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12-31-2009, 01:50 PM
| | Registered User | | Join Date: Nov 2008 Location: Madison, WI | | | Pot and Cap Values for a PJ
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I'm working on a PJ project and I'm wondering what the best pot values to use are. The P pickup is going to be a Quarter Pounder and the J will probably be a QP as well. Instead of the standard VVT setup, I'm going to have the first pot be a concentric pot that will control the volume for each pickup, and the second pot will be a push/pull for a master tone and series-parallel switching. The spot where the tone would normally be I'm going to use for the output jack, and then maybe put a killswitch down where the output jack is supposed to be.
My goal is to be able to solo the P pickup and have it sound like a regular P bass without having that 3rd pot in the signal path like in most PJs. Would 250k pots be what I'm looking for, or would 500k suite me better? Also, what value tone cap would you guys recommend? |
12-31-2009, 02:00 PM
|  | Thread Killer | | Join Date: Jun 2008 Location: Valley of the Sun (AZ) | | | 250k and 0.047uF should work fine, but to solo the P and remove the J pot and pickup you need another switch.
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12-31-2009, 02:00 PM
|  | Supporting Member | | Join Date: Jun 2008 Location: Close to Los Angeles, CA | | | Pot and capacitor values are highly a personal preference.
If you want the traditional P setup with the J turned all the way off, using two 500K volumes would be the same as the one 250K pot on a regular P bass, however, this is assuming the P's volume is on full. When you turn it down, that will mess around with the taper and such.
The closest thing I would say is two 500K volumes, a 250K tone and a 0.047uF capacitor. |
12-31-2009, 02:01 PM
| | Supporting Member | | Join Date: Jun 2008 Location: Close to Los Angeles, CA | | Quote:
Originally Posted by slyjoe  205k | 250K  |
12-31-2009, 02:04 PM
| | Registered User | | Join Date: Oct 2004 Location: Tampa/St. Petersburg | | | I am contemplating the same thing. What is the best way to isolate that P in a PJ configuration? I just want to be able to toggle between "pure P" and PJ. I was going to use a stellartone control. I am not concerned with panning abilbity and have freedom to configure controls. |
12-31-2009, 02:06 PM
| | Supporting Member | | Join Date: Jun 2008 Location: Close to Los Angeles, CA | | Quote:
Originally Posted by angelopb I am contemplating the same thing. What is the best way to isolate that P in a PJ configuration? I just want to be able to toggle between "pure P" and PJ. I was going to use a stellartone control. I am not concerned with panning abilbity and have freedom to configure controls. | Either use a 3 way pickup selector switch to remove the J pickup's pot from the circuit when you solo the P, or put a push/pull on the J pickup's volume to remove the pot from the circuit.  |
12-31-2009, 02:10 PM
| | Thread Killer | | Join Date: Jun 2008 Location: Valley of the Sun (AZ) | | Quote:
Originally Posted by line6man 250K | Duck 
I fixed it.
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Practice doesn't make perfect - it makes permanent.
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12-31-2009, 02:20 PM
| | Registered User | | Join Date: Oct 2004 Location: Tampa/St. Petersburg | | Quote:
Originally Posted by line6man Either use a 3 way pickup selector switch to remove the J pickup's pot from the circuit when you solo the P, or put a push/pull on the J pickup's volume to remove the pot from the circuit. | cool! thanks. |
12-31-2009, 02:41 PM
| | Registered User | | Join Date: Nov 2008 Location: Madison, WI | | Wow, I feel dumb. For some reason I didn't realize having a concentric volume pot would still have 3 in the signal path.
As far as caps go, I'm a little confused. I'd like to order them from Small Bear Electronics ( http://www.smallbearelec.com/StoreFront.bok), but I'm seeing different places list the values different. Small Bear uses "mf", not "uf". Am I correct in guessing either is a substitute for Mu/micro, or are they two different values? Would I want a .0047mf cap or a .047 mf cap?
Also, what's the difference between Sprague's 715 and 716 series? |
12-31-2009, 02:55 PM
| | Supporting Member | | Join Date: Jun 2008 Location: Close to Los Angeles, CA | | Quote:
Originally Posted by mremic01 Wow, I feel dumb. For some reason I didn't realize having a concentric volume pot would still have 3 in the signal path.
As far as caps go, I'm a little confused. I'd like to order them from Small Bear Electronics ( http://www.smallbearelec.com/StoreFront.bok), but I'm seeing different places list the values different. Small Bear uses "mf", not "uf". Am I correct in guessing either is a substitute for Mu/micro, or are they two different values? Would I want a .0047mf cap or a .047 mf cap?
Also, what's the difference between Sprague's 715 and 716 series? | mF and uF *should be* the same thing.
The "u" stands for symbol: µ
MicroFarads are usually either notated as "µF" or "MFD"
You would want a 0.047µF capacitor. |
12-31-2009, 07:58 PM
| | Registered User | | Join Date: Nov 2009 Location: San Diego | | | depends on the sound you want. the Ibanez PJ I bought had 500K pots and a .047uf tone cap. The bass was too bright for a fretless so I tried different caps and settled with a .1uf cap |
12-31-2009, 08:46 PM
| | Registered User | | Join Date: Nov 2008 Location: Madison, WI | | | Would the Quarter Pounder J be a good match for the QP P? It's a single coil, so I imagine it would create some hum when it's on. | | Thread Tools | Search this Thread | | | | 
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