Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style) - Graph Tech Guitar Labs Ltd.
Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.
Ratio Electric Locking Machine Heads 6 in-line (select finish and button style) - Graph Tech Guitar Labs Ltd.

6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)

PRL-8721-C0
5.0
Rated 5.0 stars
6 Reviews

Select Finish
Select Button Style

SCIENCE BEHIND RATIO:

RATIO® patented gear technology
RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.

From Low E to High E 39:1, 24:1, 20:1, 35:1, 20:1, 12:1.

We balanced the gear ratios to each string simplifying the tuning process.

With RATIO®, a half turn is a semi-tone!

Every string reacts the same to any tuning adjustment. Predictable, precise tuning, on every string.

RATIO Machine Heads explanation video

 

Description:

The PRL-8721 and PRL-8731 are a right-handed sets of Locking RATIO® Calibrated Machine Heads for electric guitar that use 6-in-line tuners.

It has a two pin casing that can be used as is, or with our Patented InvisoMatch Mounting Plates [opens in new tab].

4 different sets of InvisoMatch mounting plates in brushed aluminum are included to make installation on most guitars fast and accurate by using your existing screw mounting holes.

 

6-in-line tuners set  Ratio Tuned Machine Heads: The New Standard In Tuning Technology

 

Specification:

Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 13/32" (10mm)
String post diameter: 0.236" (6mm)
String post length to string hole: 0.910” (23mm)
Weight per single machine head: 0.083lbs (38g)
Weight per set of six: 0.496lbs (225g)
String diameter up to 72 gauge
Includes 6 machine heads, mounting screws and bushings
Includes complimentary 4 sets of aluminum mounting plates

GUIDES:

Staggered Ratio Measurements.pdfRatio Installation Guide.pdfRatio Installation Guide Video

REVIEWS:

Moss Hart

Reviewed in the United States on February 15, 2020

Amazon Verified Purchase

 

5.0
Rated 5.0 stars
Based on 6 reviews
Total 5 star reviews: 6 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
Customer-uploaded media carousel. Press left and right arrows to navigate. Press space or enter to open more details.
Slide 1 selected
6 reviews
  • RM
    Russell M.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    1 month ago
    Custom guitar build

    High quality parts, very satisfied.

    Was this helpful?
  • ES
    Edward S.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    1 month ago
    As advertised

    These tuners do what they say they do. There isn't much else to say.

    Was this helpful?
  • GG
    George G.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    2 months ago
    They Fit G & L Bluse Boy

    Before making my purchase, I tried fitting my Fender Telecaster MH to my G & L Bluse Boy, and the pin holes we off by 1/32. I was certain that I would be using one of the universal mounting plates. When my Graphtech MH arrived, they were a perfect match to my Bluse Boy, no plate was needed. Many thanks guys!

    Was this helpful?
  • GF Profile picture for Gene F.
    Gene F.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    2 months ago
    GraphTech - GUITAR LABS says it all.

    I think my new locking machine heads awesome.

    Everything on your website hit the nail on the head. The descriptions of the product and installation went just as easily as promised. You've used knowledge and technology and brought it to guitar players who are out there living their dreams.

    Was this helpful?
  • CB
    Chris B.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    3 months ago
    Exceeded Expectations

    These tuners are amazing. This year I switched from using Floyd Rose fine tuners to fixed bridge guitars with regular machine heads and doing an ultra-accurate tuning job with regular machine heads just hasn't been possible. After searching for "fixed bridge fine tuners", I learned about gear ratios and locking tuners, and specifically these Graph Tech Ratio locking tuners. After installing these, I noticed an immediate improvement in tuning accuracy and stability, fine tuning is now possible, and changing strings has never been easier with the locking feature (I'm actually looking forward to it next time). Installation on my Jackson JS32T Warrior was very easy and required no drilling thanks to the mounting plates. I can't imagine playing another guitar without these.

    Was this helpful?
Reviews LoadedReviews Added

x
x