Photo 1 of ?Douk Audio Vacuum Tube Preamp: Headphone Amp with VU Meter, 4-Way RCA Selector Switch Box, Preamplifier with Tone Control for? Receivers, Amplifiers, Speakers, 16-600? Headphones (TUBE-T5C)

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Photo 1 of ?Douk Audio Vacuum Tube Preamp: Headphone Amp with VU Meter, 4-Way RCA Selector Switch Box, Preamplifier with Tone Control for? Receivers, Amplifiers, Speakers, 16-600? Headphones (TUBE-T5C)Photo 2 of ?Douk Audio Vacuum Tube Preamp: Headphone Amp with VU Meter, 4-Way RCA Selector Switch Box, Preamplifier with Tone Control for? Receivers, Amplifiers, Speakers, 16-600? Headphones (TUBE-T5C)Photo 3 of ?Douk Audio Vacuum Tube Preamp: Headphone Amp with VU Meter, 4-Way RCA Selector Switch Box, Preamplifier with Tone Control for? Receivers, Amplifiers, Speakers, 16-600? Headphones (TUBE-T5C)