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6-In-Line Ratio Electric Locking Machine Heads Staggered Posts (PRL-9721, Select Finish and Button Style)

6-In-Line Ratio Electric Locking Machine Heads Staggered Posts (PRL-9721, Select Finish and Button Style)

PRL-9721-C0

702725245444

Regular price $160.94 USD
Regular price Sale price $160.94 USD
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Select Finish
Select Button Style

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

The PRL-9721 is a right-handed set of Locking RATIO® Calibrated Machine Heads for electric guitar that use 6-in-line tuners with staggered posts (eliminates the need for a string tree).

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 Staggered tuners set Ratio Tuned Machine Heads: The New Standard In Tuning Technology

 

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: 0.827” (21mm) - 0.787" (20mm) - 0.748" (19mm)
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

 

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

 

Nacho

Reviewed in the United States on February 16, 2020

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5.0
Rated 5.0 stars
Based on 10 reviews
Total 5 star reviews: 10 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
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10 reviews
  • KR
    Kent R.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    2 days ago
    Beautiful, precise mechanism

    The machine heads are absolutely flawless visually. My neck is still in production so at this point I can only comment on how they look out of the box and how smooth the mechanism seems.

  • WC
    William C.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    4 weeks ago
    Ratio’s are the best.

    I put them on all my keepers. They really make tuning easier for all tunings. I tune by ear when I practice it’s so natural, and I never forget where I’m at.

  • SS
    Steven S.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    1 month ago
    These machine heads rule!

    Had to do a little modifying but they were worth it!

  • EM
    Ed M.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    1 month ago
    Excellent tuners, possibly the best on the market right now - if you like easily and precisely staying in tune

    I had previously upgraded my stock tuners on my Tele to locking Fender tuners. Decent enough hardware but there was a small amount of mechanical slop in the gears. Not a lot, but some. The gear ratio meant it was slow to get it precisely in tune.

    It's perfectly doable to go down and then tune up to pitch to keep tension on the string, but doing that is slow because the imprecise gearing and mechanical slop means you have to either take a few tweaks, or else slowly creep up to not overshoot. I use a strobe tuner and play clean chordal tones so being slightly out of tune is noticeable.

    The new Ratio tuners are noticeably more consistent and its much faster to hit exact tune in one twist. No more overshoot or creeping up to tune. Good stuff. Works just as advertised.

  • VA
    Vernon A.
    Verified Buyer
    I recommend this product
    Rated 5 stars
    2 months ago
    Tuners

    Will stay in tune even changing climate. Thanks

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