Sell Tube amplifier kit diy Wada Shigeru circuit 6Z4*2 ECC83*2 ECC82*2 Fever bile preamp Tube preamplifier best price

Introduction of Wada Shigeru's bile pre-stage circuit: 1: This and the Wada Shigeru kit and finished machine are the products of Changshu fever and old Chen Danyi after more than a year, and began to discuss the modification. In the past year, the circuit has undergone many tests, audition and modification, and finalized, all Using pure manual scaffold welding 2: Those who often play preamps should be familiar with it. There are two well-known advanced preamps: Wada Shigeru and Marantz 7. It is found that in terms of performance and sound quality, Wada Shigeru is still very good. It not only maintains the mellow and musical characteristics of Marantz7, at the same time, it is better than Marantz7 in terms of dynamics, transients, high and low frequency response, and analytical power signal-to-noise ratio, and it is also enough to keep pace with Marantz7 in terms of sound field and transparency. In fact, it is not difficult to find only from the analysis of the Wada Shigeru circuit. Its front stage is composed of a two-stage voltage amplifier composed of a very stable and high-gain double triode. The signal amplification is about 10 times with high sensitivity; the latter stage is also an emitter follower composed of the familiar and very superior double triode 12AU7. The purpose of this stage is not voltage amplification, but It has a very good amplification effect on the current. The pre-stage designed in this way is very reasonable. It has quite high sensitivity and very good carrying capacity. No matter what kind of post-stage it is equipped with, it is more than flexible and can play The incisive and vivid. 3: Those who are familiar with Wada Shigeru's brave pre-levels know that its main feature is outstanding vocals and good midrange. This is suitable for the even harmonic distortion generated when the tube is working. The even harmonic distortion will not reduce the sense of hearing. On the contrary, it will also increase the beauty of the sound. It can make the sound more moisturized, and some details will be more prominent, as if it is right. The details have been optimized to a certain extent, especially when the human voice is played, there will be some strong emotional flavors, and the bold flavor is very strong. It will not only give charm to the human voice, but also play some small pieces of music, such as: some indoor recorded violin, saxophone, jazz and other music, it will also have a unique style Feature of product: Circuit: use Wada Shigeru original improved circuit; Power transformer: 76*40 H250 0.35 pieces Potentiometer: (or Japanese original ALPS 16 type A special audio potentiometer). Bile duct: 12AX7*2/12AU7*2 is the new Dawning high-quality bile duct 6Z4*2 Early Dawning stock bile duct Technical Parameters -Input sensitivity: 400mv -Voltage output: 2V (RMS THD<0.03%) -S/N Ratio: 94DB -Frequency Response: 12Hz-50KHz (-0.5DB) -Input Impedance: 200KΩ -Output Impedance: 600Ω -AC Input: 220V (c