Item #1154880 Model #HR-4.6AP/918

Bartolini HR-4.6AP/918 3-Band NTMB+F Preamp, 4 Pots Standard


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An easy way to give your guitar a more professional setup.

Bartolini's most popular preamp for decades, the NTMB+F is a 3-band tone control preamp with fully independent Bass, Mid and Treble controls. It is well known to professionals for its very low noise and wide boost and cut range for aggressive control. The voice is clear, transparent and strong. The treble frequency is set high for maximum available brightness.

A professionally pre-wired and fully pre-tested harness saves the time and aggravation of wiring your preamp and pots into your instrument. Wired with Bartolini's pro-level preamp and premium audio-quality pots and switches, you’ll have smooth control and be ready for years of rugged use. Included battery clips and an output jack make for quick installation. All the pots are grounded with a wire that can be connected to the cavity shield or simply cut away if not needed in your installation. Everything is pre-soldered with pro-quality pure copper wire that is double tin-plated and protected with semi-rigid insulation so it won’t flop around in the cavity or degrade over time. Bartolini uses only professional lead-free solder with non-corrosive flux. Knobs are a personal choice, so they are not included with the harness – except where there is a stacked (concentric) pot, Bartolini includes a ring knob and center knob since they are not as common.
Preamp Module Size
  • 1.76" [44.7mm] L x 1.02" [25.9 mm] W,x .54" [13.7 mm] D
Operating Voltage
  • 9V or 18V - Prewired for 9V. An additional battery clip is included for 18V wiring


  • The 918 uses a 3-band EQ and preamp
  • Two holes for volume control: Volume (with Active/Passive push-pull switch) - Blend
  • Two holes for tone control: Treble/Bass Stack - Mid (with two freq push-pull)