JCDQ28 imitation British X10-D audio fax tube buffer front-end finished board: imitation according to the actual 1:1, the original machine is a single panel, the headquarters is improved to a double panel, to improve the effect and grade. Exquisite FR4 double-sided glass fiber board, Shenjin high-quality PCB board. The thickness of the plate is 2mm, and the thick plate is not easy to deform. Size: 178×65mm. AC 12V 1000mA power supply is sufficient.
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The British "X10-D" audio fax is a product launched in the mid-1990s. It has excellent sound effects and a unique appearance. It is also a sensation after being put on the market. Its function and advantages are: connecting it between digital audio sources such as VCD, CD, DVD, optical drive and power amplifier, can greatly reduce the "digital taste" and "transistor sound", so that the entire audio system brings a sweet The natural "bile taste", because the function is located after the CD, before the power amplifier, most of them are regarded as part of the pre-stage, also known as no gain (no amplification) pre-stage.
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"X10-D" audio fax index: distortion 0.008% (10Hz ~ 100KHz), frequency response: 10Hz ~ 100KHz (±0.2db), output impedance: 200Ω, no gain, input and output signal 1:1, use 6DJ8 (6DJ8) Two, AC 12V 1000mA power supply, power supply sub-tube boosted to ±30V DC through the internal circuit.
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"X10-D" audio fax has three unique ingenious points in design
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1: Deeper negative feedback is used at the output, reaching a very high index, and the distortion rate drops to an astonishing level.
2: The designer cleverly uses 6922 (6DJ8) to have a good linearity and working state when the screen voltage is as low as 50V. It uses AC 12V low-voltage power supply and boosts to ±28V power supply, which can significantly extend the life of the bile duct and improve the reliability Noise ratio.
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3: Positive and negative DC power supply, eliminating the cathode resistance and capacitance of the second-stage amplifier tube, eliminating the negative effects caused by the cathode resistance and capacitance, you can also use all the components of the transistor equipment, without the need to use high price and large size High voltage components.
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The imitation products of this part are better than the original components in circuit board materials, resistors, filter capacitors, coupling capacitors, tube sockets and other components. Use imported second-hand electron tubes, boost filter electrolysis use EFC electrolysis, filament filter TEAPO Tianbao gold word electrolysis, coupling capacitors are Swedish EVOX and German WIMA varieties, silver-plated ceramic electronic tube holder (better than original plastic tube holder), Japan KOA high precision /4W resistance, sound quality and effect are better than the original.
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JCDQ28 is equipped with domestic 6N11 finished board.
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JCDQ28AB finished board is not equipped with electronic tube.
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Board code: JCDQ-28
Note: The output is AC, not DC!
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Board characteristics: double-sided gold-plated board, board thickness 2mm, 72 μm thick copper foil. The 9-pin tube base is designed for both flat foot holes and round foot holes. The flat foot holes are suitable for universal tube seats, and the round foot holes are suitable for CMC high-end Teflon tube seats or ceramic bakelite tube seats.
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Affirmation: Two 6DJ8s are second-hand disassembled products. The components on the finished board are different due to different assembly batches. The types, brands, models, and specifications of some components will be slightly different. Shall prevail! Some components on the circuit board are second-hand disassembled products, and the finished board is sold normally.
