the pickup routs. I believe they're to help prevent feedback and unwanted microphonics.

Traditionally, the Jazz Bass's bridge is grounded via a wire running between it and the bridge pickup. On basses built before roughly 1966 a thin strip of brass ran externally between the bridge pickup's shielding plate and the bridge plate. This strip was visible when the chrome bridge cover was removed.

Rust or any other type of corrosion is not a good thing -- cosmetically it's a turn-off and it will impede continuity if the part is used to provide an electrical ground. Try removing such effluvia using Naval Jelly or Simichrome and a Scotch Brite scouring pad. Do not use steel wool as this medium will scratch chrome plating.

Arjay

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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Tue Feb 25, 2014 11:19 pm
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The grounding plate in the cavity is what one would expect of a '75 JB. The wires from the pup grounding plates will have been soldered to this as well as the ground wire from the bridge. It's interesting that there is no wire or channel for such on your bass. I have seen this before on a $@! Telecaster which had a ground channel but no wire either through it or to the rear pup grounding plate.

If you want to keep it authentic, you'd have to get a channel drilled. Be careful if you're going to attempt this yourself. You need a very long drill bit and be careful you don't go through the body.


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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Wed Feb 26, 2014 6:53 am
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Thanks for the input Arjay!
I have seen photos of MIJ jazz basses with the ground wire over the top of the body like you described. My bass does not have this wire showing, so I hope that there is a hole for the ground wire between the bridge pup and bridge. If not, then I will have to put a ground strip over the top of the body.
I wonder though, if it will help at all to shield the cavities with copper tape since these shield plates are in place.
And if I buy a pre-wired control plate, do I need one that is specific to this bass and/or the new CS 60's pups, which also have this shielded plate?
Thanks again, Jim


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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Wed Feb 26, 2014 7:04 am
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Jakey,
I haven't taken the old pups out to find out if there is a hole for the ground wire between the bridge pup and the bridge. I'd rather get as much info as possible before I take anything apart.
There is no battery, so AFAIK these are passive pups and would need a ground to bridge. If there is no wiring channel then I'll run a ground strip over the top like the older ones Arjay described, but hope I don't have to.
Thanks, Jim


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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Wed Feb 26, 2014 8:55 am
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The 1985 Japanese made Jazz basses were 1962 reissue Jazz basses in that they had the early 60's neck dimensions and it should have the exposed grounding strip between the bridge and the bridge pickup grounding plate. To be faithful to the original design these basses did not have a ground wire hole drilled from beneath the bridge to the control cavity like more modern Jazz basses. IF someone removed the grounding strip from your bass you can make another one out of brass and it should be soldered to the bridge pickup ground plate and run under the bridge halfway so that it makes contact with the bridge.

A 1975 Jazz would certainly have the ground wire from the bridge to the control cavity, If your bass does not have this hole then it needs the strip to be original.

The foam rubber under the pickups is solely for height adjustment and has no bearing on feed back or other sound considerations.

All ground plates are for shielding and IMHO should be left in place. If you want to add shielding , then do so around the plates and make contact with the plates and the control plate so the shield is complete.

Steel wool- I use 000 steel wool on my bass to remove rust. Just be careful not to get it on your pickups.

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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Wed Feb 26, 2014 9:36 am
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63p-bass wrote:
And if I buy a pre-wired control plate, do I need one that is specific to this bass and/or the new CS 60's pups, which also have this shielded plate?


Be very careful when buying any replacement parts for your MIJ Jazz Bass. I once bought a MIJ Jazz Bass pickguard with the intent to install it on a MIM Jazz Bass body and nothing quite lined up with the Mexican body -- neither the cut-out for the neck pocket nor the finished edge that mates up to the control plate. As well, the pickup hole was too small to accommodate a MIA pickup and none of the mounting-screw holes lined up with those in the body. Unlike the interchangeability between MIJ and MIA Strats, the MIJ Jazz Bass seems to have sufficient dimensional differences to make parts swapping problematic. That gorgeous MIJ mother-of-pearl pickguard remains in my spares box, unused.

:(

Arjay

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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Thu Feb 27, 2014 6:46 am
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I have decided that I'm gonna let my friend, a long time music store owner and guitar tech, swap out the pickups in the next few days. He can get it hashed out, and it'll be better to let someone with more experience than me tackle this.
I'm looking forward to getting it back and gigging with it, hopefully next Monday. Thanks for the tips guys! I'll be back with a report on how the new pups work out.
Jim


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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Thu Feb 27, 2014 9:48 am
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How about some pics when you get the instrument back, Jim?

Arjay

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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Thu Feb 27, 2014 10:08 am
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Sure, I don't mind showing it off again. It's natural finish with a maple board, bound and block inlays in cream color. White pearl pg that is not original. Thinking of putting a black one on it.


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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions - UPDATED
Posted: Mon Mar 31, 2014 6:54 pm
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Well it took me a couple weeks to get the money together for the new pup installation, but it's done now and I'm pleased with the results. I had my tech do it for me so I don't have any pics of the project but I'll put in a previous pic of the bass.
I had him put in new 250K pots and a new jack, wiring and .047 Orange Drop cap along with the CS 60's pups.
I like the way it sounds at home and in the practice room, but haven't gigged with it yet. The band has had nearly a month off, the most time off from music that I've had in the last 5 years. I'll get to test it this Thursday night though - we're opening for Tab Benoit at a local club. So I'm pretty stoked about both the new pups and the gig.
Here's the pic:

Image

Image

I have put a black pick guard on it now, but might not keep it on.
Retroverbial - was it you who said you had a pearl guard? Is it aged pearl? I might be interested in taking it off your hands.


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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Mon Mar 31, 2014 7:57 pm
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That is one sharp lookin' 'ride' there!

Glad to hear it all worked out.

I think the MIJ pickguard I have looks just like yours except it has the holes for the tug bar below the treble-side strings.

Rawk on!

8)

Arjay

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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Mon Mar 31, 2014 8:54 pm
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Thanks Arjay! The looks of the bass are what caught my eye when I first saw it. I knew I wanted it at that point, if it was a player - and it is. It's even better now with the new pups. Can't wait for Thursday night. :mrgreen:


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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Mon Mar 31, 2014 10:33 pm
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That's one beautifully-figured piece of ash! With the bound-and-blocked fretboard, what's not to love?

:wink:

Arjay

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Post subject: Re: Custom 60's Jazz Pups Came In-Wiring Questions
Posted: Tue Apr 01, 2014 9:28 pm
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:D

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