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02-14-2008, 12:47 PM
|  | Registered User | | Join Date: Mar 2006 Location: Lansing, Michigan | | | 62' RI P-Bass Tone Pot Question
I just recently rewired my Precision bass using the fender 62' RI wiring schematic from fender.com. However to my suprise, the tone pot is reversed from how I expected. Up all the way is tone on, down all the way is tone off. I expected it to the the normal tone pot where up all the way is tone off, down all the way is tone on.
Can anybody confirm that this is the 62' RI behavior or did I botch it up?
Also is there any way to improve the range of variation of the knob. Mine seems to make all of its effect in the last 1/4 turn. The pots are CTS 250k audio taper pots, so i'm pretty sure that its the correct pot.
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Last edited by joelb79 : 02-14-2008 at 01:02 PM.
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02-14-2008, 01:44 PM
| | Registered User | | Join Date: Mar 2006 Location: Lansing, Michigan | | | Nevermind, I confirmed this was intentional from following the wiring diagram. The American Standard basses use a more normal tone control, it is reversed on vintage basses.
__________________
"But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:" Matthew 6:20
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02-14-2008, 01:57 PM
| | Registered User | | Join Date: Mar 2004 Location: Czech | | Here is pic of unmodified wiring of my 62 RI P-bass, if still interested.
Fully clock-wise the tone is open (treble not tamed), same as the volume knob.  |
02-14-2008, 02:01 PM
| | Registered User | | Join Date: Nov 2002 Location: USA | | | Hmmm I should check mine. I though they were all the same.
clockwise more volume
clockwise more treble |
02-14-2008, 02:09 PM
| | Registered User | | Join Date: Mar 2006 Location: Lansing, Michigan | | Quote:
Originally Posted by nemo  Here is pic of unmodified wiring of my 62 RI P-bass, if still interested.
Fully clock-wise the tone is open (treble not tamed), same as the volume knob. | Nemo, my wiring looks identical! Yet, clockwise = tone closed. Maybe I got a bum pot? thats just too weird for me to fathom. Here's the diagram I followed, which is a spot on from yours. http://www.fender.com/support/diagra...190116CPg2.pdf
Here is what i'm going to modify it too once I get home (American Standard Wiring): http://www.fender.com/support/diagra...200_02APg2.pdf
__________________
"But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:" Matthew 6:20
Last edited by joelb79 : 02-14-2008 at 02:22 PM.
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02-14-2008, 02:16 PM
| | Registered User | | Join Date: Jun 2005 Location: Central Indiana | | | I rewired mine using the "'62 American Vintage" diagram. Clockwise on the tone knob gives me more treble, which is the behavior I expected. I didn't know that some configurations reverse the behavior of the knob. |
02-14-2008, 02:18 PM
| | Registered User | | Join Date: Jun 2005 Location: Central Indiana | | | Joel, I think your first link goes to a Jazz bass diagram... |
02-14-2008, 02:21 PM
| | Registered User | | Join Date: Mar 2006 Location: Lansing, Michigan | | |
__________________
"But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:" Matthew 6:20
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02-14-2008, 02:24 PM
| | Registered User | | Join Date: Mar 2006 Location: Lansing, Michigan | | Quote:
Originally Posted by IndyBass I rewired mine using the "'62 American Vintage" diagram. Clockwise on the tone knob gives me more treble, which is the behavior I expected. I didn't know that some configurations reverse the behavior of the knob. | I think I'm just used to counter-clockwise (down) being less treble and clockwise (up) being more. It may come from just about every Jazz is that way, and every new P bass comes wired as such. Its a simple fix. I'm more interested in fixing the 1/4 turn is everything problem with my tone nob. Maybe adding a 47k ohm resistor clears that up, i'm just not sure where that gets added.
__________________
"But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:" Matthew 6:20
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02-14-2008, 02:31 PM
| | Registered User | | Join Date: Jun 2005 Location: Central Indiana | | | Just to clarify: When I say CW and CCW, that is as I'm looking at the knob from the pickguard/shaft side, not looking at the back of the knob from the shield side. Are we saying it the same way? 'Cause if so, it sounds like we used the same diagram but got opposite tone knob behaviors, which is unlikely. Just curious. |
02-14-2008, 02:35 PM
| | Registered User | | Join Date: Mar 2004 Location: Czech | | | Regarding the "1/4 turn only function" issue - you probably need to get original pots and strictly follow the wiring on the pdf.
I know this issue and on my non-fender jazz which I modified I had this problem all the time, despite the various pots and capacitors I tried.
I was just pleasantly surprised that my stock AV62RI had it functioning continuously across the whole turn (as it shoud be).
As for the logic of the turning direction - if you have it wired identically - it is weird. Anyway I would try to get Fender original pots and this should solve both issues.
Just my unscientific 2 cents.
Regarding the semantics - normal tone knob operation should be same as the volume knob - i.e. geting full volume and full open tone by turning in the same direction. |
02-14-2008, 04:25 PM
| | Registered User | | Join Date: Mar 2006 Location: Lansing, Michigan | | | As I'm looking at the schematics from fender, the 57' and 62' RI have reversed tone pots from the American Standard/Highway-1/MIM. I'm going to reverse mine tonight. Isn't there a cap that I can add across the hot lead on the pot that keeps the tone pot from loading onto the pickups?
Either way, if I reverse it, it would seem to me that I get the first 1/4 turn un-effected, and the last 3/4 affected.
Also I'm using CTS pots, which are the same as fenders. Same stamping, just not an exposed pole as you see on the fenders.
__________________
"But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:" Matthew 6:20
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02-14-2008, 05:44 PM
| | Registered User | | Join Date: Mar 2006 Location: Lansing, Michigan | | Oh foo foo.. Joel wired his tone pot wrong. All issues resolved. 
__________________
"But lay up for yourselves treasures in heaven, where neither moth nor rust doth corrupt, and where thieves do not break through nor steal:" Matthew 6:20
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02-15-2008, 05:22 AM
| | Registered User | | Join Date: Mar 2004 Location: Czech | | | |
02-15-2008, 05:28 AM
|  | Quatre-cordes | | Join Date: Jun 2006 Location: New Orleans, LA /El Paso TX | | Quote:
Originally Posted by joelb79 Oh foo foo.. Joel wired his tone pot wrong. All issues resolved. | hey I think somebody got too many projects on his hands  | | Thread Tools | Search this Thread | | | | 
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