Amazon.com: Linsoul XDUOO MT-601S Tube+Class-A Headphone Amplifier Preamplifier 12AU7/ECC82 Tube Transistor, 4 AUX Ports Line Out, Matte Aluminum Alloy Shell, Knob Volume Adjustment for Musician Audiophile : Electronics
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Amazon.com: Linsoul XDUOO MT-601S Tube+Class-A Headphone Amplifier Preamplifier 12AU7/ECC82 Tube Transistor, 4 AUX Ports Line Out, Matte Aluminum Alloy Shell, Knob Volume Adjustment for Musician Audiophile : Electronics
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![Review] A tale of three lowcost single tube headphone amps/preamps](https://www.tnt-audio.com/jpg/competitors.jpg "Review] A tale of three lowcost single tube headphone amps/preamps")