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FDP Forum / Guitar Mods, Repairs, and Projects / DANGER Will Robinson, DANGER!

Tinkerer
Contributing Member
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San Diego, CA USA

Feb 2nd, 2019 08:02 PM   Edit   Profile  

It is raining cats and dogs here in So Cal today, so I stayed indoors and messed around in my shop. I decided to work on a guitar I made a couple of months ago- this particular one started out as a single Kinman P90 Nasty version pickup located in the middle position. I liked the sound, but it seemed like a bit of the treble bite was lost having it that far away from the bridge. A couple of weeks ago I added a bridge position rout for another pickup, and have tried a couple of GFS's Tele bridge pickups that I have in my parts bin. Their Lil' Puncher, matched the Kinman's volume, but the sounds were so similar, I thought "What's the point". The other GFS- a Neovin didn't come close to matching the Kinman's volume, and I did not want to lower the Kinman and lose some growl.

I decided to go back to having the Kinman as the solo pickup in the guitar, but moving it to the bridge position for more of a Les Paul Junior kind of vibe. I know that with the bolt on neck and longer scale length I could at best get close to the sound of a Junior, but thought I would give it a go.

That meant some additional routing and having to deal with a resulting swimming pool kind of space in the top of the guitar. I wanted to do something different and not do a pickguard to cover the excavation, and this is where I got to. The tube is decorative, and I made a thin polycarbonate sheet that curves over that rout to afford the tube a bit of protection.

http://www.fenderforum.com/userphotos/index.html?recid=85113

(This message was last edited by Tinkerer at 10:35 PM, Feb 2nd, 2019)

Therealfrogman
Contributing Member
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Pueblo, Co

I qualify!
Feb 2nd, 2019 08:27 PM   Edit   Profile  

There is no pic for some reason...

Tinkerer
Contributing Member
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San Diego, CA USA

Feb 2nd, 2019 08:36 PM   Edit   Profile  

That's odd- I just clicked on the link in the post and the photo came right up.

wrnchbndr
Contributing Member
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New Jersey

I'm back with the otters again
Feb 2nd, 2019 09:12 PM   Edit   Profile  

I'm thinkin about two 3/16 rods in parallel and a mount for your P90 that allows you to slide the pickup from bridge to middle position and every point in between.


Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Feb 2nd, 2019 09:20 PM   Edit   Profile  

That looks cool!

A thing you could add is a blue LED under the tube, powered by a 9v battery and step-down resistor that activates via a stereo output jack so it comes on only when a plug is popped into the guitar.

Mick Reid
Contributing Member
*****

Australia

American-made in Oz!!
Feb 2nd, 2019 10:18 PM   Edit   Profile  

I'd like to see it, but I get no pic either :^(

Shows as a broken link/missing image icon.

I even tried viewing through your profile. Nothin'


windmill
Contributing Member
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Australia

older,better
Feb 2nd, 2019 10:28 PM   Edit   Profile  

Looks good to me !

Tinkerer
Contributing Member
****

San Diego, CA USA

Feb 2nd, 2019 11:15 PM   Edit   Profile  

Thank you for the feedback and the ideas guys!! I have thought about a sliding mount system for it- I've seen posts about that kind of thing on the forum before. I really like how the pickup sounds in the bridge position, so if I keep this setup, it would be cool to light the tube.

Retry on the link

Fenderookie
Contributing Member
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Lafayette, IN

Feb 3rd, 2019 04:16 AM   Edit   Profile  

pic works for me......I likey

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Feb 3rd, 2019 04:33 AM   Edit   Profile  

Westone (IIRC) used the sliding pickup on a headless bass in the 80s. I'm gonna see if I can find a pic.

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Feb 3rd, 2019 04:35 AM   Edit   Profile  

It was called The Rail bass, made in Japan by Matsumoku for Westone.

Very high quality, despite its futuristic quirkiness.

Only in the 80s!

(This message was last edited by Peegoo at 06:39 AM, Feb 3rd, 2019)

Leftee
Contributing Member
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VA

Toxic Humility
Feb 3rd, 2019 06:53 AM   Edit   Profile  

I like it!

vomer
Contributing Member
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Two layers bar tape

And a triple chainset
Feb 3rd, 2019 10:06 AM   Edit   Profile  

Neat, I like it too.

