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Blackstar Dept 10 Boost in excellent condition. Tube-based boost with an EQ and tons of gain on tap. Requires a power supply that can provide 500 mA (one is included in the box). I used this as a tone enhancer with an HX Stomp, and it helped add some punch and warmth to the models. A sleeper pedal. These sell new for $220, letting this go for $120. More info: The Blackstar Dept. 10 Boost is a high-voltage, tube-driven boost pedal built around a genuine ECC83 (12AX7) preamp valve running at 250V internally — the same operating range as a real tube amplifier — despite accepting a standard 9V DC power supply. Its low-noise, Class A design is touch-responsive and rich in second-order harmonics and natural compression, effectively functioning like adding two extra hot valve stages to your amp. A passive James-Baxandall tone stack with Low and High controls retains the true character of your instrument’s tone, working transparently with virtually any amp or pickup configuration. A built-in buffer and low output impedance also allow it to drive long cable runs and low-impedance pedals without tonal loss, making it equally useful as a signal conditioning tool as it is a pure boost.