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Graph Tech

collapse expand iconDescription

The Graph Tech Ratio 3+3 Retro tuning machine heads deliver predictable, precise tuning, on every string. Each string reacts the same to any tuning adjustment. Graph Tech has balanced the gear ratios to each string, which simplifies the tuning process. With Ratio tuners, a half turn is a semi-tone. The Graph Tech PRN-4424 is a right-handed set of open Ratio calibrated machine heads that feature a retro look and are made for vintage-style electric guitars that use 3+3 side tuners.

As a note, Graph Tech’s retro tuners are made to a vintage specification (for 11/32" peghead holes) and will not be a direct replacement for a modern tuner.
Graph Tech Ratio 3+3 Retro Tuning Machine Heads Nickel 6 String

collapse expand iconFeatures

  • Includes:
  • 6 machine heads
  • Mounting screws
  • Bushings

collapse expand iconSpecs

  • Gear ratio: 39:1, 24:1, 20:1, 35:1, 20:1, 12:1
  • Peg holes diameter required: 0.346" (8.8mm)
  • String post diameter: 0.236" (6mm)
  • String post length to string hole: 0.827" (21mm)
  • Weight per single machine head: 0.056lbs (25.5g)
  • Weight per set of six: 0.338lbs (153g)
  • String diameter up to 72 gauge

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  • submitted2 years ago

    asked byCasey

    fromLos Angeles

    Will these work or be a direct replacement on the inspired by Gibson J45 and or the inspired by Gibson Hummingbird?

    Will these work or be a direct replacement on the inspired by Gibson J45 and or the inspired by Gibson Hummingbird?

    Open Reply - Gear-Support
    Probably but it would need to be tested. These are generic, not branded. In a case like this we recommend having a qualified guitar tech look at the guitar.