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The Radial Engineering StageBug SB-15 Tailbone Signal Buffer connects to the beginning of the signal chain and drives multiple pedals without the added noise that often plagues high-impedance circuits.
The signal received from the standard Hi-Z instrument input is corrected using Radial's Dragster load correction circuit to replicate the tone to make it feel as if it is directly connected to the amplifier. The signal is then buffered via a 100% discrete, class-A unity gain amplifier. The discrete design reduces the need for phase-cancelling negative feedback thereby producing a more natural and pleasing tone. Once buffered, the SB-15 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 50' without noise.
The StageBug SB-15 Tailbone Signal Buffer is powered by a standard Boss-style 9V power supply (not included). 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 15 VDC and provide the correct voltage polarity. The SB-15 delivers high-quality sound, reduces noise, and simplifies adding a high-end Tonebone to your pedalboard.
Hi-Z 1/4" guitar input connects to a class-A buffer circuit
9 VDC In-1 provides power to the Tailbone class-A active buffer circuit
9 VDC In-2 is used with 9 VDC In-1 to increase input power so that the Tailbone can deliver 15V to a Tonebone pedal
Enclosure is made from 14-gauge steel to protect sensitive internal electronics while shielding against magnetic fields
1/4" buffer output connects to pedals and amp, allowing longer cable run without noise (up to 50')
15 VDC, 400mA output designed to supply Tonebone pedals using two 9 VDC supplies as the power source
Durable powder-coat finish
Double-sided, military-grade circuit board features through-hole solder points for extra durability, and full-surface ground plane to reduce susceptibility to noise
Stand-offs are made from steel and pressed into the outer casing to ensure proper retention of the circuit board
Connectors made from glass-filled nylon are insulated for reduced noise and feature nickel-silver contacts that will not tarnish
Dual potentiometer doubles up solder points for greater durability, and steel casing with steel shaft and retention nut does not bend when under stress
Drag Control load correction adjusts the load on the pickup for a more natural sound and feel
In the Box
Radial Engineering StageBug SB-15 Tailbone Signal Buffer
Limited 3-Year Warranty
Table of Contents
Audio Circuit Type
Class-A FET buffer
20 Hz to 30 kHz
Total Harmonic Distortion
0.01% @ 1 kHz
104 dB with dual 9 V supply
98 dB with single 9 V supply
22 to 500 kOhms
0 dB (unity gain)
Output: 16 dBu
<5° at 20 Hz
1/4" unbalanced Hi-Z in / out
Drag control load correction circuit
Dual 9 VDC, 200 mA for optimal performance
May be used with single 9 VDC supply to power buffer only
Power Input Connector
Standard 2.1 mm barrel with center negative (-)
Power Output Connector
Standard 2.1 mm barrel with center positive (+)
15 VDC, 400 mA
For use in dry locations only between 41 to 104°F (5 to 40°C)