M Tracy
Contributing Member
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Lafayette IN

Feb 3rd, 2019 10:31 AM   Edit   Profile  

Very nice and that pickup is just awesome, at least it is in a Jr.

Tinkerer
Contributing Member
****

San Diego, CA USA

Feb 3rd, 2019 10:40 AM   Edit   Profile  

Thank you all. I have been playing it this morning and really like the way it sounds- looking forward to taking it to band practice this week and seeing how it shows up in the mix.

Peegoo- thanks for the photo, one of the things I have been wondering about for a system like that would be how to come up with a low enough profile rail mechanism to fit in the cavity- this guitar body is thinner: 1 1/2" thick, so real estate is a bit limited string to pickup distance wise. I have an idea about how I could do a quick change mechanism to lock the "sled" once the position is set- essentially a spring loaded screw with the spring pushing the screw down into the base of the cavity- pull up on the screw to compress the spring and slide, etc, but I don't have room in the bottom of the cavity for a rail assembly. As it is now, the bottom of the pickup is only about 1/8" from the cavity floor surface.

My initial idea for an easy way to have adjustable pickup placement was to line the cavity with velcro, and have mating velcro on the bottom of the pickup. I think this would work, but I thought that with the fuzzy velcro side in the cavity, the cavity bottom might look like the carpet remnant that you would have seen in the back of a garage band touring van in the late '70's. I was not able to decide if that would be a great look, or a really cheesy look. Although that would set me up to be able to say: "If the guitar is a rocking..........."

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Feb 3rd, 2019 07:40 PM   Edit   Profile  

How about screwing a thin steel plate into the floor of the rout, and then epoxy some small neo magnets to the base plate of the pickup?

Make sure the neo mags are the same orientation as the poles in the pickup, e.g., north up and north up.

That would allow you to place the pickup anywhere in the cavity, as well as tilt it (a la Tele and Strat bridge pickups) in any direction you like.

Tinkerer
Contributing Member
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San Diego, CA USA

Feb 3rd, 2019 10:22 PM   Edit   Profile  

That is a cool idea Peegoo!! How would the neo magnets affect the sound of the pickup- would they change the intensity of the magnetic field in the pickup? Would such magnets impact the Kinman pickups differently than a standard pickup?

Thanks!!

Leftee
Contributing Member
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VA

Toxic Humility
Feb 3rd, 2019 10:56 PM   Edit   Profile  

Absolute madness!
















I love it!

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Feb 4th, 2019 06:43 AM   Edit   Profile  

It might make the pickup a bit louder because it would increase the size of the magnetic field surrounding the coil.

The one thing we can be sure of is how the steel plate, in contact with the magnets, increases the inductance of the pickup's coil. That translates to an increase of lows and mids in the signal; it warms up the tone a bit. It's the reason why Fender added a steel or copper plate (brass works too) to the base of the Tele bridge pickup--to tame the spiky highs.

Steel and iron are ferromagnetic, and magnets stick to 'em. Although copper and brass are non-ferrous and magnets don't stick to 'em, they perform similarly to steel because they're paramagnetic, which means they exhibit qualities similar to ferrous metals but only in proximity to a fluctuating magnetic field (see link below).

I have modified cheap ceramic pickups by removing the large ceramic bar magnet and using CA to attach a line of 6x12x1 mm neo magnets to the bottom of the bobbin. I thought it would radically change the tone of the pickups, but they sounded pretty much the same. I've done this with P90s, SCs, and humbuckers.

There's no way to know exactly how it would affect the sound, so if you have some no-name pickups knocking around in the parts bin, make a prototype as a proof of concept to see how it changes the unit's original sound.

You will have to accommodate for pickup height- -some shim material between the pickup and the magnet--to maintain proper spacing between the pickup and strings.

Looks like witchcraft, but it's Lenz's Law :o)

wrnchbndr
Contributing Member
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New Jersey

I'm back with the otters again
Feb 4th, 2019 08:00 AM   Edit   Profile  

Ah... with a floor of neos you could probably remove the magnets from the P90... Gotta try this myself.

You need to be careful about the proximity of your wallet and your ATM cards

(This message was last edited by wrnchbndr at 10:01 AM, Feb 4th, 2019)

FDP Forum / Guitar Mods, Repairs, and Projects / DANGER Will Robinson, DANGER!




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