J-Bass Volume Control Interaction.

[idsnowdog]

I am using this J-Bass diagram except I have two volumes, no switch, and no tone. Both volumes have a treble bleed. I have a 500K pot for a Rickenbacker neck pickup and a 1 meg pot for a Artec Mudbucker in the middle position. I have read that the volumes are supposed to be independent and there should be little interaction between the pots. However, I notice that the taper for both B pots are slightly off and that I need to have either volume at 5% to get any signal. I am also going to add a Firebird mini at the bridge position and plan to use three on/off mini toggles and a volume pot for each pickup. Can I modify the wiring to remove interaction or do the different value pots screw things up? Do the treble bleeds cause any interaction? Would having the mini toggles before or after the pot be more effective?

 

[idsnowdog]

1

 

[uOpt]

I am using this J-Bass diagram except I have two volumes, no switch, and no tone. Both volumes have a treble bleed. I have a 500K pot for a Rickenbacker neck pickup and a 1 meg pot for a Artec Mudbucker in the middle position. I have read that the volumes are supposed to be independent and there should be little interaction between the pots. However, I notice that the taper for both B pots are slightly off and that I need to have either volume at 5% to get any signal. I am also going to add a Firebird mini at the bridge position and plan to use three on/off mini toggles and a volume pot for each pickup. Can I modify the wiring to remove interaction or do the different value pots screw things up? Do the treble bleeds cause any interaction? Would having the mini toggles before or after the pot be more effective?

When you turn one pot all the way down, does the whole thing go dead?

 

[beaubrummels]

I think the treble bleed makes them not independent because you are always leaking signal to the outside lug, instead of all signal going through the wipers.

 

[eclecticsynergy]

Also, some treble bleeds will screw up the taper of your volume pots.
A plain cap won't change the taper, and a cap/resistor in series isn't bad.
But the cap/resistor in parallel (popular among prewired ones) changes the taper quite a bit.

 

[Artie]

I have a technique that I've experimented with, that helps solve the "independent" volume problem, but it isn't ideal, (or popular), because it requires each pot to be a ganged pot, which can be difficult to find. The diagram is on my other computer. I'll look for it, and post it, when the sun comes up. (Post coffee.)

 

[idsnowdog]

I think the treble bleed makes them not independent because you are always leaking signal to the outside lug, instead of all signal going through the wipers.

I could live without the treble bleeds. Although having one on the Mudbucker is useful.

 

[idsnowdog]

Getting rid of the treble bleeds mostly resolved the problem.