In August 1999, AVIC (Zhuhai) Enterprise Group Zhuhai Spark Electronic Equipment Co., Ltd. ushered in its 6th anniversary. On this festive day, we would like to extend our sincere congratulations to all the employees of Spark Corporation, and wish Spark Corporation to write a new chapter in China's audio industry under the banner of the defense industry.
Cayin230C is a high-performance and cost-effective tone power amplifier for music lovers launched by Spark. It has the characteristics of wide frequency response, high signal-to-noise ratio, low distortion, natural sound and so on.
The principle circuit of Cayin230C is shown in the attached drawings. In the way of processing signal input, Cayin230C uses high-quality relays for switching selection. The advantage of this design is that it can shorten the input signal process, reduce the loss of audio signals, and also minimize crosstalk. Cayin230C adopts passive front-end circuit mode; the amplifying circuit is a fully symmetric complementary design: the input stage uses the audio-specific low-noise field effect tube K246 / J103 produced by Toshiba Corporation and the transistor C2240 / A970 to form a common-source-based differential input circuit; The pre-excitation stage uses the audio special tube C2705 / A1145 produced by Toshiba for voltage amplification. The excitation stage uses Hitachi mid-power fever MOS-FET to promote the tube K214 / J77; the final stage power amplification uses high power and high reliability. The high Ft value of warm and mellow Hitachi audio special field effect is output in parallel to the K1058 / J162 multi-tube. The parallel connection of multiple tubes requires high tube pairing, which is directly related to the stability of the tube work. During the assembly process, all the tubes of Cayin230C are strictly tested and matched by the factory to ensure the quality of the amplifier. The multi-tube parallel design can reduce the internal resistance of the amplifier and increase the damping coefficient of the amplifier, thereby effectively improving the drive control ability of the amplifier to the speaker system, and can also drive the low-efficiency speakers well. In order to ensure that the amplifier can work stably and prevent the temperature from being too high to burn the power amplifier tube, Cayin230C especially uses a large radiator. In addition, the upper and lower bottom covers of the amplifier casing are designed with heat dissipation holes to facilitate air convection and heat dissipation, so that the amplifier can work for a long time under a larger power output.
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The power supply has a critical influence on the performance of the amplifier, so the Cayin230C uses a large-scale high-quality toroidal power transformer manufactured by Spark factory, model OB112, and is packaged in a round steel shielding box to avoid the circuit. Interference. In order to ensure the amplifier's control of the speaker during large dynamic replay, Cayin230C uses a large-capacity audio special filter electrolytic capacitor with a capacity of nearly 60,000 microfarads. At the same time, in order to improve the performance of high frequency bands and ensure the consistency of high and low frequency characteristics, a small capacity and high quality are connected in parallel. Polypropylene MKP capacitors. The perfect power supply system provides ample and stable current for the power amplifier, independently supplies high and low voltages for the front and rear stages, and independently supplies power for the left and right channel power amplifier stages, completely eliminating the mutual influence caused by the power supply of each part.
In order to protect the amplifier and speaker system from damage due to overload or accidental misoperation, Cayin230C is designed with a new type of high-reliability protection circuit. The protection chip uses μPC1237HA, which has midpoint drift, overcurrent overload protection, and startup delay squelch , Shutdown noise reduction, AC power inspection and other functions.
Cayin230C volume control adopts the square blue plastic potentiometer produced by Japan ALPS, the left and right channels are well balanced, and the operation is very stable. The signal switch selector switch also uses advanced varieties, which feel very comfortable when rotating. In particular, each channel is equipped with two sets of output, which can be suitable for two-line crossover and multi-speaker connection.
The Cayin230C adopts a simple and bright design. The panel is made of two black gray and one champagne gold aluminum panel. The surface is brushed and anodized, and the thickness is up to 10mm. The power switch adopts the button type, the volume control and the signal switching knob are stamped and formed from aluminum ingots, giving a solid and heavy sense of the materials.
Cayin230C has high analytical power and excellent sound localization ability, and can well reproduce the weak details in the recording of the record, thus giving the audience an immersive live experience. Cayin230C's frequency bands are well-balanced in volume distribution, thick and flexible at low frequencies, full and round at mid-range, delicate and bright at high frequencies, clear and transparent sound field reproduction, due to the application of field effect tubes, the sound is delicate and natural, with a warm and mellow style of tube machine, pleasant and beautiful , Listen to tirelessly for a long time. It is suitable for music lovers who have high requirements on timbre reproduction performance.
Main technical parameters: rated output power 90W + 90W (8Ω); frequency response 8Hz ~ 45kHz; input sensitivity 340mV (90W, 1kHz, 8Ω); total harmonic distortion ≤0.07%; signal-to-noise ratio 91dB; power supply voltage: AC220V ± 10%; Weight: 12.5kg.
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