Skip to main content Skip to footer

Radial Engineering Logo

Radial Engineering SB-15 Tailbone High Performance Signal Buffer

  • Write a Review

The Radial SB-15 Tailbone is a high-performance signal buffer designed to reside at the beginning of the signal chain and drive multiple pedals witho...Click To Read More About This Product

Available 04-09-2018

Gold Coverage: (What’s This?)
    Warranty Options

  • Shipping (48 Contigous U.S. States)
  • Your Price :
  Reserve Now Notify Me When This is in Stock
Add to Wish List

Earn up to 400 reward points.


Keeps noise to a minimum in numerous playing environments.

The Radial SB-15 Tailbone is a high-performance signal buffer designed to reside at the beginning of the signal chain and drive multiple pedals without the added noise that often plagues high impedance circuits.

The ultra-compact design begins with a standard Hi-Z instrument input. The signal is then 'tamed' using Radial's unique Dragster load correction circuit to replicate the tone and feel as if connected directly to the amplifier. The signal is then buffered via a 100% discrete, class-A unity gain amplifier. Unlike most others that employ ICs or integrated circuits to buffer the signal, the discrete design reduces the need for phase-cancelling negative feedback producing a more natural and pleasing tone. This is further advanced with the same award winning class-A buffer that is in the Radial JD7 and used by guitarists as diverse as Steve Vai, John Petrucci, Steve Lukather and many others. Once buffered, the Tailbone lowers the impedance and susceptibility to hum and buzz caused by radio interference and electromagnetic fields. The SB-15 is then able to drive multiple pedals distances of 15 meters (50') without noise.

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

The Radial SB-15 Tailbone delivers exceptional sonic quality, reduces noise and adds the convenience of 15VDC power for your Tonebone.

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

Active direct box for acoustic guitar
Ultra compact to fit in your guitar case
Plug & play easy to use feature set
48V phantom powered, no batteries needed!

Order today and minimize your noise floor.

Audio circuit type: Active Buffer with Phase Splitter
Frequency response: 20Hz to 20KHz
Total harmonic distortion: <0.006%
Dynamic range: >100dB
Input impedance: 800K/23K
Maximum input: +2dBu/+8dBu
Gain: +1.3dBu/+4.4dB
Clip Level - Output +3.3dBu/+12.3dBu
Output impedance: 330 Ohms
Equivalent input noise: -101dBu
Noise floor: -97dBu
Intermodulation distortion: <0.01%
Phase deviation: 25/12 degrees Maximum
Switches: Pad, Phase
Merge function: Automatic
Input pad: -12dB
Polarity: Yes
XLR configuration: + = Pin 2, - = Pin 3, Ground = Pin 1
Construction: 16 gauge steel chassis & outer shell
Finish: Durable powder coat
Size: (L x W x D) 4.5" x 1,85" x 1.35" (114mm x 47mm x 34mm)
Weight: 0.55 lbs (250 grams)
Shipping Size: (L x W x D): 8" x 5" x 3" (203mm x 127mm x 76mm)
Shipping weight: 0.8 lbs (365 grams)
Power: 48V phantom power
Conditions: For use in dry locations only between 5C and 40C
Questions & Answers View All
Questions & Answers

© Woodwind & Brasswind. All rights reserved.     Terms & Conditions | Privacy Policy | Accessibility Statement

Bizrate reviews (opens in new window)
You are changing the Ship-To country.

Our product catalog varies by country due to manufacturer restrictions. If you change the Ship-To country, some or all of the items in your cart may not ship to the new destination.