In 1960s, many amplifiers switched to semiconductor components, and Maijingtu was the only amplifier manufacturer that kept the output transformer. At that time, although many people severely criticized the outdated technology and design of Maijingtu, the company accepted it and explained it one by one, saying that the speaker interface of Ming Dynasty transformer was superior, safer for speakers and amplifiers, more stable in work, and high in sound quality and comprehensive value of goods. The company said it would not give up this business. In addition, aiming at the stiff distortion of semiconductor products, Mai Jingtu developed a "power protection circuit" to solve this problem, and proved that transistors are not worse than vacuum tubes. Gordon is not only a technical worker, but also a well-known figure in international academic circles. He believes that "semantics" is authoritative. He once famously said that audio equipment must arouse users' feelings about music. The power amplifier of Wheat Pure Land is usually equipped with a black glass panel, red, green and blue lights, and its sound is rich, which symbolizes this philosophical saying.
1On June 25th, 989, Gordon died of a heart attack. However, his spirit is still circulating in wheat pure land products. 1949 is the era of vacuum tube (gallbladder machine). Maijingtu successfully launched the first power amplifier 50W- 1, which is a model with high fax degree. In line design, "Maijingtu" adopted a brand-new way. Later, this successful patent application named "Unity Coupled" also had a considerable impact on its future products.
The following year, Maijingtu successfully launched the preamplifier named AE- 1 again. In the following years, "Maijingtu" continuously introduced various split mono, rear vacuum tube power amplifiers and vacuum tube tuners. It was not until 1959 that the first stereo amplifier C20 was successfully introduced, with high-level signal input and singing head input, which was quite the prototype of modern mode. The following year, the first stereo rear-stage MC240 was officially released. The output of each channel reached 40 watts, but the total harmonic distortion was only 0.5%, which was a classic in that year. However, to say the most famous people, we have to count the C22 vacuum tube front stage and the MC275 vacuum tube rear stage released in 1962. These two devices are still sought after by some enthusiasts, and it is not necessary to decide whether their personality orientation is suitable for today's enthusiasts. Each channel uses a pair of KT-88 strong square tubes for push-pull amplification, and each side outputs 75 watts of MC275, at 9
When the 3-year limited edition gold MC275 went on the market, its main circuit and capacity were as faithful as possible to the original version, and a balanced input socket was added to facilitate the different needs of modern users. Later, the C22 commemorative edition was re-launched and was regarded as a contemporary treasure by some modern enthusiasts and audio commentators. As for the first Maijingtu combined vacuum tube amplifier MA230, 1963 came out and declined with the evolution of transistor atomic equipment. The farewell vacuum tube of Maijingtu is a MC3500 back machine introduced by 1968. Since then, "Maijingtu" has officially entered the development era of transistor models. Big blue eyes are the classic symbol of Maijingtu: from vacuum tube to transistor, Maijingtu took four years to adapt to the changes of this era. Of course, there is only one reason-to ensure fax, vividness, stability and reliability. C24, the first stereo preamplifier of Maijingtu, first appeared in 1964. With the development of transistors, a series of transistor post-amplifiers have appeared one after another, which can mark a new generation of Maijingtu power amplifiers. One of its major features is its big "blue eyes", which is used as a blue display screen to indicate the highest output index of each channel. Today, it is still a symbol of quality assurance in this factory. With the development of diversification, Maijingtu not only continued to produce transistor tuners, but also launched a series of speaker products for the first time in 70 years. After more than 20 years' evolution, "Maijingtu" has achieved unique style and achievements in tuner circuits and equalizer systems, and obtained registered patents, while its two most far-reaching registered patents fall on the manufacture of speaker bass unit and the world-famous "power guard". Since 1973, most of the loudspeakers produced by Maijingtu have adopted the registered patent LD/HP magnetic circuit design in the bass unit, which can reduce the distortion rate of the loudspeaker bass unit as high as 10dB. This advanced design makes Maijingtu firmly occupy an important position in the speaker market. Today, some speaker series still adopt this low distortion/high performance LD/HP design.
