300b

SpacEND ZERO Electrostatic Headphone Amplifier

User Manual

Design Introduction

SpacEND 300B The dynamic headphone amplifier adopts a fully balanced electronic tube circuit, and the input adopts the original Swiss LUNDAHL input cow as the first stage buffer and fully balanced phase inversion. The volume adjustment adopts a Japanese ALPS remote control quad high-precision potentiometer; The line voltage amplification adopts four ECC81 and ECC802s, the propulsion stage adopts two ECC802s, and the output adopts four direct heating electron tubes 300B; Eight coupling capacitors are made of American V-cap Teflon fever capacitors and German Mundorf copper foil advanced fever capacitors; The power transformer, choke coil, and output transformer are all made of dual C iron cores from the UK, and are wound with 5N single crystal copper by a professional audio studio; The signal channel and the main working power supply are connected to the internal wires using single crystal silver and imported silver plated oxygen free copper wire.

SpacEND 300B The main power supply design of the dynamic headphone amplifier adopts a 300 watt British dual C iron core single crystal copper wound power transformer structure. The voltage amplification power supply and output power supply are completely independent, and 274B electronic tubes are introduced as high-voltage buffers on the voltage amplification power supply channel. The entire machine uses DC filament power supply. To improve the overall signal-to-noise ratio, a CLC filtering circuit with six chokes has been introduced, along with a front stage circuit voltage stabilizing circuit. The rectifier section uses four American original MR760 diodes, and the high-voltage filtering capacitor uses six Japanese original Nichicon KX fever high-voltage capacitors, ensuring pure, high-speed, and high-energy amplifier power supply.