MP200 version: (no tube and no remote control before version)
A preamplifier composed of high-tech design and electronic components. MP200 tone noble enough beautiful, can be said to be a complete charm of the former level. Its high frequency extension, analytical power, the overall speed has been adjusted, referring to the opinions of many enthusiasts, making the analysis of the full frequency become average, frequency, overtone and musical instrument lines are just right, not only in a particular frequency band benchmark, its high-extension process is very clear and full of texture. Its size is dynamic, strong and strong, and has amazing transparency, the "visibility" of the sound field is good, and the compact of the middle and low frequency is also quite in place, this sound effect features a perspective force like X-ray, the sense of darkness before dawn, and the cost performance is very good.
1. Product introduction:
The output of the pre-amplifier and the output of the post-amplifier, a flagship pre-amplifier is very important for the entire audio system. The structure of the circuit Service Manual of the MP200 pre-amplifier belongs to the Diamond Buffer, and the discrete tube-to-tube module is used as a buffer. There is an upgrade we did. There are a total of 6 discrete tube modules, 26 pairs of C2240 A970. If the pins out+ and out- are respectively connected to positive and negative power supplies, it becomes a typical diamond buffer with constant current bias. Of course, if you compare this buffer with the diamond buffer carefully, you can find that the collectors of the two tubes of the first stage are not cross-connected to the power supply in the opposite direction, but are connected to the emitter of the second-stage reflector follower tube in the opposite direction. Above, this is the diamond buffer with bootstrapping. The structure of the module determines the direction of the sound quality, and the direction of the sound: the treble is natural and pure with a slender taste, the bass is full and powerful but feels soft and comfortable, the bass dives very deep; the midrange is relatively full; the sound quality will be found after the machine is burned for three to five days It will make a big difference: the soundstage is wide, the sound is clear, and the control is excellent!
1. Design direction; separate rectification and power supply for voltage levels can make the input differential and amplifier power supplies stable, and the working point will not drift.
2. Design parameters: The input differential circuit is designed to be 1.3MA. The vocal performance is very natural and round (the input differential is generally 1-2MA). The pre-stage voltage is 18V, which is much higher than the general pre-stage (12V) voltage. The advantage is that the sound field can Wide, large dynamic response is good.
3. Design interface: The input is designed as 4 groups of single-ended RCA inputs, the volume is adjusted as a whole, without changing the balance of each frequency band, and an ALPS27 blue-shell stepping potentiometer.
2. Design materials:
1. The board is designed with double-layer circuit boards, and the internal layout is more reasonable, neat and beautiful.
2. High-grade sandblasting paint process aluminum alloy cabinet, the front panel is made of silver 8mm thick aluminum alloy electroplating and drawing process panel, the power indicator light shows the input signal indication, and the high-gloss metal knob (see the picture below).
3. The signal input is switched by 4 groups of stereo, and the rotary switch is used to control the advanced fully sealed relay to realize the signal conversion, which avoids switching noise and has a long service life.
4. Both the input and output interfaces use gold-plated American CMC RCA lotus sockets to reduce contact resistance.
5. The power input line adopts a three-plug socket, which is convenient for replacing and upgrading the power line.
6. Antique oil-immersed capacitors Ina, imported WIMA, mica and other capacitors, Beijing 718 military resistors, and Teflon wire are used.
7. The high-performance R cow with transformer is used for power supply, and the price is high (the square cow has large magnetic leakage, large radiation noise, and low efficiency, while the efficiency of the R cow is as high as 90% and the magnetic leakage is extremely small).
8. Four filter capacitors and adjustable triode control voltage are used to form a filter circuit with good filter effect, which suppresses residual noise.
9. Adopt Japan Toshiba imported 2SC2240 2SA970 with a total of 26 pairs of tubes (52 discrete tubes), the sound is noble and beautiful, warm and durable.
3. Performance parameters:
●Size: 430X70X315MM
●Input impedance: 100K;
●Output impedance: 100 ohms;
●Signal-to-noise ratio: -102dB;
●Frequency response: 10Hz–50KHz;
●Distortion: ≤0.002%;
●The net weight is about 6kg, and the packaged gross weight is about 7kg.
Note: No cables are included.
MP400 Version
Sound description:
- The voice is warm, rich in overtones, and never tired of listening. The voice is sweet and delicate, and the details are excellent. The bass is deep and flexible when diving, and the treble midrange is smooth and soft. It is durable and magnetic.
Product introduction:
1: The vacuum tube is 5670 imported from Singapore, and the sound is warm and transparent. It can also be upgraded to Russian EH6922, with a more detailed sound and a better sense of hierarchy, plus 30 dollars.
2: This machine maintains the characteristics of the courage machine, which is mellow and full of musical flavor. At the same time, it combines the advantages of discrete tubes in terms of characteristic dynamics, transients, high and low frequency response, analytical power, signal to noise ratio, and so on. In terms of sound field and permeability, it can keep pace with the imported first class of tens of thousands of yuan.
3: R-type transformer is adopted, with higher resolution and higher fidelity. German original Mundorf Mcap EVO oil oil immersed coupling frequency division heating capacitor.
4: It is designed with circuit board, and the internal layout is more reasonable, neat and beautiful.
The front panel adopts silver 8mm thick aluminum alloy electroplating wire drawing process panel, blue power indicator tube, and a unique electronic tube display upper cover plate grid, with a higher grade
5: The service life of advanced fully sealed switch controlled by traditional rotary switch is long.
6: Input signal provides two sets of inputs, gold-plated RCA and balanced NEUTRIK high-end XLR input
7: The output signal provides two sets of outputs, gold-plated RCA and balanced NEUTRIK high-end XLR output.
8: The three plug socket is used for the power incoming line, which is convenient for replacing and upgrading the power cord. A power grid filtering and purifying circuit is designed to filter out the clutter and DC components in the power grid.
9: Antique oil immersed capacitor and imported polypropylene capacitor coupling such as WIMA are used. High performance R-type transformer is used for power supply, with high price (ring transformer and square transformer have large magnetic leakage, large radiation noise and low efficiency, while R-type transformer has high efficiency of more than 90% and very small magnetic leakage).
10. The original imported electronic tubes are used, and the original imported discrete tubes are perfectly combined.
11. The pond filter capacitor and the adjustable voltage stabilizing filter constitute an accurate filter circuit with good filtering effect, and suppress the residual noise.
12. The filament of the electron tube is powered by AC, which is warmer and more durable than DC, and will not cause sound hardening, thus prolonging the life of the electron tube. The interference of the filament is reduced.
13: Mature design, outstanding sound quality and stable performance. This machine can be connected to a pure power amplifier, or can be connected to a parallel machine as a voice regulator to further improve the sound quality and enrich the detailed performance.
Parameters:
Size: 430 × three hundred and fifty × 100mm
Input impedance: 100K; Output impedance: 400 Ω;
SNR:-103dB;
Frequency response: 10Hz — 50KHz (plus or minus 1dB);
Distortion: ≤ 0.002%;
Weight: 9kg
Note: No cables are included.
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