4 String 4-In-Line Bass Ratio Open Back Classic Clover Leaf Button (PRB-4401)
4 String 4-In-Line Bass Ratio Open Back Classic Clover Leaf Button (PRB-4401)
PRB-4401-C0
702725245239
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RATIO® patented gear technology
RATIO® - Calibrated Machine Heads incorporate different string gauges into the tuning equation.
From Low E to G - 48:1, 36:1, 25:1, and 23:1.
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.
The PRB-4401 is a right-handed set of RATIO® Calibrated Machine Heads for BASS that use a 4-in-line configuration.
In order to achieve higher gear ratios, Ratio are the world's first machine heads using a double envelope gear design with a hardened steel gear. Amazingly smooth and super strong.
Gear ratio: unique for each string position - one turn-one tone
Peg holes diameter required: 0.720" (18mm)
String post diameter: 0.547" (13.9mm)
String post length to string hole: 0.807” (20.5mm)
Weight per single machine head: 3.5oz (99.3g)
Weight per set of four: 14oz (397g)
String diameter up to 130 gauge
Includes 4 machine heads, mounting screws and bushings
Invisomatch Mounting Plates
InvisoMatch Mounting Plates for RATIO Tuned Machine Heads are the easiest approach to installing Ratio Tuned Machine Heads on your guitar.
Simply select the installation plate design that matches the screw/pin hole location of your factory installed machine heads.
You’ll be up and running within minutes, perfectly installed and aligned. Stay classy you axe master.
For stunning accuracy and response... upgrade to Ratio Machine Heads with it's patented Multi-Geared Tuning Technology.
The new standard in tuning.
NO DRILLING, PERFECT ALIGNMENT, FAST INSTALLATION
With InvisoMatch mounting plates you will reduce the time to install RATIO machine heads to well under 15 minutes.
The alignment of the machine heads is perfect, no holes to drill or fill, ideal for vintage instruments.
Four sets of brushed aluminum InvisoMatch mounting plates come free with every set of Ratio Tuners.
Premium finishes including chrome, nickel, black and gold are available for order.
“After reading some reviews and seeing the ads, I decided to try a set of Graph Tech’s ratio tuners on my American standard Strat. The tuners arrived and I was very pleased with the quality and finish. Installing the tuners was a breeze using the included InvisoMatch plates — no need to drill any holes in my beloved Strat and the performance of these tuners is outstanding!"
"Tuning becomes incredibly easy and holds tune even when using the tremolo bar. I would highly recommend these as a great upgrade to any guitar and will be telling my customers what a great addition they would be for very stable and easy tuning.
Thanks, Graph Tech for a great product.!
Jay Langan / Magdon Music / guitar sales/ guitar tech
Click a picture to open a PDF file with the dimensions.
- ASAlec S.Verified BuyerReviewing3+3 Ratio Electric Guitar Machine Heads (PRN-2311, 2341, please select finish and button style)I recommend this productRated 5 out of 5 stars3 days ago3+3 Ratio Electric Guitar Machine Heads (PRN-2311, 2341, please select finish and button style)
Purchased the gold machine heads, they are brilliants and fit well. No issues.
- RJRyan J.Verified BuyerReviewing6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)I recommend this productRated 5 out of 5 stars1 week agoBest tuners ever
These are the best tuners I've ever used. The ratio concept is brilliant! The ONLY thing that would make these better is if they were auto-locking instead of manual screw-down. Otherwise, they're perfect! Unless you're committed to vintage spec on a vintage instrument, you should get these tuners!!!
- KHKirk H.Verified BuyerReviewing7 Strings: 4+3 RATIO Electric Locking Machine Heads (PRL-8521, SELECT FINISH)I recommend this productRated 5 out of 5 stars1 week agoGlad I chose these first!
These are just amazing tuners. The gear ratios are damn near the best thing since sliced bread. Seriously. I'll eventually be outfitting all of my guitars with these for sure! ⭐x1000
- KSKenneth S.Verified BuyerReviewing6-In-Line Ratio Electric Locking Machine Heads (PRL-8721, 8731, Select Finish and Button Style)I recommend this productRated 5 out of 5 stars1 week agoTuners
Excellent quality!
- AGAndy G.Verified BuyerReviewing3+3 Ratio Acoustic Open Back Tuners (PRN-3411, Select Finish)I recommend this productRated 5 out of 5 stars3 weeks agoBeautiful
I will be installing these on my new Martin very touchy on the low E and A String they will go either past or under but not exactly on I love the gear ratios that are different for each string they're not only functional but they're all so beautiful thank you guys all my guitars are going to get these tuners