ZERO前级放大器

设计简述

SpacEND ZERO前级放大器采用变压器输入与变压器输出无反馈全电子管单端放大线路，PCB线路板采用了全新的处理工艺，确保信号传输的可靠性，输入端子采用两组NEUTRIK NC3FAAV1平衡插座与两组RCA插座共计四组输入，输出分别有平衡XLR（NEUTRIK NC3MAH）与单端RCA（FURUTECH FT909 镀金版）各一组，信号输入级采用瑞士原装LUNDAHL输入牛为第一级缓冲，音量调节采用丹麦原装DACT 23级步进电位器，电位器采用精密、无感抗、低噪音金属氧化薄膜SMD晶片电阻，寿命高达25,000次以上，线路电压放大采用两颗英国原装BRIMAR 12AU7，推动级采用一颗英国原装BRIMAR 12AU7直耦一颗英国原装BRIMAR 12AU7输出推动瑞士原装LUNDAHL输出牛输出XLR与RCA（注：不能同时使用），两颗耦合电容采用日本原装Amtrans AMCY 0.1uF黑金系列高级油浸电容，所有音频通道电阻都采用日本原装Amtrans，信号通道与主工作电源部分机内线，采用单晶银与单晶铜线材连接

机箱采用全铝设计，脚钉采用了SpacEND 3D避震钉，所有变压器均采用环氧树脂灌注密封处理，确保整机的震动控制在最小范围

SpacEND ZERO前级放大器主电源设计，采用日本冷轧Z11E型矽钢片与优质国标无氧铜漆包线绕制成50瓦电源变压器作结构，电压放大供电与输出供电完全独立，并在整机供电通道上引入英国原装6X4电子管作为高压缓冲，整机采用直流灯丝供电。为提高整机信噪比而引入了扼流圈的CLC滤波线路，外加全线路稳压电路，整流部分采用四颗美国原装MR760二极管，高压滤波电容采用二颗日本原装NICHICON KX系列音频发烧高压电容与五颗KX系列退耦音频发烧高压电容，确保纯净、高速、充沛能量的放大器供电

Design Introduction

SpacEND ZERO preamplifier adopts transformer input and transformer output single ended amplification circuit without feedback. The PCB circuit board uses a new processing technology to ensure the reliability of signal transmission. The input terminal consists of two sets of NEUTRIK NC3FAAV1 balanced sockets and two sets of RCA sockets, a total of four sets of inputs, and the outputs are balanced XLR (NEUTRIK NC3MAH) and single ended RCA (FURUTECH FT909 Gold Plated version), the signal input stage adopts Swiss original Lundahl input transformer as the first buffer stage, the volume adjustment adopts Danish original DACT 23-step potentiometer, the potentiometer uses precision, non inductive, low noise metal oxide film SMD chip resistor, the service life is up to more than 25,000 times, and the line voltage amplification adopts two British original Brimar for the driving stage, a British original Brimar 12au7 is used for direct coupling, another British original Brimar 12au7 is used for output with Swiss original Lundahl transformer as outputs XLR and RCA (Note: they cannot be used at the same time). The two coupling capacitors are Japanese original Amtrans AMCY 0.1uF black gold series high-grade oil capacitor, all audio channel resistors are made of original Amtrans from Japan, and the signal channel is connected with the main working power supply part of the internal wire, which is made of single crystal silver and single crystal copper wire

The chassis adopts all aluminum design, the foot pin adopts SpacEND 3D absorption feet, and all transformers are sealed with epoxy resin, so as to ensure the vibration of the whole machine is controlled within minimum range

The main power supply of the front stage amplifier is designed with a 50 Watt power transformer made of Japanese cold rolled z11 E-type silicon steel sheet and high-quality national standard oxygen free copper enameled wire. The voltage amplification power supply and output power supply are completely independent. The British original 6x4 electron tube is introduced into the power supply channel of the whole machine as a high-voltage buffer, and the whole machine is powered by DC filament. In order to improve the signal-to-noise of the whole machine, the CLC filter circuit with choke coil is introduced, and the whole line voltage stabilizing circuit is added. The rectifier part adopts four original mr760 diodes from the United States, and the high-voltage filter capacitor adopts two original Nichicon KX series audio frequency high-voltage capacitors from Japan and five decoupling KX series audio frequency high-voltage capacitors to ensure the power supply of pure, high-speed and abundant energy amplifier

技术参数

电子管型号： 12AU7*4、6X4*1

整机失真：> 0.05% 

测试条件THD+N，输入：1V rms，RZ：600 ohm，BW：DC-20KHz，A记权

放大增益：600：10dB；HIGH：20dB

输出阻抗：150/600欧

信号输入：XLR 平衡输入*2与RCA单端输入*2各兩组

信号输出：XLR 平衡输入与RCA单端输入各一组

输入电压：AC 110-220V可切换

通过电源主机的输入电压开关调整输入电压。注意！开机前请确认当前本地工作电压，调整前級放大器交流电源输入电压与本地电压一致后开机使用

电源保险丝：AC 220V（1 A）；AC 110V（1.25A）

整机消耗功率：40W

主机净重：10KG

主机机箱尺寸：430mmx360mmx88mm

Technical Specifications

Type of Electronic Tube：12AU7*4、6X4*1

THD+N：> 0.05% 

Testing Conditions：THD+N，input：1V rms；RZ：600 ohm；BW：DC-20KHz A-weighted

Amplifier gain：600：10dB ；HIGH：20dB

Impedance adjustment：150 / 600 ohm

Signal input：Two groups of XLR balanced input * 2 and RCA single ended input * 2 

Signal output：One set of XLR balanced input and one set of RCA single ended input 

Signal Input： XLR Balanced Input *1 and RCA Single-ended Input *1

Input Voltage：AC 110-220V

The input voltage is adjusted by the input voltage switch on the back of power supply. Attention! Confirm the current local power voltage first and adjust the input voltage switch to the right voltage before turning on

Power Fuse：AC 220V（1A）；AC 110V（1.25A）

Power Consumption：40W

Net weight of main engine：10KG

Main Unit Size：430mmx360mmx88mm

前后面板（Front & Rear Panel）

图一

图二

保修条款

整机保修一年，电子管因外力造成损坏不在保修范围内，机器停产后负责维修五年

附件清单

1、前级放大器主机一台

2、美标国标电源线一条

3、12Au7电子管四颗、6X4电子管一颗

4、备用保险丝一枚

5、使用说明书一本

警告

前级放大器电源未完全接通前，严禁开启工作电源（AC220/100伏）

Warranty

The whole set is guaranteed for one year. Any tube damage caused by external force is not covered by the warranty. It is responsible for the maintenance for five years after the model is discontinued

Accessories

1.One front amplifier host 

2.12AU7s tube *4、6X4 tube *1

3.Spare fuse *1

4.User manual *1

Warnings

It is forbidden to turn on the working power supply (AC220 / 100V) before the power supply of the front amplifier is fully connected 

         SpacEND 音响工作室

Made in Shanghai

www.yeaudio.com