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FDP Forum / Fender Bass Guitars and Bass Amps / Paging Uncle Stack Knob

The Thumb

US

Jan 12th, 2017 05:39 PM   Edit   Profile   Print Topic   Search Topic

Dear Uncle

All my life I wondered why I could never get the tone I was looking for out of a Jazz bass until I played a vintage stack knob. I want to do a build and I see a lot of confusion as to what was original. If you can help me with a parts list I would be grateful. Not at all concerned with dielectric material just values ;)

which pot value 250k/250k or 250k/500k
which caps
how to wire
anything else?

Thanks so much

(This message was last edited by The Thumb at 07:47 PM, Jan 12th, 2017)

uncle stack-knob
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united kingdom

Jan 13th, 2017 03:15 PM   Edit   Profile   Print Topic   Search Topic

Do you want to wire as a vintage re-issue,or as an original Bass?

Stack-Knob.

The Thumb

US

Jan 13th, 2017 05:53 PM   Edit   Profile   Print Topic   Search Topic

Original as I understand there are differences. I don't mind the volume loss.

uncle stack-knob
Contributing Member
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united kingdom

Jan 14th, 2017 03:47 AM   Edit   Profile   Print Topic   Search Topic

You may do well in that case to contact "Luxe Capacitors" in L.A. as they do a superb kit of caps and resistors,which if you combine with the appropriate pots,CTS, and suitable pickups,will get you as close as is possible without buying an original bass... The kit comes with a good diagram.
Stack-Knob.

(This message was last edited by uncle stack-knob at 05:49 AM, Jan 14th, 2017)

uncle stack-knob
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united kingdom

Jan 14th, 2017 03:52 AM   Edit   Profile   Print Topic   Search Topic

Here they are,and if you mail them just ask for the stack-knob kit with diagram.

Stack-Knob.

mail them

The Thumb

US

Jan 14th, 2017 09:30 AM   Edit   Profile   Print Topic   Search Topic

Thanks for the lead, I appreciate you sharing what you know. One last question, I've heard the origins concentric pot values were 250k/250k but the reissues are 250k/500k are you able to confirm what the original values were?

uncle stack-knob
Contributing Member
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united kingdom

Jan 14th, 2017 03:26 PM   Edit   Profile   Print Topic   Search Topic

They used both as far as can be ascertained.
250k/250k are present on first examples,but later on the higher values can be found.
However, the issue when metering the assemblies today is obvious,given all the "vintage preservation"and so on, and opinions regarding any de-soldering that would have to occur.
I would think it a good idea to make up a couple of control plates with each of the values,and try them out.
Start with the 250k/250k .
Remember that you don't want to cause unnecessary treble.....
That is too much. So think about the pickups carefully.
In truth,you may also consider an increased capacitor value for experimentation purposes,maybe as high as .08 mfd.
Above that value,or about that value,the tones begin to act on the volume as the tone is rolled back.
Interested to see how it all works out.

Stack-Knob.

The Thumb

US

Jan 14th, 2017 05:28 PM   Edit   Profile   Print Topic   Search Topic

All appreciated Uncle. I was going to play with cap values anyways. I'm a believer is using your ears but I wanted to have a base line to start with. I have to finish this amp project first....

FDP Forum / Fender Bass Guitars and Bass Amps / Paging Uncle Stack Knob




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