Boya Gallbladder Pre stage MP500 6922 Gallbladder HiFi High fidelity Pre stage Amplifier High end Professional Pre stage

EH6922 Russian electronic tube: beautiful sound, smooth high frequency, full mid low frequency, and extremely strong infectivity. Sweet mid frequency, round yet detailed sound, well positioned sound field, very clear hierarchy, strong analytical power, and excellent musical sense!

1、 Product Introduction:
1. Designed with circuit boards, the internal layout is more reasonable, tidy and beautiful.
The front panel adopts silver 8mm thick aluminum alloy electroplating and drawing process panel, blue power indicator tube, and adds a unique electronic tube display top plate grid, with a higher grade (see the figure below).
2. Advanced sandblasting paint process, pure aluminum alloy 3mm thick box, high gloss metal knob, pure aluminum alloy large machine foot.
3. Using traditional rotary toggle switches to control advanced fully sealed switches has a long lifespan.
4. The input signal provides four sets of inputs, three sets of gold-plated RCA and balanced NEUTIK high-end XLR inputs
5. The output signal provides two sets of outputs, gold-plated RCA and balanced NEUTIK high-end XLR output.
6. The power inlet adopts a three plug socket, which is convenient for replacing and upgrading the power cord.
7. Design a power grid filtering and purification circuit that can filter out clutter interference and DC components in the power grid.
8. We use antique oil immersed capacitors and imported WIMA polypropylene capacitors for coupling.
9. The power supply adopts multiple high-performance, high-efficiency, leakage free, radiation free, and noise free high-end transformers.
10. Adopting original imported electronic tubes (paired), perfectly combined with original imported high-precision operational amplifiers (paired).
11. The pond filter capacitor combined with adjustable voltage stabilizing filter forms a precise filtering circuit with good filtering effect, which suppresses residual noise.
12. The filament of the electronic tube is powered by AC power, which is warmer and more durable than DC power, and will not cause sound hardening. At the same time, it extends the life of the electronic tube and reduces interference from the filament; Four sealed transformers achieve digital analog separation, power supply and signal power supply separation, and do not interfere with each other, resulting in a dark, clean and interference free background.


2、 Performance parameters:

 Size: 430 × 380 × 105mm
Input impedance: 470K; Output impedance: 470 ohms;
Signal to noise ratio: 110dB;
Frequency response: 5Hz-50KHz (plus or minus 1dB);
Distortion: ≤ 0.001%;
Weighing approximately 11kg