Maijingtu spent four years researching transistor products, until it was completely satisfied with the transistor amplifier it produced, and the vacuum tube of Maijingtu was officially discontinued. After the appearance of the first transistor C24, the C28 pre-stage, which was once famous in the 1970s, and a series of pre-stages in the 1980s left a glorious page in the history of acoustics. In the early 1990s, the audio control centers of C40 and C36 (that is, the front stage) were the most coveted by enthusiasts, especially the front stage of C40, which adopted a logic-driven electromagnetic conversion selection system. At that time, its advanced design, logic drive system used for the first time, and balanced input/output sockets were all excellent conditions that the best audio equipment could have, and the total harmonic and intermodulation distortion could be effectively controlled at 0. Below 002%, there is a set of five-frequency equalization equipment as high as +/- 12dB and a set of dynamic expansion/compression system registered with Maijingtu patent. Can be found on C40. Other equipment, such as multiple sets of advanced equipment and dynamic head input, double-layer shielded power transformer, independent and separate signal channels, etc., were the main reasons for the widespread popularity of inverted C40. Another special feature is that the C40 itself is called a professional front-end controller, but it also has power equipment, and the power output of each channel is as high as 20 watts, and the "multiple protection circuit" patented by Maijingtu is added. After connecting the rear stage, C40 and the rear stage of the same factory can be used at the same time if the speakers cooperate, so that double broadcasting can be achieved. Use In order to let more ordinary public audio lovers enjoy the achievements of Maijingtu in the history of audio, the factory has also introduced a more popular audio control center C7 12, which has the same basic installation and functions as C38, remote control installation and eight groups of high-level signal input/balanced signal output, but its selection and function buttons are all handled by an electromagnetic conversion processor driven by digital logic, as well as a set of signal processing circuits and two sets of recording and monitoring options. With the continuous improvement of audio equipment quality, "Maijingtu" not only diversified its products, but also spared no effort to upgrade its products. 1997, the latest flagship-C100/PD100 split power supply front stage, can be said that "Maijingtu" has set a new milestone in the Hi-end market. C 100 adopts a large number of high-tech designs, except the electromagnetic conversion selector driven by digital logic. Independent listening and recording equipment, combined with multiple groups of balanced input/output terminals and independent power supply, can not only reduce the interference to the components in the chassis, but also provide powerful and stable pure power supply and fully functional remote control equipment, which sets a new standard for the Hi-end front stage of Maijing Road.
Since 1975, "Maijingtu" applied for a patent for its unique design of "multiple protection circuit", it has been repeatedly used in its power amplifier, and with the blue-eye display screen, it has become the registered trademark of Maijingtu. Maijingtu amplifier is famous for its powerful power output and large current. The most representative transistor amplifier is believed to be MC 1000 mono post-stage, with a powerful power output of 1000 watts per channel, a current as high as 160 amps and a box weight of 47.7 kg per channel. Today it is still a rare behemoth. Even if it is difficult to servo the speakers, they will grovel at the urging of MC 1000.
In order to meet the market demand, "Maijingtu" introduced two high-quality remote control combined amplifiers, MA6800 and MA6400. Generally speaking, the functions and equipment of the two models are the same, but the difference lies in the size of power. In both models, you can find many unique functions and designs of the front and back "Maijingtu". In particular, MA6800 is equipped with other digital logic conversion selectors and self-coupling output transformers, as well as an exclusive patented "multiple protection circuit" system, in addition to the power transformer with double shielding and separate signal direct lines. "Maijingtu" has not only made good achievements in the research and development and manufacture of power amplifiers, but also performed well in the design and manufacture of loudspeakers. Since the first pair of speakers appeared in 1970s and the magnetic circuit design of LD/HP (low distortion/high performance) bass unit was patented, its speaker products have been continuously developed, mainly divided into XR series LS series. The popular LS series, whose design concept is the combination of electroacoustic logic theory and practical listening experience, has been developed by selecting the best materials and advanced driving design technology, plus long-term use in large-scale sound rooms and standard measuring instruments. Generally speaking, LS series speakers mostly adopt two-way or three-way sound insulation network design, and its Linkwitz-Riley design can make the sound insulation rate smooth, smooth and natural during transmission. For high units, LS series mostly adopts aluminum hemispherical tweeters with a diameter of 1 inch, and the basin materials of alto and bass units have been carefully selected, which have high hardness, light weight and excellent internal damping. There is also a registered patent LD/HP magnetic circuit design, which makes the bass refreshing while still maintaining a high degree of fax. The sound cone is made of natural rubber, which not only has long life and durability, but also improves the linear range when moving. LS series has two anti-magnetic speakers LS3 10 and LS330, which will not interfere with TV.
