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FDP Forum / Fender Bass Guitars and Bass Amps / Jazzbass annoying pots

pacobass

canada

Nov 9th, 2017 12:57 AM   Edit   Profile   Print Topic   Search Topic

Anyone could help with this problem please?
I have a road worn Jazz bass, plays and sounds great but the pots will work more like an on off switch then a normal 1 to 10 volume ( like on my '50 Mim P bass)

There is almost no sound between 1 and 8 and all of a sudden it open pretty much to full volume!
It seems to me most Jazz are like that???
I really need the volume to go up evenly!
Many thanks,
P.

uncle stack-knob
Contributing Member
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united kingdom

Nov 9th, 2017 03:39 AM   Edit   Profile   Print Topic   Search Topic

It seems that from what you describe,the pots you have are of the linear type.
For a Jazz Bass with the three controls,you should ideally have Audio taper pots and not linear.
Pots are so inexpensive that changing them out is no big deal.If you take the bass to a RELIABLE tech/repairman,then they can do it for you,and could also check the taper of the existing pots before making the change.
250K Audio taper pots will get you where you need to be.
Do note that it is a feature of many Jazz Basses that when you turn BOTH volumes fully up then you may detect a SLIGHT drop in volume,which disappears when you back either of the volumes off just a tad.Capacitors are a matter of taste,but .05mfd would put you in the original ballpark; .02mfd will give you a slightly more defined sound with perhaps a little more cut through,but ultimately somewhat less deeper bass when the tone is rolled right back.

So,it seems you may have linear taper pots.
If so fit Audio taper pots.
A good make is C.T.S.

Hope that helps,
Stack-Knob.

uncle stack-knob
Contributing Member
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united kingdom

Nov 9th, 2017 03:39 AM   Edit   Profile   Print Topic   Search Topic

Double post...

(This message was last edited by uncle stack-knob at 05:42 AM, Nov 9th, 2017)

Te 52

Laws of Physics

strictly enforced
Nov 9th, 2017 05:04 PM   Edit   Profile   Print Topic   Search Topic

I must respectfully disagree with usk. The characteristic of a linear pot is too much volume change from 0 to 5, and too little from 5 to 10, which is the opposite of what you describe.

pacobass

canada

Nov 10th, 2017 01:06 AM   Edit   Profile   Print Topic   Search Topic

Many thanks Uncle S-K! That's what we call a clear explanation! I know that you're a good expert in '50 and '60 fender stuff but this might interest you.
Serial # on my Road Worn Jazz is MZ 82------ that would make it very early for that model, the RW series started in 2009?

Now a jazzbass model is nothing new even in the Mexico factory so there could be a bad connection in there?
Now that I think of it, I got it second hand and the guy who had it before did a heavy distress job all over the body and it looks like a beaten up 1960's bass (result is pretty good though)
Anyway, could be that the soldering was done badly when he put it back together...
P.

uncle stack-knob
Contributing Member
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united kingdom

Nov 11th, 2017 06:57 AM   Edit   Profile   Print Topic   Search Topic

If you change the pots out for 250k Audio taper cts
and wire them as per the Fender stock service diagram for a standard Jazz Bass then it should work ok.Apologies for suggesting that your pots are definitely linear.

Te 52.. my apologies to both,my suggestion was misleading regards Linear taper.However, the pot characteristic may be at play.
Tracks aren't what they were....

As a thought,Te52,why do you think Fender wired the three control Jazz Bass with the signal from the pickup going to the centre (wiper) leg of the pots?

Stack-Knob.

Lewis

USA

Who is E. Sandoval?
Nov 12th, 2017 04:10 PM   Edit   Profile   Print Topic   Search Topic

To me, it sounds like it ain't wired correctly. Find a drawing for jazz bass wiring and compare your bass to the drawing.

pacobass

canada

Nov 12th, 2017 06:18 PM   Edit   Profile   Print Topic   Search Topic

It could very well be badly wired because the bass was taken apart for a heavy road worn treatment...
I will try to link some photos.
P.

FDP Forum / Fender Bass Guitars and Bass Amps / Jazzbass annoying pots




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