Photo 1 of ***ITEM TESTED FOR POWER, UNABLE TO TEST FURTHER*** Douk Audio U10 Mini Vacuum Tube Headphone Amp Amplifier 3.5mm 6.35mm for PC - High Fidelity Stereo Preamp for Home Speakers & Hi-Res Audiophiles

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Photo 1 of ***ITEM TESTED FOR POWER, UNABLE TO TEST FURTHER*** Douk Audio U10 Mini Vacuum Tube Headphone Amp Amplifier 3.5mm 6.35mm for PC - High Fidelity Stereo Preamp for Home Speakers & Hi-Res AudiophilesPhoto 2 of ***ITEM TESTED FOR POWER, UNABLE TO TEST FURTHER*** Douk Audio U10 Mini Vacuum Tube Headphone Amp Amplifier 3.5mm 6.35mm for PC - High Fidelity Stereo Preamp for Home Speakers & Hi-Res AudiophilesPhoto 3 of ***ITEM TESTED FOR POWER, UNABLE TO TEST FURTHER*** Douk Audio U10 Mini Vacuum Tube Headphone Amp Amplifier 3.5mm 6.35mm for PC - High Fidelity Stereo Preamp for Home Speakers & Hi-Res Audiophiles