Radial SB-15 Tailbone Combination Buffer Converter

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Write a review Q&A SKU: SB-15-TAILBONE Solotech ID#: 57171
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Regular price $99.99 USD

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Radial SB-15 Tailbone Combination Buffer Converter

Signal Buffer & 9V to 15V converter

The Stagebug SB-15™ is a class-A signal buffer designed to sit at the beginning of the signal chain and drive multiple pedals without added noise or signal loss. It also converts two 9V power outputs to a 15V supply as an alternative way to power Radial and Tonebone 15V products.

Drive pedal chains with ease
The SB-15 is an ultra-compact signal buffer that is pedalboard friendly, with transparent operation that maintains the natural tone of your instrument. Unlike many audio designs that employ ICs or integrated circuits to buffer the signal, the 100% discrete class-A design of the SB-15 reduces the need for phase-cancelling negative feedback produces a more natural and pleasing tone. This is complimented by a Drag control load correction circuit to replicate the tone and feel as if connected directly to the amplifier. Once buffered, the signal is less susceptible to hum and buzz caused by radio interference and electromagnetic fields, and is then able to drive multiple pedals distances of 15 meters (50') without noise.

Power 15V Radial and Tonebone Pedals
The SB-15 Tailbone is powered by a standard 9V supply (not included). As an extra bonus, when using a Tonebone pedal that requires 15V on your pedalboard, you can combine two 9V outputs from your power brick and the SB-15 will convert them to 15VDC and provide the correct voltage polarity. This makes adding a high-end Tonebone or Radial device to your pedalboard easy.

Using the SB-15 as a signal buffer
The SB-15 corrects the load and lowers susceptibility to noise when driving multiple pedals and a distant amp. This makes the SB-15 an ideal front end for your pedalboard and guitar setup.

Using the SB-15 with a power brick
Most power bricks only have 9 volt outputs. The SB-15 makes it easy to power your 15 volt Tonebone by using two 9V outputs. The SB-15 converts the voltage and polarity to suit.

Using the SB-15 on your pedalboard
Use the SB-15 as the ultimate front-end for your pedalboard. Connect the SB-15 to your pedals and amp for less noise and a more natural tone.


  • 100% discrete class-A signal buffer
  • Drag control load correction for natural tone
  • Drives pedal chains up to 15 meters (50ft)
  • Converts two 9V supplies to 15V output
  • Buffer Input
    Hi-Z ¼" guitar connection to the class-A buffer circuit.
  • 9VDC In-1
    Used to provide power to the Tailbone class-A active buffer circuit.
  • 9VDC In-2
    Used with 9VDC IN-1 to increase input power so that the Tailbone can deliver 15 volts to a Tonebone pedal.
  • Enclosure
    Made from 14 gauge steel to protect sensitive electronics inside while shielding against magnetic fields.
  • 15VDC Out
    Special 15 volt 400 milliamp output designed to supply Tonebone pedals using two 9V DC supplies as the power source.
  • Buffer Output
    ¼" output connects to pedals and amp, allows longer cable run without noise.
  • Powder Coat
    Keeps your StageBug SB-15 looking good for years.
  • Drag Control
    Adjust the load on the pickup for more natural sound and feel.
  • Warranty: Radial 3-year, transferable


  • Audio circuit type: Class A FET buffer
  • Frequency response: 20Hz to 30Khz
  • Dynamic range:104dB with dual 9V supply; 98dB with single 9V supply
  • Gain: 0dB (unity gain)
  • Clip Level: +16dBu
  • Total harmonic distortion:0.01% @ 1kHz
  • Intermodulation Distortion: 0.004%
  • Phase Deviation: <5° at 20Hz
  • Input Impedance: 22K to 500K
  • Output Impedance: 4.7K
  • Noise:-88dBu
  • Maximum Input: +16dBu
  • Features
    • Drag Control
    • Input Connectors: Standard 2.1mm barrel with center negative (-)
    • Output Connectors:Standard 2.1mm barrel with center positive (+)
    • Extras: Dual 9VDC 200mA for optimal performance – May be used with single 9VDC supply to power buffer only
  • General
    • Construction: 14-gauge steel
    • Size (L x W x D):4.5" x 1.85" x 1.35" (114mm x 47mm x 34mm)
    • Weight: 0.55lb (0.25kg)
    • Shipping size (L x W x D):8" x 5" x 3" (203mm x 127mm x 76mm)
    • Shipping weight: 0.65 lbs (0.3kg)
    • Power:+15V DC 400mA
    • Conditions: For use in dry locations only between 5°C and 40°C


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