Maijingtu's XR series speakers have a huge lineup, among which the best is a pair of XR290 three-way flagship speaker systems with 40 independent units.
With the change of the times, the power amplifier has changed from vacuum tube to transistor-dominated era, and the development of digital technology has the trend of replacing vinyl records in sound source. 1985, Maijingtu introduced the first combined CD player, MCD7000, until it introduced another multi-disc CD player, MCD7008, which can be used as a "music bank" with a storage capacity of up to seven CDs. Users can arrange the replay sequence of up to 50 tracks by themselves, and can play their favorite music continuously for eight hours at will. The layout process can be performed on the panel of the fuselage. The core of MCD7008 is 20-digit analog-to-digital conversion, which adopts 8 times sampling digital filtering system. The CD clip used by another model of MCD7009 in the same factory is a product that many Hi-end manufacturers are happy to adopt. Its characteristics are high rigidity, no harmonic vibration and more accurate energy picking system. McIntosh level meter displays the power output of lake blue in real time.
The symbol of "Maijing diagram" on the power amplifier reminds people of the blue real-time power output display table "blue eyes" like the instrument on the plane. It can calculate and display high-precision power data in real time, and accurately grasp the maximum bearing power of speakers in dual-channel or single-channel state. Now it has become a symbol of factory quality assurance. But the real value of "pulse diagram" lies in its internal circuit design and many patented technologies. Strict requirements for product manufacturing have become the secret of her success, so that every "Maijingtu" product can achieve near-perfect playback timbre Macintosh Powerguard &; reg
Maijingtu's original protection circuit design continuously monitors the operation state of the circuit during the operation of the amplifier, makes a detailed comparison between the input and output signals, compares the wave pattern difference of the two signals in real time at the speed of every microsecond, and the destructive power of the speaker's back electromotive force feedback, and adjusts the input voltage attenuation with the extremely fast response of 10 ms ... When PowerGuard &; Reg when the indicator light flashes, it tells the user that the sound system is playing back the timbre with the highest efficiency and the lowest distortion, thus ensuring the best protection and the highest durability of the sound system.
Constantly monitor the current, voltage and output state with a variety of highly sensitive components to protect the operation of the whole circuit, avoid the influence of accidental short circuit on the power amplifier and speaker, provide safe output guarantee, never limit the normal power output, and let the equipment play the best timbre within a safe range. McIntosh Output Automatic Transformer & ampreg
The ultra-wideband used in Maijingtu's new generation balanced amplifier circuit should be multi-wire parallel winding output transformer (10Hz~ 100kHz). The factory specially designed its patented output transformer to be used in the amplifier, so that the amplifier elements and load working points in the amplifier are permanently stable, and the transistor is in a more ideal working environment, which greatly improves the service life and safety of the amplifier crystal and protects the speaker from harm. McIntosh thermal protection
If the fuselage is overheated due to long-term work, the temperature monitoring circuit will play a role to keep the fuselage at a suitable temperature and prevent components from being damaged due to overheating. This is the voice of "Mai Jingtu", which can be guaranteed to last for several years. McIntosh electromagnetic switch
In general, when all signals are input into the preamplifier, even if a group of signals are started, other signals are not used, but the current still flows, thus forming current interference and affecting perfect sound performance. However, in the sound world of Maijingtu, the digital logic electromagnetic control switch is installed in the pre-control center or the pre-amplifier circuit of the combined power amplifier. When the DC voltage passes through the sealed glass tube filled with inert gas, it will automatically connect two conductors with excellent communication effect, such as "ruthenium" metal conductor, and let the current pass through the completion loop, thus realizing absolute ultra-quiet arc-free signal source switching, preventing interference and oxidation caused by contact with other signal sources and ensuring no noise. McIntosh Precision Digital Volume Control
The original and extraordinary design of the factory makes the volume adjusted to the highest level of 2 14, and the gain adjustment accuracy of each level is 0.5dB, so that the sound output is more delicate and the volume control is more flexible, effectively improving the signal-to-noise ratio and separation. McIntosh backlight rear glass front panel
Maijingtu's highly transparent reinforced glass panel is unique in the world, because it spent more than 300,000 US dollars to purchase high-pressure hydraulic drilling equipment, all of which were hand-made and went through eight production processes. Extraordinary technology, delicate touch, not easy to oxidize. In addition, screen printing more than 13 times makes the logo of Maijingtu not easy to change color and decolor, and it has been used for many years.