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FDP Forum / Guitar Mods, Repairs, and Projects / Please check my work if you have a moment

wrnchbndr
Contributing Member
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New Jersey

I'm back with the otters again
Jun 27th, 2018 11:52 AM   Edit   Profile   Print Topic   Search Topic

I'm working on an Ibanez LP copy with three humbuckers. The client is installing new pickups, all new controls, new bridge...

He wants to be able to use the middle pickup all by itself so this is my current idea. The two original tone pot locations are replaced by push/pull pots. One pot becomes the middle pickup volume control and the other pot becomes a master tone pot tapping directly from the output jack. The original 3-way switch functions exactly the same as every two pickup LP (Neck, Both, Bridge). Pulling out the knob of the Middle Volume adds the middle pickup signal regardless of the position of the 3-Way switch. Pulling out the Master Tone Knob removes the signal from the 3-Way switch so you can use the middle pickup by itself.

diagram

Te 52

Laws of Physics

strictly enforced
Jun 27th, 2018 01:07 PM   Edit   Profile   Print Topic   Search Topic

You've got the output of the middle pickup going to the bridge volume pot and thence to the selector switch, which I don't think is what you intended.

Could you link us to a revised version?

rockstar_not

USA

Thank God for guitars!
Jun 27th, 2018 01:26 PM   Edit   Profile   Print Topic   Search Topic

Any reason for not going with 3 dpdt each wired for HB on one side, off in the middle, tapped on the other side?

wrnchbndr
Contributing Member
**********
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New Jersey

I'm back with the otters again
Jun 27th, 2018 08:07 PM   Edit   Profile   Print Topic   Search Topic

Revised thanks.
The client wants to keep the original exterior controls.
I believe I once came across an alternative type of Gibson switch made by Switchcraft for the 3 pickup guitars but I can find one of those or a diagram. All I've found were diagrams that only employ the middle pickup with the bridge pickup only yielding neck, neck and bridge, bridge, all three, bridge and middle. The bridge volume pot controls the output of both the bridge and the middle when the middle is engaged via a push/pull. You cannot run neck and middle or middle by itself. My client wants it all but with no change to the look of the controls.
I don't like that there is no output at all if the tone pot is pulled out and the middle volume pot is in.

Revised

wrnchbndr
Contributing Member
**********
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New Jersey

I'm back with the otters again
Jun 27th, 2018 08:15 PM   Edit   Profile   Print Topic   Search Topic

I was also thinking that maybe I should use 1Meg pots -- the combined load of the volume pots is down to 166K when all pickup are switched on. 1Meg puts it at 333K. Thoughts?

DrKev
Contributing Member
******

Paris, France

It's just a guitar, not rocket science.
Jun 28th, 2018 03:32 AM   Edit   Profile   Print Topic   Search Topic

I would only put 1M pots on the tone controls. I don't think you'll need them in all positions, and I think it'll be just fine with the 500k pots. But treble loss at lower volume knob settings is worse if the volume pot is the higher value pot.

Te 52

Laws of Physics

strictly enforced
Jun 28th, 2018 10:55 AM   Edit   Profile   Print Topic   Search Topic

Your wiring is good.

I would suggest one small enhancement: As configured now, if the player is using N and B and wants to switch to M only, he must throw two switches; turn N and B off, and add M. Instead, when you turn N and B off, why not have that automatically turn M on, regardless of the position of the Add M push-pull?

It's very easy to do, doesn't even require using the second pole of the N&B Off switch. Mod at link. I didn't show all the grounds, you know where they go.

suggested mod

(This message was last edited by Te 52 at 12:57 PM, Jun 28th, 2018)

wrnchbndr
Contributing Member
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New Jersey

I'm back with the otters again
Jun 28th, 2018 11:05 AM   Edit   Profile   Print Topic   Search Topic

Your mod is a decent improvement. Much thanks for taking the time.

rockstar_not

USA

Thank God for guitars!
Jun 28th, 2018 11:24 AM   Edit   Profile   Print Topic   Search Topic

Another option to make it simpler would be a slider switch mounted on the rear electronics cavity cover which would be middle pup on switch. I actually did this mod for the tail pup on my Epiphone Nighthawk Reissue which is a 3 pup guitar with a strat style 5 position switch. I get all the strat options and neck/tail as well as all 3. No appearance change on the front of the guitar which has no pickguard.

wrnchbndr
Contributing Member
**********
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New Jersey

I'm back with the otters again
Jul 3rd, 2018 09:03 AM   Edit   Profile   Print Topic   Search Topic

Hey. It works and it works well. Thanks friends.

Rockstar, If it were my own guitar, I would have done as you suggested but then, I'm not a fan of playing LPs. Cutting the little square hole is a pain and this is a profit making project. We got it working and all of the client's desires have been met.

This was a neglected and abused guitar that probably hadn't seen new strings for 15 years. Full of little detail work requirements and they all add up. An old Ibanez Gibson copy, you don't know if a standard bridge and tailpiece is going to fit properly without complication. Got lucky and the new studs for both the new bridge and the tailpiece fit the original inserts. Looking at a guitar like this, you can't tell whether or not it'll cross the finish line as a worthwhile endeavor - so many things can become labor sucking issues. At this point, The only thing I need to do is thin down the heck pickup's trim ring because its too tall and interferes with the high E-string at the last six frets. Simple job but things like this add cost to the job.

FDP Forum / Guitar Mods, Repairs, and Projects / Please check my work if you have a moment




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