High Pass Filter Modification Help - Jemsite
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post #1 of 7 (permalink) Old 03-09-2014, 08:59 PM Thread Starter
 
Join Date: Jan 2013
Location: Silver Spring, MD
Posts: 531
High Pass Filter Modification Help

Guys, I need a little help modifying a JS wiring for a build I'm starting. In a post made at www.satriani.com Gary Brawer (http://www.satriani.com/2000/about/gear/controls.shtml) says when pulled, the volume pot bypasses the capacitor that retains the highs, but I believe the general consensus for newer JS guitars is the volume pot actually engages the cap when pulled.

I have two questions:

1. Can you tell me which one of the above is valid for the attached wiring diagram? and

2. If it is a case of "active when pulled", can you help me reverse the operation so that highs are retained normally and bypassed when pulled?

I hope it is a case of moving the capacitor leads one lug down (each), but it has been quite a while since my electronics classes and I would really appreciate the help.
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File Type: jpg JS1200.jpg (16.2 KB, 31 views)
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post #2 of 7 (permalink) Old 03-10-2014, 08:14 AM
 
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Location: France
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Re: High Pass Filter Modification Help

In this diagram, when it is pulled, the cap is connected to the hot point and the wiper.
So this position allows to keep highs when you decrease the volume.

If you want the same thing but with pushed position, change the capacitor wiring on the switch

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post #3 of 7 (permalink) Old 03-10-2014, 09:24 PM Thread Starter
 
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Re: High Pass Filter Modification Help

Thanks Heep,

If I understood your diagram correctly, this older wiring diagram for 94-96 JS6000 & JS1000 shows exactly what you recommended. Can you tell me what is the purpose of second row of lugs on the push-pull pot? Are they always connected, no matter the pot position?

Just to make sure I'm understanding it correctly, when the pot is pushed, lugs on rows 2&3 are connected/closed, and when the pot is pulled, lugs on rows 1&2 are connected/closed. Is that correct?

Thank you again.
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File Type: jpg JS1000.jpg (20.2 KB, 33 views)
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post #4 of 7 (permalink) Old 03-11-2014, 01:21 PM
 
Join Date: Jan 2014
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Re: High Pass Filter Modification Help

Yeah that is right.
However the new diagram you posted shows the opposite if my eyes are not wrong???
Weird... Ibanez mistake or custom switches ?
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post #5 of 7 (permalink) Old 03-11-2014, 01:59 PM Thread Starter
 
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Re: High Pass Filter Modification Help

Quote:
Originally Posted by Heep View Post
Yeah that is right.
However the new diagram you posted shows the opposite if my eyes are not wrong???
Weird... Ibanez mistake or custom switches ?
No, you are correct. The JS 1200 drawing from 2004 and JS 6000/1000 wiring diagram from 1996 show the operation of the volume pot reversed. Looks like the older JS guitars had the filter on when volume pot is pushed, and the newer ones have it on when the pot is pulled, which also falls inline with Gary Brawer's quote in 2000.

Thanks again for your help.
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post #6 of 7 (permalink) Old 03-12-2014, 07:14 AM
 
Join Date: Dec 2000
Location: California
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Re: High Pass Filter Modification Help

One problem is there are some push/pulls that work "upside down" so that pulling them gets you the bottom 4 pins, pushing gets the top 4 pins. If you can beep test the switch you'll know for certain, but I'm just mentioning there's still a chance it'll work backwards with the wrong (right?) push/pull.
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post #7 of 7 (permalink) Old 03-12-2014, 08:24 PM Thread Starter
 
Join Date: Jan 2013
Location: Silver Spring, MD
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Re: High Pass Filter Modification Help

Quote:
Originally Posted by frankfalbo View Post
One problem is there are some push/pulls that work "upside down" so that pulling them gets you the bottom 4 pins, pushing gets the top 4 pins. If you can beep test the switch you'll know for certain, but I'm just mentioning there's still a chance it'll work backwards with the wrong (right?) push/pull.
Thanks. I'll see if I can test the ones I have.
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