G&W TW-Z5.0A Germanium tube Preamplifier Reference Circuit HIFI Germanium preamplifier

Performance characteristics of TW-Z5.0 germanium tube preamplifier:

Qingyilun TW-Z5.0A germanium tube preamplifier is designed by integrating the essence of the classic circuit of transistors. It is rich in details, unique in charm, full of charm in style, and its micro-dynamics and overtones are unprecedentedly rich. Under the condition of the same free electron concentration and hole concentration, the conductivity of germanium semiconductor material is higher than that of silicon material, and the carrier concentration of germanium is much greater than that of silicon. Therefore, the transient characteristics of the audio amplifier made of germanium tube will be better than that of silicon tube. The germanium tube preamplifier has a unique charm and charm in timbre. The sound of germanium tube is harder than that of bile tube and thicker than that of silicon tube. It has extremely rich overtones, charming timbre, and lively sound. It is a unique timbre that silicon transistors do not have. The feedback resistor of the germanium tube preamplifier is related to the deepening of the sound field. When the feedback resistor is adjusted to the optimal value, the sound field is obviously deepened and can be pulled to the back of the speaker. The Vbe on-voltage of germanium transistors is relatively low, generally around 0.2V. Research has found that germanium far exceeds silicon in terms of channel layer performance such as carrier mobility. The conduction speed of germanium tubes is fast, which is 4 times that of today's silicon transistors. Due to the low Vbe on-threshold voltage, the details are more colorful. The front stage of the germanium tube is graceful and has the delicate and soft tone of a young girl. We will try to see.

1. The classic differential input amplifier circuit is used to reduce distortion and control noise well, and improve the signal ratio

2. Sony's 2SB383 germanium tube is used as the voltage amplifier circuit

3. The output uses two Sony's 2SB383 germanium tubes for push-pull output, and a heat sink is added to each tube to control thermal temperature drift.

4. The German ERO blue 3.3uF100V thin film capacitor is used as the coupling output, and the collector's version uses the Japanese S0SHIN double letter oil-immersed 2uF200V thin film capacitor as the coupling output, and the sound charm is extremely outstanding.
5. Use Japanese ALPS27 blue plastic-sealed high-end motor potentiometer for remote volume control.
6. Use Philips BC axial and other audiophile-grade electrolytic capacitors 25V2200uF6-10 as main filter capacitors, and Swedish RIFA100uF25V electrolytic capacitors as filter capacitors.
7. Use imported 75mm thick copper thin double-sided gold-plated printed circuit boards.
8. Use solid silver aluminum alloy knobs for volume and input selection control.
9. The casing is made of all-aluminum alloy, with 16mm thick black aluminum alloy side panels with grooves stretched by Qing Yilun die, and silver aluminum alloy brushed panels on the front and back. The silver aluminum alloy brushed upper cover CAD is engraved with the Qing Yilun trademark "G&W"
10. Use imported Nippon Steel 0.27mm thick iron core to make audiophile-grade EI-shaped power transformer
11. The input RCA socket uses imported Taiwanese famous brand products.
12. The resistors are Dell and Beijing 718 military resistors.

TW-Z5.0A Germanium tube preamplifier actual technical indicators
1. Input sensitivity: 150mV
2. Frequency response: 5Hz~100KHz (-1dB)
3. Harmonic distortion: 0.005% (1KHz)
4. Signal-to-noise ratio: 100dB (unweighted)
5. Amplification: 6 times (15.5dB)
6. Machine size: width 43*depth 35.5*height 11.5CM
7. Machine weight: 10kg (with packaging)
8. The whole machine comes with an aluminum alloy remote control