Pickup question

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Pickup question

Postby Happy Face » Wed Feb 09, 2011 11:21 am

Now, why would a bass with two (single coil) pickups and one tone control be so much noticeably louder when the volume on either pickup is on 10, which seems to turn off the other pickup. When you blend them each below 10, it is much quieter??

I encountered this with a Yamaha BX-1 I sold and now on a mash-up bass i just acquired.

I do not encounter this on my Guild, which has two single coils and two tone pots. When i play it, I leave the tone pots alone and just change the blend between pickups to change the tone. Works well. It only gets slightly louder when the vol on one pup is up all the way, crowding the other off.

I'm wondering if the single tone pot is the isue or if it is something else?

Thanks!
Happy Face
 

Re: Pickup question

Postby Golem » Fri Feb 11, 2011 8:42 pm

`

I feel certain that if you post this question to TBL [The Bottom Line] on
Yahoo Groups you will get a real, and comprehensible, explanation. They
have that kind of wizzids there.

My own theory for this common occurance is that as long as your volume
pots are NOT dimed, they are bleeding some signal to ground and that
ground is shared by the cap on the tone pot. Then when you dime either
pot, the cap is not involved.

For that to make sense, you hafta realize that volume pots are not in-line
resistance but are employed to govern how much signal gets bled off to
ground, via a piece of wire. A tone pot is just the same, except that the
piece of wire includes a cap to cause it to bleed off highs earlier than lows.
IOW, when you dime a pot, the pot is not at zero resistance but is at max
resistance. The pot is NOT an "adjustable gate" directly in the signal path.
It's an adjustable gate in the path to ground.

Now, why you found that having parallel tone pots/caps is different than
grounding [really partial grounding] both PUs thru a common pot+cap ....
thaz for the TBL wizzids to esplain. But ... consider that electricity [your
signal] is always seeking the easiest path to ground. If the volume pot is
set to limit a signal's path to ground, some of that signal will seek to go
to ground thru the tone pot+cap. If you have seperate tone pots/caps for
each PU, the "ground-deprived" PU [the one set louder] cannot leak signal
to ground thru the other PU which, in the typical V-V-T [1 tone pot] config,
would be an availalble path to ground, since the not-set-so-loud PU would
be bleeding somewhat to ground. Just my thoughts.


`

New basses are red. Used basses are black.
- - ---- -- - --- - - - --- - ---- -- - - --- - -- - -

In a perfect world
At the end of the day
Tomorrow never comes.
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Golem
 

Re: Pickup question

Postby Happy Face » Fri Feb 25, 2011 6:53 am

Thanks Golem!! I just realized that I had forgotten to post a thank you. [smilie=icon_redface.gif]

That explanation makes great sense, even to this blockhead.
Happy Face
 

Re: Pickup question

Postby Golem » Mon Feb 28, 2011 7:17 pm

`

You're welcome.

BTW I actually dusted off my dusty BX-1 and altho it
has typical "symptoms" when set to single coil mode
my own BX-1 did not have it any worse than most any
typical jazz bass. Maybe yours was a problematic or
unusual example. I'm not all that fond of jazz basses
in general. as I'm sorta intolerant of single coil noise.
The JJ basses I do enjoy have noise canceling PU's.


`

New basses are red. Used basses are black.
- - ---- -- - --- - - - --- - ---- -- - - --- - -- - -

In a perfect world
At the end of the day
Tomorrow never comes.
User avatar
Golem
 


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