Parameters:
▶ Audio Input: 2 groups of RCA/Bluetooth 5.0/U-disk/AUX/FM Radio/SD Card
▶ Audio Output: Stereo L/R RCA
▶ Input Power: AC 220V and 110V(users can switch freely)
▶ Bluetooth: Qualcomm 5.0
▶ Tubes: 2*6H3N
▶ Power Consumption: 20W
▶ Input Sensitivity: 25mV
▶ Maximum undistorted output level: 13.5V
▶ Whole machine magnification: 5 times
▶ SNR: ≥90dB
▶ Size: 251*172*142mm
▶ Color: Silver,Black
Functions:
▶ Bluetooth function (Bluetooth 5.0 version),can realize Bluetooth music playback,Bluetooth hands-free call.
▶ Audio decoding,the formats that can be decoded include MP3 and lossless music format APE/WAV/WMA/FLAC(support U disk and SD card),etc.
▶ Front panel AUX input function
▶ FM radio function
▶ Clock function
▶ The function switch has voice prompts,and the caller&x27;s number will be announced by voice when the phone calls
Design Inspiration:
▶ A few years ago,I was invited by friends in the circle to make an improved version of the Matisse line bladder preamplifier.In the early stage,only PCBA was made.The vacuum tube can directly use domestic 6N3,E5670 produced in Europe and America,6H3N produced in the former Soviet Union,Western Electric 396A or 2C51 (no need to change the line,directly substitute).After listening to everyone,the low-frequency dive is better,the sound is soft and mellow,and it has a richer vacuum tube unique charm...
▶ When drawing the PCB,special attention was paid to grounding and anti-interference,so that the amplifier circuits of all levels were gathered step by step,and then a single point landed,and a large area of copper was laid. Finally,the effect is gratifying: the input terminal is connected to the ground in parallel with a 10K resistor, and the volume is adjusted to the maximum. When the rear stage is connected to a 100W power amplifier,the low-frequency hum and annoying background noise can hardly be heard when approaching the speaker.In terms of components,the main power supply filter uses ruby electrolytic capacitors,and the channel cross-connect capacitors use audio-specific CBB capacitors,which make it sound The volume potentiometer is set at the output stage,which also contributes a lot to improving the signal-to-noise ratio of the whole machine...
▶ When doing the industrial design of the cabinet,CAD drawing,laser cutting,CNC bending and laser lettering are used in order to be as refined and accurate as possible and to reduce the difficulty of assembly.The case is made of a nominal 1mm anti-fingerprint mirror material,and the side board is made of imported mahogany Sapele solid wood board.In short,everything is only to look as high-end as possible.
▶ Our requirements for the Bluetooth module are very clear: the sound quality must reach the Hi-Fi level,there is no noise at the bottom (our preamplifier&x27;s efforts in suppressing the noise at the bottom can&x27;t make the Bluetooth components abolish the martial arts),switch the machine,There should be no popping sound when changing music,there is a memory of volume status after shutting down.After several improvements,it has now been upgraded to Bluetooth 5.0 version.
▶ The whole machine uses fever components: the power supply channel resistance uses high-precision metal film resistance,the tube operating point setting resistance uses VISHAY wafer resistors,the bile rectification,filter capacitors use ruby capacitors,and the channel cross-connect capacitors use audio-specific CBB polypropylene capacitors.The input and output RCA sockets use pure copper plated real gold sockets...
Package:
▶ 1 * Tube Preamp
▶ 1 * AC Power Cable
▶ 1 * Bluetooth Antenna
▶ 1 * RCA Cable
▶ 1 * AUX Cable
▶ 1 * AUX to RCA Cable
▶ 1 * FM Antenna
▶ 1 * Remote Control