6K4 tube preamplifier tube preamplifier speaker audio home theate

Specifications： This product is a tube pre-amplifierfor and needs to be connected to an active speaker or power amplifierfor. It cannot directly connect speakers and passive speakers, headphones, phono amplifierfor, cars. Product name: tube preamplifierfor Tube: 6K4/6A2（The tube is disassembled） Power supply: DC12-16V, current 1A or more (DC12V 1.5A supply power is recommended)(without supply power) Power socket: DC3.5/5.5*2.1 Product support replace tube: 6J1 6J2 6J3 6J4 6J5 6A2 6K4 6K5 6AK5 6AU6 6BA6 6BD6 EF93 6K7 GE5654 etc. Pre-stage magnification: voltage magnification 5 times Pre-stage frequency response: 5HZ-500KHZ Pre-level sensitivity: 3V Audio input: low-level signal input such as mobile phone, CD, computer, TV, MP3, etc. Audio output: connect to power amplifierfor or active speakers Size: 87*75MM Note: 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. The high-fidelity lift can be adjusted freely, and the three-gear adjustment with a wave switch. The switch on the far left is The switch is in the middle to raise a The switch on the far right is the lift two. Note: 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. 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 amplifierfor. The noise from the audio source is amplified, so please use a good audio source to test. Package included: 1Pcs 6K4 /6A2Tube Preamp（optional）(without supply power)