Skillfully use 6J1 to keep good liner and working status when plate voltage is as low as 50V, adopt AC 12V low voltage power supply, through voltage boost to +/- 28V, outstanding extend tube's lifespan and improve SNR.
Positive and negative DC power supply, can fully use transistor element, component easy to fide, low cost, no need to use high price, large volume element.
Designed board volume controlled potentiometer, power switch, power input interface, audio input and output interface, convenient to use, digital tube bottom with orange LED
Support CD/VCD/DVD/MP3X-10D designed, more stable than original; AC 12V input, through circuit processing, provide 6J1 digital tube positive and negtive voltage and filament
Working principle: Turn on power, filament of digital tube start heating, voltage boost from 0 until filament hot, the same with bile rectifier, clear 8 PCS 470UF capacitor filtering, standard connection method: CD~front level P5-1~ your amplifier~speaker.