The good sound you can hear, the quality and craftsmanship you can see!
In view of some shortcomings of the traditional Marantz 7 circuit, the Japanese Hotan Mao's improved on the basis of the Marantz 7 circuit. The improved circuit is called the Hotan Mao's circuit. Its main feature is to replace the cathode follower of the Marantz 7 circuit with the SRPP circuit. Since the SRPP output stage does not have any voltage amplification effect, it is only used as a buffer stage. Compared with ordinary cathode output devices, its driving load capacity is stronger. In terms of timbre, it maintains the characteristics of the intermediate frequency sweetness of the Marantz 7 line, and its analytical power is compared with the high frequency and low frequency response. Marantz 7 is better, the signal-to-noise ratio is relatively high, and all the tubes used in this circuit can also be switched to 12AT7.
Some time ago, according to the special requirements of a guest, I was asked to customize a high-voltage anode for power supply. The high-voltage oil-immersed capacitor is used for filtering. The input and output coupling capacitors also use oil-immersed capacitors. After the result is made, the sound gets another different surprise. The human voice is poisonous, the high frequency is delicate, and the low-frequency diving depth is sufficient, and the sound balance is very good!Describe it in one word, positive!!!
one.The high-voltage part of the power supply adopts 6×4 (EZ90) famous tube as the tube rectifier + Japanese Kubota-style high-voltage voltage regulator circuit. The 6×4 (EZ90) rectifier tube is slightly better than the domestic 6z4 and the Russian 6u4n in speed, detail, and analytical power!Japan's Kubota-type high-voltage voltage regulator circuit adopts Hitachi field effect tube 2SK1170. As we all know, the field effect tube has the advantages of low output internal resistance, small ripple coefficient, and sweet sound. This is the difference between this circuit and other products, and it is also a highlight of this machine. At the same time, this circuit has a high voltage delay, anti-boot impact, and can protect the life of the amplifier part of the tube.After the voltage is stabilized, it will be even more exciting. After the voltage is stabilized, a three-stage RC high-voltage (German-made large oil-immersed and American Longbiao GE Mexican origin) oil-immersed capacitor is used for filtering to make the voltage purer. The high-voltage oil-immersed capacitor creates a super poisonous vocal, delicate high frequency, pure thick and powerful low frequency, making the sound performance very comprehensive and balanced!
two.The amplification part adopts the independent separation of the left and right channels, and the ground wire is reasonably grounded. Many people are worried about the noise with Hotan Mao's. Indeed, this is also difficult to overcome, but don't worry about the noise of this machine. It has been debugged to a very good level. Keep your ears close to the speaker and listen to only a little bit of weak tube thermal noise. I believe that every burning friend who plays with the tube can fully accept it. If this is unacceptable, then you don't need to play with the tube.All imported capacitors are used in this machine. The filter capacitors are Nikon, Philips BC, Visteon, etc., and the input and output coupling capacitors are expensive Mcap (Montauk) oil-immersed capacitors imported from Germany. The oil-immersed capacitors create a poisonous human voice. The delicate high frequency and the pure thick and powerful low frequency make the sound performance very comprehensive and balanced. Characteristics.
three.The power transformer adopts the expensive and rare R-type transformer in the audio industry at any cost. It can only be seen in high-end audio. The chassis is an all-aluminum high-end chassis, a large solid all-aluminum knob, a pure copper input and output RCA seat, a genuine Japanese alps27 volume potentiometer,, Japan imported Kanaimei signal line, etc., The resistance is imported KOA, Panasonic, Weishi, etc., making the sound purer and more transparent!
four.Chassis size: width 430mm*height 90mm*depth 360mm (single and double cow version)
five.This machine uses a tube:
The piping of the single transformer type is as follows:
1.Power rectifier tube: Shuguang 6Z4*2 (single cow version)
2.Small signal amplifier tube Noble Voice ECC83*2 (can be replaced with the following tubes, ECC83, ECC803S, 7025, 5751
3.Follow the output tube PSVANE ECC82*2 or ECC81*2 (the following tube can be replaced with ECC81, 6201)
Dual transformer type with tube:
1.Power rectifier tube: US 6×4 (or EZ90)*2
2.Small signal amplifier tube PSVANE general foot ECC83*2 (can be replaced with the following tubes, ECC83, ECC803S, 7025, 5751
3.Follow the output tube PSVANE general foot ECC82*2 or ECC81*2 (the following tube can be replaced with ECC81, 6201)
The tubes in the above package are all general-purpose tubes. What brand of tubes are specifically equipped with? According to the selected set.
six.The technical parameters are as follows:
(1) Frequency response: 5Hz-30kHz (no load), note: the American ATS-2 AP tester can only measure 30KHZ, the actual machine should exceed 50KHZ; 20HZ-33KHZ (with 3.3K load)
(2) Distortion: 0.012% (1KHZ, output 1V)
(3) Magnification: 14 times
(4) The maximum output is 14V ((with 3.3K load)
(5) Signal-to-noise ratio: 92dB
(6) Sensitivity: -58dB
(7) Input impedance: 100K
Note: No cables are included.
Version differentiation:
A:Single transformer non-balanced without tube
B:Single transformer non-balanced with tube(SHUGUANG 6Z4*2 PSVANE ECC82*2 ECC83*2)
C:Single transformer balance without tube
D:Single transformer balance with tube(SHUGUANG 6Z4*2 PSVANE ECC82*2 ECC83*2)
E:Double transformer non-balanced without tube
F:Double transformer non-balanced with tube(US 6X4*2 PSVANE ECC82*2 ECC83*2)
G:Double transformer balanced without tube
H:Double transformer balanced with tube(US 6X4*2 PSVANE ECC82*2 ECC83*2)
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