Advice on Jazz bass series/parallel assembly

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JimP
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Advice on Jazz bass series/parallel assembly

Post by JimP » 15 Sep 2018, 10:13

Hu guys.

I recently got a set of Bill Lawrence J45 noise free pickups for my 62 AVRI Jazz. I'm taking the opportunity to change my setup from the 62's stacked VTVT to a 3 knob VVT with a series/parallel switch or push/pull pot. I'm not clever enough to do this myself so I'm looking at getting a pre-wired assembly and swapping the control plates over. Searching online I found Rothstein Guitars in the US http://www.guitar-mod.com/mm5/merchant. ... _Code=J100
Then I thought surely there must be local electronics gurus who make these. Any thoughts/advice?

Cheers, Jim
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vin-tone
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Re: Advice on Jazz bass series/parallel assembly

Post by vin-tone » 16 Sep 2018, 13:04

Seymour Duncan has a great collection of wiring diagrams. eg..

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Re: Advice on Jazz bass series/parallel assembly

Post by bassbass » 16 Sep 2018, 16:46

Any reputable tech can do this. Bread and butter work...

Even if you buy a replacement to install yourself, you'll still have to solder the pickup leads.

FWIW with a jazz, I'd recommend linear pots for the two volumes because they are easier to tweak for pickup blend. And also, if you do buy a prewired circuit, don't buy in to the high-voltage-caps-sound-better thing. It's pretty much nonsense. Switchcraft jacks are good quality and I'd strongly recommend these. As for pot brands, really any pot, even cheapies will last a good long time if soldered correctly.
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JimP
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Re: Advice on Jazz bass series/parallel assembly

Post by JimP » 16 Sep 2018, 16:52

Thanks man, I did come across that diagram but my soldering skills are woeful! Hence hoping to find one pre-assembled by someone with the skills and knowhow. Or did you mean to take a wiring diagram to a local tech guy?

The Rothstein site I linked to also has different options for pots and capacitors. Don't know how much difference they would make... maybe very little... maybe a lot! I just have no idea :lol:
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JimP
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Re: Advice on Jazz bass series/parallel assembly

Post by JimP » 16 Sep 2018, 16:56

Bassbass you answered my question faster than i could type :lol: That's good info, thanks. What about 250 vs 500 value pots?
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Re: Advice on Jazz bass series/parallel assembly

Post by bassbass » 16 Sep 2018, 19:16

Ha. Musta been typing at the same time...

Yeah 500k pots will give you just a hair more brightness. If you use them I'd definitely use linear (B) tapers for vol. (use audio taper for tone though.

The difference is pretty subtle. If you use flat wounds or don't have a tweeter in your cab you won't hear any difference.

If you do like bright tones you may want to use a no-load tone pot. It switches out of the circuit when maxed. I even invented a no-load volume pot a while back...
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JimP
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Re: Advice on Jazz bass series/parallel assembly

Post by JimP » 16 Sep 2018, 20:56

Thanks Rob, your advice is invaluable. My son bought a Les Paul with no-load tone pots so I've come across them before. I do play with flats (old Chromes) and love the feel and thump enough to not want to change from flats, but my tone is just a little bit too dark as it is. You don't think no-load 500k pots would make any difference? (I realise a passive tone pot can't add in frequencies a string doesn't produce... I'm trying out different strings too)
Thanks again :)
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Re: Advice on Jazz bass series/parallel assembly

Post by noplanb » 16 Sep 2018, 21:19

Try taping a strip of mild steel (at least 1mm thick) to the back of the pickup - is the fastest reversible way to see what your pickup sounds like with more mid.
I have a Greco HiPower-style pup with that on semi-permanently - gives it just enough extra bite.
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JimP
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Re: Advice on Jazz bass series/parallel assembly

Post by JimP » 16 Sep 2018, 21:51

noplanb wrote:
16 Sep 2018, 21:19
Try taping a strip of mild steel (at least 1mm thick) to the back of the pickup - is the fastest reversible way to see what your pickup sounds like with more mid.
I have a Greco HiPower-style pup with that on semi-permanently - gives it just enough extra bite.
Now that's a hack I would never have even dreamed of! Thanks man, I'll bear that one in mind :)
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Re: Advice on Jazz bass series/parallel assembly

Post by skullsplitter » 02 Oct 2018, 09:29

Did you go anywhere with this JimP? I'm also thinking about swapping a stack knob for VVT. I like tone turned up for finger playing and rolled off a bit for pick playing. Finding this to be a real hassle with stack knobs. Probably impossible on a dark stage.
I temporarily rewired mine for series and think that's worth having as well.

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Re: Advice on Jazz bass series/parallel assembly

Post by JimP » 02 Oct 2018, 11:41

Not yet, but after playing around unsuccessfully with different pickup volume & tone combinations over the weekend, my mind's made up. I just need to track someone down locally who can do it. Also toying with the idea of getting connectors wired inline for any future pickup or control plate changes.
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skullsplitter
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Re: Advice on Jazz bass series/parallel assembly

Post by skullsplitter » 03 Oct 2018, 13:05

$150 to $200 posted seems to be the going rate for pre-assembled and installing it yourself. I'd be surprised if a decent local tech would cost much more than that.
If you're in Melbourne I can recommend David at Melbourne School Of Guitar Making or Harvester Guitars in Seddon (he's a bass player so you know you can trust him 😊 ). Both do great work at a fair price and are happy to discuss things on the phone.
I'm leaning towards DIY rewiring to just use one of my tone pots as a master, leave the other pot disconnected. I'd hate to spend a bunch of money on new controls and find I prefer the original.

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Re: Advice on Jazz bass series/parallel assembly

Post by JimP » 03 Oct 2018, 15:54

I'm in northern nsw and was just recommended a good local tech from a trusted source today, so I'll chase that lead up :)
skullsplitter wrote:
03 Oct 2018, 13:05
I'd hate to spend a bunch of money on new controls and find I prefer the original.
Kinda why I was considering the connectors. Plus if I ever want to sell the bass it's an easy swap back to the original setup.
Fender 62 AVRI Jazz, Ampeg V4B, Ampeg SVT 212

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JimP
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Re: Advice on Jazz bass series/parallel assembly

Post by JimP » 11 Nov 2018, 07:29

An update on this for anyone who's interested... I had trouble finding someone local to me who was experienced and confident in doing this. Then I remembered that the guy my son bought his guitar from often upgrades the wiring in guitars he sells. He's in Brisbane, trades as String-Switch-Noise and is on FB as Brenton Maybury. Lovely guy, helpful, knowledgable and does great work at a really reasonable price.

He made me up a control plate with
- VVT layout with series/parallel push/pull pot
- treble bleed volume circuit, 500k pots, linear (B) taper
- no load tone circuits, 500k pots, audio taper

Many thanks to you Rob for your advice above which informed this process. Now looking forward to getting this installed with my new Bill Lawrence pups :)


Fender 62 AVRI Jazz, Ampeg V4B, Ampeg SVT 212

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