<div class="detailmodule_html"><div class="detail-desc-decorate-richtext"><div><span style="font-size:18px"><strong>Product description:</strong></span></div><div> </div><div><span style="font-size:16px">--This product is a tube pre-amplifier and needs to be connected to an active speaker or power amplifier.</span></div><div> </div><div><span style="font-size:16px">--It cannot directly connect speakers and passive speakers, headphones, phono amplifiers, cars.</span></div><div> </div><div> </div><div><span style="font-size:16px">Product name: tube preamplifier</span></div><div> </div><div><span style="font-size:16px">Tube: </span><span style="color:rgb(0, 98, 177);font-size:16px">6K4</span><span style="font-size:16px">/</span><span style="color:rgb(159, 5, 0);font-size:16px">6A2</span></div><div> </div><div><span style="font-size:16px">Power supply: DC12-16V, current 1A or more (DC12V 1.5A supply power is recommended)(without supply power)</span></div><div> </div><div><span style="font-size:16px">Power socket: DC3.5/5.5*2.1</span></div><div> </div><div><span style="font-size:16px">Product support replace tube: 6J1 6J2 6J3 6J4 6J5 6A2 6K4 6K5 6AK5 6AU6 6BA6 6BD6 EF93 6K7 GE5654 etc.</span></div><div> </div><div><span style="font-size:16px">Pre-stage magnification: voltage magnification 5 times</span></div><div> </div><div><span style="font-size:16px">Pre-stage frequency response: 5HZ-500KHZ</span></div><div> </div><div><span style="font-size:16px">Pre-level sensitivity: 3V</span></div><div> </div><div><span style="font-size:16px">Audio input: low-level signal input such as mobile phone, CD, computer, TV, MP3, etc.</span></div><div> </div><div><span style="font-size:16px">Audio output: connect to power amplifier or active speakers</span></div><div> </div><div><span style="font-size:16px">Size: 87*75MM</span></div><div> </div><div> </div><div><span style="font-size:18px"><strong>Note:</strong></span></div><div> </div><div><span style="font-size:16px">1.The tube preamp is a class A amplification state.. It is recommended to use shielded wire for the signal wire. Common wires may cause leakage or noise.</span></div><div> </div><div><span style="font-size:16px">2.The high-fidelity lift can be adjusted freely, and the three-gear adjustment with a wave switch.</span></div><div><span style="font-size:16px">The switch on the far left is Hi-Fi</span></div><div><span style="font-size:16px">The switch is in the middle to raise a</span></div><div><span style="font-size:16px">The switch on the far right is the lift two.</span></div><div> </div><div> </div><div><span style="font-size:18px"><strong>Note:</strong></span></div><div> </div><div><span style="font-size:16px">1. If the signal line is not shielded or the power supply is not well filtered, noise may be generated. It is recommended to use shielded wires and a clean power supply for testing.</span></div><div> </div><div><span style="font-size:16px">2. The tube buffer is amplified by about 5 times. The pre-amp has an amplification function, which is connected between the audio source, the pre-amp and the power amplifier. The noise from the audio source is amplified, so please use a good audio source to test.</span></div><div> </div><div> </div><div><span style="font-size:18px"><strong>Package included:</strong></span></div><div> </div><div><div><span style="font-size:16px">1* 6K4 /6A2Tube Preampoptional</span><span style="font-size:16px"><span style="color:rgb(255, 0, 0)">(without supply power)</span></span><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/></div><div><span style="font-size:18px"><strong>New upgrade: DC boost version:</strong></span><br/><br/><span style="font-size:16px">Working principle of power supply:</span><br/></div><div><span style="font-size:16px">As soon as the machine is turned on, the electronic tube filament begins to heat up, and at this point, the voltage rises from zero. Once the electronic tube filament heats up, the voltage just rises.</span><br/></div><div><span style="font-size:16px">Filament principle:</span><br/></div><div><span style="font-size:16px">An excellent power supply system will prevent current noise. The filament is powered by DC 12V, and the filaments of the two tubes are connected in series. The use of DC filament power supply is also to reduce noise.</span><br/></div><div> </div></div></div></div><p><br/></p>