Adding a passive tone control to a bass with active 2-band preamp? *resolved*

#21
organworthyplayer337 said:
basically now the volume pots and tone pot aren't affected by the switch at all and is always routed to the output jack? Which means the switch is solely responsible for activating and deactivating the preamp
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The switch does its same job of determining whether the passive signal or the preamp signal go to the jack. You are not changing any aspect of the wiring except for adding a tone control.

As a side note, that's a horrible way to do active/passive switching, but I guess that's how Fender does it.
 
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#22
line6man said:
The switch does its same job of determining whether the passive signal or the preamp signal go to the jack. You are not changing any aspect of the wiring except for adding a tone control.

As a side note, that's a horrible way to do active/passive switching, but I guess that's how Fender does it.
Click to expand...
Ok thank you!

Fender Japan is the 8th wonder of the world.
 
#24
organworthyplayer337 said:
For the sake of not making another thread; what pot would I need for the treble/bass?

I know it needs to be stacked but values are a little hazy for me...

I'm assuming I can't use a 250k/500k?
Click to expand...

Just figure out what the current pots are, you may need a multimeter to find out but that's a very simple operation. They're usually the same value, which should make stacking easy enough, but there's no way to know what that value is unless it's stamped on the pot or found as above.
 
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#25
Nickweissmusic said:
Just figure out what the current pots are, you may need a multimeter to find out but that's a very simple operation. They're usually the same value, which should make stacking easy enough, but there's no way to know what that value is unless it's stamped on the pot or found as above.
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Ok I read that the control pots are 500kohms? Does that sound about right? If so, then finding one should be fairly simple
 
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#26
This is why I love the John East J-Tone. You definitely want the passive tone to work on passive and active,, I use it more than adjusting the bass and treble. For tone you can use either 250K or 500K will work. The lower value of the pot a little turn has a greater effect on the tone, with 500k pot you will have to turn it more to get the same effect. The stacked Treble/Bass is a 50K pot for active and can be bought at Best Bass Gear for around $19. Noble - EQ Pot - 50K Stacked - Best Bass Gear. I would call BBG and ask for Max, he may already have a diagram for what you are wanting to do.
 
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#27
organworthyplayer337 said:
For the sake of not making another thread; what pot would I need for the treble/bass?

I know it needs to be stacked but values are a little hazy for me...

I'm assuming I can't use a 250k/500k?
Click to expand...

No, EQ controls are different than volume and tone. I believe Fender uses 25K or 50k.
 
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#32
organworthyplayer337 said:
Would it be a problem to switch to 50k for both?
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Trying 50k pots certainly won't hurt anything. It'll alter the response a bit. But who knows?...you might like it that way.

organworthyplayer337 said:
Also would wiring the stacked pots be as simple as wiring them the same way as they were but just on top of each other (with the stacked pot)? Or is there another step involved?
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No additional steps involved. Just in case you didn't know, remember that (with the shaft of the pot pointing up) the lower set of lugs are for the top (inner) knob and the upper set of lugs are for the lower (outer) knob. A lot of folks who aren't familiar with using concentric pots sometimes get confused and wire them backwards.
 
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#33
MrMoonlight said:
Trying 50k pots certainly won't hurt anything. It'll alter the response a bit. But who knows?...you might like it that way.



No additional steps involved. Just in case you didn't know, remember that (with the shaft of the pot pointing up) the lower set of lugs are for the top (inner) knob and the upper set of lugs are for the lower (outer) knob. A lot of folks who aren't familiar with using concentric pots sometimes get confused and wire them backwards.
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How would it alter the response? Just curious, cause I doubt I'd be able to tell the difference anyway :roflmao:
 
#34
I sketched this out just to have it on here;
IMG_7852.JPG



Thanks everyone for the help!
 
#36
BFISHER1970 said:
There is a wire missing....
you need to connect from the output of volume 2 (or input of the tone pot) to the lug on the switch where the yellow wire is connected.
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That's what I asked line6man about and he said it would be redundant. If you look back through this thread I made a mock up with it there. Not totally sure if I need it or not
IMG_7845.JPG
 
#40
BFISHER1970 said:
Yes exactly
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Yeah that's what I asked @line6man a couple posts back and he said it would be a little redundant to do that. But me being the novice I am, I don't know the difference haha :roflmao:

I would think that that's what would need to happen, though. It would make sense that if it were connected before, it should be reconnected afterwards.

Thanks!
 
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