Chassis dimensions: 260X188X70mm
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Internal dimensions: 250X180X62mm
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1: Pure chassis = chassis + knob Switch power socket, rubber machine feet, screws, four RCA
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2: Complete machine = complete machine + power cord
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Why do this circuit?
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First, we analyze the advantages and disadvantages of differential circuits that have been popular for decades.
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In the audio circuits of the past few decades, the differential amplifier structure has a high occupancy rate. The input part of countless various operational amplifier circuits, pre-stage circuits and power amplifier circuits adopts this kind of amplifying structure. Mainly because differential amplification can effectively suppress environmental noise(Such as power clutter interference noise)And when the amplifier tubes are well paired and the thermal stability is consistent, the midpoint stability can be well ensured, and the amplified bandwidth can be up to DC. Therefore, many product designers did not hesitate as the best choice.
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But we must also see that this structure is not perfect. Even harmonic components in the music signal will be cancelled out due to common mode suppression and cannot be reproduced in the replayed listening sound field. Some players with higher listening requirements still use the oldest triode amplifier circuit. I was more impressed that the input part of a power amplifier designed by Mr. Andy Lau from Zibo, Shandong Province a few years ago did not use differential. The master who worked here at the time glanced at his circuit board and said, “It’s so mysterious.” Putting this circuit on the shelf, it took more than three years to put it away. When reviewing his circuit today, I couldn''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t help feeling that we are too easy to take common things as reasonable, and it is often easy to judge others'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' things without careful analysis.
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The circuit structure of this machine is very simple, and there are unexpected surprises in the scaffolding test. The schematic diagram is as follows:
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This machine is designed with independent power supply for each channel to improve the degree of separation. The amplified output part uses the second-hand disassembled Temulan signal cow(We can’t buy new ones of this kind of cow, and friends with obsessive-compulsive disorder can go around).
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This machine can be used as an amp to promote low- and medium-impedance headphones to obtain better listening effects.
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The whole machine has been adjusted, tested and finalized, and the listening feels that the sound is real and accurate, the sound details are quite rich and everything, the dynamics are large, the high and low frequencies are extended, and the overall is warm and durable.
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Basic performance parameters:
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Working method: Class A
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Signal to noise ratio: 105DB
\Frequency response: 20Hz to 50KHz
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Dynamic range: >100 dB
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Machine size: 260*70*188MM
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Whole machine weight: 3.5KG(Courier fee is charged at 4 kg with packaging)
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