G&W TW-F5.0A HIFI tube Preamplifier Refer to Famous Preamplifier Circuit

G&W TW-F5.0 Class A field tube preamplifier performance features:
1. Classic differential input amplifier circuit, JFET field tube input impedance is high.
2. Classic dual differential amplifier amplification circuit, Sweden's Gowen and FM also use this circuit, Qing Yilun has improved it.
3. The output uses MOSEFT tube IRF610 quasi-complementary output, and the American PASS PASS preamplifier also uses this field effect tube
4. Use Japanese ALPS blue 27 type plastic sealed motor high-end potentiometer.
5. Use Panasonic, Philips and other audiophile capacitors, Beijing 718 factory metal film resistors. ☆
6. Use imported 70um thick copper thin double-sided gold-plated printed circuit board.
7. Use aluminum alloy brushed panel and aluminum alloy case, aluminum alloy silver knob, with blue LED digital display remote control volume, luxurious and high-end.
8. Imported E1 iron core power transformer
9. Imported Taiwan brand-name products are used for input RCA socket:
10. Oxygen-free copper signal line is used for output signal line

Measured technical indicators of TW-F5.0A machine
Input sensitivity: 150mV
Frequency response: 2Hz~100KHz (-1dB)
Harmonic distortion: 0.005% (1KHz)
Signal-to-noise ratio: 100dB (unweighted)
Amplification gain: 15.5dB5
Machine weight: 10kg (with packaging)