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Post subject: converting jazz controls to volume/blend/tone
Posted: Sun Apr 03, 2011 5:03 am
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I want to convert a passive jazz from the usual volume/volume/tone setup to volume/blend/tone. Has anybody done this? Not sure what problems I might face. If anyone can post a schematic that would be great.


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Post subject: Re: converting jazz controls to volume/blend/tone
Posted: Sun Apr 03, 2011 5:01 pm
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fretless5 wrote:
I want to convert a passive jazz from the usual volume/volume/tone setup to volume/blend/tone. Has anybody done this? Not sure what problems I might face. If anyone can post a schematic that would be great.


Here you go:

http://www.stewmac.com/freeinfo/Electro ... -4137.html

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Post subject: Re: converting jazz controls to volume/blend/tone
Posted: Mon Apr 04, 2011 8:51 am
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Most passive basses are wired such way.

I've had a Yamaha RBX350 with the volume/pan/tone controls you're talking about.

Usually a pan pot has a center detent which clicks in the middle position when both pickups are engaged, creating a scooped "growling" sound which many players - such as Marcus Miller and Will Lee - use for slap bass playing.

The Jazz Bass growl occurs when certain frequencies from both pickups being out of phase and cancelling each other, leaving a "scoop" on the midrange.


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Post subject: Re: converting jazz controls to volume/blend/tone
Posted: Mon Apr 04, 2011 9:08 am
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chromeface wrote:
Most passive basses are wired such way.

I've had a Yamaha RBX350 with the volume/pan/tone controls you're talking about.

Usually a pan pot has a center detent which clicks in the middle position when both pickups are engaged, creating a scooped "growling" sound which many players - such as Marcus Miller and Will Lee - use for slap bass playing.

The Jazz Bass growl occurs when certain frequencies from both pickups being out of phase and cancelling each other, leaving a "scoop" on the midrange.


Naturally, both pickups' coils must be RW/RP to the other in order for the circuit to be humbucking where to which degree they are humbucking is determined by the DC resistance balance between them. Actually, what is going on is, in the detent position, both pickups are on equally but at half of their full output capability. In other words, both are on '5' rather than on '10'. Hence, a weaker, crisper tonality is heard.

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Post subject: Re: converting jazz controls to volume/blend/tone
Posted: Tue Apr 12, 2011 7:33 pm
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Martian wrote:
chromeface wrote:
Most passive basses are wired such way.

I've had a Yamaha RBX350 with the volume/pan/tone controls you're talking about.

Usually a pan pot has a center detent which clicks in the middle position when both pickups are engaged, creating a scooped "growling" sound which many players - such as Marcus Miller and Will Lee - use for slap bass playing.

The Jazz Bass growl occurs when certain frequencies from both pickups being out of phase and cancelling each other, leaving a "scoop" on the midrange.


Naturally, both pickups' coils must be RW/RP to the other in order for the circuit to be humbucking where to which degree they are humbucking is determined by the DC resistance balance between them. Actually, what is going on is, in the detent position, both pickups are on equally but at half of their full output capability. In other words, both are on '5' rather than on '10'. Hence, a weaker, crisper tonality is heard.

I apppreciate the response but somehow, if I understand you correctly, this doesn't reflect what I hear on my active deluxe Jazz with its factory blend control. I usually play with the blend a little "bass" of center, which is too say not exactly on the center detent. The sound is not scooped at all to my ears but rather a nice blend of both pickups. Maybe the active circuit compensates for the mix between the two pickups?


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Post subject: Re: converting jazz controls to volume/blend/tone
Posted: Wed Apr 13, 2011 7:19 am
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fretless5 wrote:
Martian wrote:
chromeface wrote:
Most passive basses are wired such way.

I've had a Yamaha RBX350 with the volume/pan/tone controls you're talking about.

Usually a pan pot has a center detent which clicks in the middle position when both pickups are engaged, creating a scooped "growling" sound which many players - such as Marcus Miller and Will Lee - use for slap bass playing.

The Jazz Bass growl occurs when certain frequencies from both pickups being out of phase and cancelling each other, leaving a "scoop" on the midrange.


Naturally, both pickups' coils must be RW/RP to the other in order for the circuit to be humbucking where to which degree they are humbucking is determined by the DC resistance balance between them. Actually, what is going on is, in the detent position, both pickups are on equally but at half of their full output capability. In other words, both are on '5' rather than on '10'. Hence, a weaker, crisper tonality is heard.

I apppreciate the response but somehow, if I understand you correctly, this doesn't reflect what I hear on my active deluxe Jazz with its factory blend control. I usually play with the blend a little "bass" of center, which is too say not exactly on the center detent. The sound is not scooped at all to my ears but rather a nice blend of both pickups. Maybe the active circuit compensates for the mix between the two pickups?


That's the difference between active and passive. See, with the active, the pre-amp kicks in and compensates for that loss in volume and frequency response. I interpreted your question as if you were planning on using a pan pot with a passive circuit.

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