Горячий образец продаж Accuphase MP200 C2820, симметричное зеркало

reference Accuphase MP200 C2820 mirror symmetrical differential circuit design Preamplifier HIFI

The

MP200 electronic circuit refers to the Accup hase MP200 pre-amplifier

circuit, which is a pre-amplifier composed of high-tech design and

high-quality electronic components. The MP200 sound is noble and

beautiful, and it can be said to be a charming pre-amplifier. Its

high-frequency extension, analytical power, and overall speed have been

adjusted, referring to the opinions of many music lovers, making the

analysis of the whole frequency average, and the frequency, overtones

and instrument lines are just right, not just a special benchmark in a

certain frequency band, Its high extension process is very clear and

full of texture. It is dynamic in size, strong and weak, and has amazing

transparency. The "visibility" of the sound field is good, and the

compactness of the mid and low frequencies is also in place. This sound

feature has the perspective of X-ray and the sense of darkness before

dawn. , A preamplifier with a good price/performance ratio.

The

power of the pre-amplifier is the output of the power amplifier. A

flagship pre-amplifier to match the post-amplifier is essential for the

entire audio system. The structure of the MP200 pre-amp circuit Service

Manual belongs to Diamond Buffer, discrete tube to tube We have upgraded

the module as a cache. There are 6 discrete transistor modules, 26

pairs of C2240 A970. If the out and out- pins are connected to the

positive and negative power supply respectively, it becomes a typical

diamond buffer with constant current bias. Of course, if this buffer is

carefully compared with the diamond buffer, 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 of the emitter follower tube in the opposite

direction. Above, this is the diamond buffer with bootstrap. The

structure of the module determines the direction of the sound quality,

and the direction of the sound: the treble is naturally innocent and has

a slender taste, the bass is full and powerful but feels soft and

comfortable, the bass dive is very deep; the midrange is relatively

full; the sound quality will be found after the machine has been burned

for three or five days There will be a big difference: the sound field

is wide, the sound is clear, and the control is very good!

1.

Design direction; separate rectified power supply of voltage stage can

make the power supply such as input differential and amplifier stage

stable, and the working point will not drift. This benefit reflects that

the sound is very delicate and the sound quality is clear.

2.

Design parameters: The input differential circuit is designed to 1.3MA

and the human voice performance is very natural and round (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

the sound field performance. Wide, great 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, and the balance of each

frequency band is not changed, and an ALPS27 blue-shell stepping touch

potentiometer.

4.

Signal input 4 groups of stereo switch, use the rotary switch to

control the advanced fully sealed relay to realize the signal

conversion, avoid the switching noise, and have a long life.

5. The input and output interfaces are all gold-plated American CMC RCA lotus seats to reduce contact resistance.

6. The power inlet adopts a three-plug socket, which is easy to replace and upgrade the power cord.

7.

It uses antique oil-immersed capacitor Ina and imported WIMA Weimar,

mica and other capacitors, Beijing 718 military resistance, Teflon wire.

8.

Adopting high-performance transformer power supply, high price (square

cattle magnetic leakage, large radiation noise, low efficiency, while

the efficiency of R cattle is as high as 90% or more, and the magnetic

drain is small).

9.

Four filter capacitors and adjustable triode control voltage are used

to form a filter circuit with good filtering effect and suppress

residual noise.

10.

It adopts 2SC2240 2SA970 imported from Japan's Toshiba, a total of 26

pairs of tubes (52 discrete tubes), the sound is noble and beautiful,

and it is 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%;

●Weight: 7KG

Brand Name : GZbotolave

Certification : CE

Origin : Mainland China

Maximum Power Per Channel : NO POWER

Model Number : C2820

Package : Yes

Channels : 2 (2.0)