A3 PRO 6K4 Tube Preamplifier Amplifier Preamp HiFi Tube Preamp Bile Buffer Amp Speaker Sound Amplifiers ,Low Profile Design

<p>Product parameters:</p><p>Product name: A3 PRO</p><p>Tube model: 6K4</p><p>The tube that can be replaced are: 6J1, 6J2, GE5654, 6J3, 6J4, 6J5, 6J1, 6AK5, etc.</p><p>OP AMP chip: NE5532P*2</p><p>Replaceable OP amp chips: OPA2604, OPA2134, LM4562, JRC5532, etc.</p><p>chip: domestic JL (AC20BP04230-25C4), 5.0</p><p>Distortion: 3%</p><p>Frequency response range: 20hz-20khz (±3db)</p><p>Signal-to-noise ratio: 98db</p><p>Tweeter adjustment range: ±6db</p><p>Bass adjustment range: ±10db</p><p>Input mode: RCA</p><p>Supported devices: mobile phones, tablets, computers, MP3, TVs, etc., The pre-stage of this game does not support singing and playback.</p><p>Output mode: active speaker or power amplifier + passive speaker</p><p>Working power supply: DC12V</p><p>Size: 118*95*30mm</p><p></p><p>Note:</p><p>Please select the color and power you need, select unit is Not Power Supply included.</p><p>This product is a tube pre-amplifier and needs to be connected to an active speaker or power amplifier.</p><p>It cannot directly connect speakers and passive speakers, headphones, phono amplifiers, cars.</p><p>Related Products: </p><p>amplifier, </p><p>mini amp, </p><p>stereo amplifier, </p><p>mini amplifier, </p><p>speaker amp, </p><p>subwoofer amplifier, </p><p>amps for subwoofers, </p><p>monoblock amplifier, </p><p>class d amplifier, </p><p>car stereo amplifier</p>

• 1. The product is a preamplifier, not a power amplifier. It should be used with a post-amplifier or an active speaker. It is not allowed to directly connect passive speakers, speakers and earphones to the power amplifier; if it is not used, the car will be burnt if the voltage is unstable.
• 2. The general line or power supply filtering is not good, the probability of the bottom noise current is very large, it is recommended to use a good cable or power supply.
• 3. Make sure that there is no problem with your own source. The preamplifier has its own preamplifier function. If the source itself has noise, then the preamplifier will only amplify its noise. Please use a good sound source test.
• 4. Check if the tube is plugged into the base. Please insert the tube and the base. Be sure to insert the tube in case of power failure.