FDP Forum / Paging Uncle Stack Knob/ 8 messages in thread.

1 to 8 of 8 shown.


The Thumb



US

Jan 12th, 2017 05:39 PM        

Dear Uncle<br /> <br /> 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 ;)<br /> <br /> which pot value 250k/250k or 250k/500k<br /> which caps<br /> how to wire<br /> anything else?<br /> <br /> Thanks so much



uncle stack-knob

Contributing Member
**********
****

united kingdom

Jan 13th, 2017 03:15 PM        

Do you want to wire as a vintage re-issue,or as an original Bass?<br /> <br /> Stack-Knob.



The Thumb



US

Jan 13th, 2017 05:53 PM        

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



uncle stack-knob

Contributing Member
**********
****

united kingdom

Jan 14th, 2017 03:47 AM        

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.<br /> Stack-Knob.



uncle stack-knob

Contributing Member
**********
****

united kingdom

Jan 14th, 2017 03:52 AM        

Here they are,and if you mail them just ask for the stack-knob kit with diagram.<br /> <br /> Stack-Knob.



The Thumb



US

Jan 14th, 2017 09:30 AM        

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
**********
****

united kingdom

Jan 14th, 2017 03:26 PM        

They used both as far as can be ascertained.<br /> 250k/250k are present on first examples,but later on the higher values can be found.<br /> 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.<br /> I would think it a good idea to make up a couple of control plates with each of the values,and try them out.<br /> Start with the 250k/250k .<br /> Remember that you don't want to cause unnecessary treble.....<br /> That is too much. So think about the pickups carefully.<br /> In truth,you may also consider an increased capacitor value for experimentation purposes,maybe as high as .08 mfd.<br /> Above that value,or about that value,the tones begin to act on the volume as the tone is rolled back.<br /> Interested to see how it all works out.<br /> <br /> Stack-Knob.



The Thumb



US

Jan 14th, 2017 05:28 PM        

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....



Copyright 1999-2003 Fender Discussion Page, LLC. Visit the web site at http://www.fenderforum.com