Features: It is only a preamplifier, not an amplifier, and cannot be connected directly to a passive speaker. If you need to connect it to a passive speaker, you need to connect it to an amplifier, and then connect the amplifier to your passive speaker. Low noise integrated circuits and high-quality components convert phonograph signals to line level signals to eliminate low frequency noise and ensure clear sound quality. Protect your turntable with a grounded column design. Tubular preamplifier: It is also a tubular preamplifier with a 3.5mm input. High quality components. Very smooth sound. Apply vacuum tube type: 6K4/6J1/6J1P/6J2/6J3/6J4/6J5/6AK5/6K4/6ZH1P/4.3a/EF95, etc. In vacuum tubes, etc., you can replace vacuum tubes to DIY your system. Different tubes have different sounds. Specifications: Material: Aluminum Alloy Power adapter output: 12V/1.5A Product adapter input voltage range: AC100V-240V Output voltage level: 650Mv@3mV 1kHz SNR: 70dB THD: 0.1% Frequency response: Standard RIAA Type: 1/2/3/4 Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Preamplifier 2x Vacuum Tube 1x DC12V Power Adapter 1x Manual 1x Cable