Ma&Ke JC-2 line Gold Sealed Tube Class A preamplifier front-end field-effect transistor input HIFI remote control Bluetooth 5.0 optional
Product Name: JC2 Line Class A Pre Grade
Input voltage: AC220V AC110V
Product specifications: 430MM * 70MM * 310MM deep
Frequency response: 20HZ-20KHZ (+0-0.1db)
Input impedance: 50K
Magnification factor: 6x
Signal to Noise Ratio: 100db
Input and output interfaces: RCA can be optionally equipped with Bluetooth 5.0 (with Bluetooth version RCA input of 3 channels)
Weight: 8KG
Channel: 2
Amplifier type: HIFI amplifier
Rated voltage: 36V
Power Supply: The left and right sides of the power supply are designed completely independently, with dual transformers for power supply. The transformers are made of specially customized pure copper wire and imported steel sheets, with a power of 30VA each and 15V each. Each machine uses two transformers, and each channel is supplied with one transformer. 16 2200UF filters are used to ensure the purity of the power supply. After being stabilized by 337, a large number of heating elements are added to the front-end power supply to ensure long-term stable operation and sound quality of the circuit, which is very important; A large number of German Red Weimar and imported Golden Robe Yina D-class capacitors have been added to the voltage regulator bypass and filtering
Coupling part: American EC 275 coupling capacitor, transparent and round sound, sweet vocals, balanced three frequencies
Amplification circuit: Using field-effect transistor as the input stage, driving the gold sealed transistor 2N2219 2N2905 to amplify the output, in a pure A-class working state, ensuring a sweet and durable sound
Input selection circuit: The carefully designed four-way input circuit minimizes signal routing and is controlled by four relays, including imported TAKAMISAWA and Omron relays (original and original)
Potentiometer selection: ALPS 27 type potentiometer is used, with excellent balance and durability. It can be said that this type of potentiometer will not break even after 20 years of use. The remote control version is selected with a motor, while the regular version uses the 27 type potentiometer
A power socket with integrated fuse, convenient and practical
Field tube input, driving gold sealed tube output, static current and midpoint can be adjusted separately, and can work in Class A amplification. Four coupling capacitors are all imported from the United States EC audiofrequency capacitors, with outstanding sound quality
CBB class, a large number of German Red Weimar are used, and the front-end capacitors are made of ELNA Gold Robe. The rectification and filtering part uses a large capacitor array with a total of 16 2200UF electrolytic filters to stabilize the voltage, which are then further filtered by RC and inductance before being supplied to the amplification circuit
Some friends often ask me, "Can we use high-end capacitors like Weimar on the power supply? Is it a bit wasteful?" I can only say that you can't reach the level of fever. When you reach the hottest point, don't talk about the components used. Some audiophiles are even very particular about Rose. Of course, fever comes step by step, and it's a process from low to high to understand its meaning
This front-end board is optimized and designed according to the original circuit, with reasonable wiring and no noise, carrying the original machine style, natural sound, and a choice for high fever
This front-end refers to the JC-2 line optimization and wiring improvement, retaining the original machine style, pure Class A amplification, and using field-effect transistors for input tubes, resulting in a sweet sound
Output with gold sealed tube, high current Class A amplifier, warm sound, good vocals, sufficient thrust, coupling capacitor with American EC, transformer with specially customized shielding cow, one machine uses two, left and right channels are completely independent, and the whole machine is basically equipped with heating components
