Author Topic: Excessive curvature on GK pickup in the GC-1?  (Read 263 times)

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Offline DarthWombat

Excessive curvature on GK pickup in the GC-1?
« on: February 10, 2017, 02:53:13 PM »
G'day all...

I recently acquired a second-hand Fender/Roland GC-1 guitar, having used a Graphtech-equipped Godin Freeway SA and a GK-3 for the better part of a decade. Despite the Strat being quite a reasonable axe, I am not entirely happy with the factory GK setup, so I was wondering if anyone out there might be able to offer some advice.

The radius of the top of the GK pickup is way smaller than that of the fretboard, so I can't get the outside strings close enough to the pickup without the middle ones being way too close. I can compensate for this to some extent using the sensitivity settings, but I was wondering if anyone else had a solution for  the same issue on the GC-1. I notice that my GK-3 has a much greater radius which better matches the fretboard on the FrankenStrat on which it's mounted.

I have already had the onboard GK-2 pickup apart while when I had to go under the scratchplate to fix a manufacturing issue where inadequate wood clearance prevented the GK from being lowered (Grrr!). From that inspection, it looks like I could try removing the white plastic cover to expose the mini-humbuckers (like on the GK-3) and get them closer to the strings. Also, the circuit board on which the pickups are mounted is flexible and mounted on a curved backing plate, so I could try fabricating a flatter backing plate. I reckon these modifications should be reversible - any comments or suggestions?

Thanks in anticipation,

Alex.
Synth guitars: Godin Freeway SA, Roland GC-1 Strat, Ibanez BL-100 FrankenStrat with GK-3
Roland/Boss Synth & COSM gear: Boss GT-8, Roland GR-20, Roland GR-55

Offline sec6

Re: Excessive curvature on GK pickup in the GC-1?
« Reply #1 on: February 10, 2017, 04:16:48 PM »
This worked for me:  I used the GC-1 gk pickup as a radius gauge for adjusting the saddles.  Get your low E and high e adjusted to 4/64ths of an inch above the 12th fret.  Then raise the GK pickup on both sides so that it just touches the low E and high e strings.  Then lower the remaining inside string saddles until they too just touch the top of the GK pickup.  Then once this is done, lower the pickup by milimeter measuring the outer E and e strings.  Do not measure the gk distance while pressing down on the last fret as you want to compensate for the thickness of the plastic cover.  Action across the strings should now be 4/64ths at the 12th fret.  The radius of the GC-1 neck is 9.5 inches and I believe the radius of the GC-1 pickup plastic cover to be the same. 
« Last Edit: February 10, 2017, 04:25:11 PM by sec6 »
Les Paul DC Standard (GK Kit), Ibanez RG420GK, Boss GP-10, Ableton 9 Intro, Omnisphere 2, Arturia Synclavier, Arturia VDM

Offline DarthWombat

Re: Excessive curvature on GK pickup in the GC-1?
« Reply #2 on: February 10, 2017, 11:17:07 PM »
Thanks, sec6 - I'll give that a go.

I normally try to get my action the way I like it (low), and then adjust the pickups, but I may have to revise my approach for the GK.

It's probably an optical illusion, but the pickup radius definitely looks tighter than the fretboard. I'll have to dig out my radius guages to double-check my eyes.  :)
Synth guitars: Godin Freeway SA, Roland GC-1 Strat, Ibanez BL-100 FrankenStrat with GK-3
Roland/Boss Synth & COSM gear: Boss GT-8, Roland GR-20, Roland GR-55

Offline alexmcginness

Re: Excessive curvature on GK pickup in the GC-1?
« Reply #3 on: February 11, 2017, 06:36:13 AM »
I bought one of these to set my action. Its supposed to be for slotting nuts but it can be used for measuring action as well.

http://www.stewmac.com/Luthier_Tools/Tools_by_Job/Tools_for_Nuts_and_Saddles/Nut_Slotting_Gauge.html
VG-88V2, GR-50, GR-55, 4 X VG-99s,2 X FC-300,  2 X GP-10 AXON AX 100 MKII, FISHMAN TRIPLE PLAY,MIDX-10, MIDX-20, AVID 11 RACK, BEHRINGER FCB 1010, LIVID GUITAR WING, ROLAND US-20, 3 X GUYATONE TO-2. MARSHALL BLUESBREAKER, SERBIAN ELIMINATOR AMP.

 

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