Description
Amplifier Accuphase E-301 100V Japan Japan, 100 volts. 1982 year of manufacture, May. In perfect condition. No hidden defects or other problems. Excellent safety of the thing, although many years. Sound, like the coolest amplifiers. Complete restoration of the amplifier, to a new technical condition. Made for another 40 years, full operation. Soldering of all boards (quality higher than the factory). Cleaning of switches, regulators, relays, with their complete disassembly (not sprayed). Replacement of all electrolytics, the best, fresh, not fake, not Chinese (they can say; they are still good there :), because its all a hassle, to look for real ones, wait and change, believe me). An integrated amplifier created on the basis of the high-class amplifier development technology that Accu?h?se has been developing for many years. A MOS field-effect transistor is used as an output element in the power amplifier section. Since the MOS field-effect transistor is a voltage control type and a wide-band element, its characteristics are that it prevents the occurrence of point distortions that affect the sound quality in the high-frequency range, and that it does not require power supply from the previous stage. Thus, the load on the front stage becomes less, it is easy to select an element with excellent characteristics for the drive stage, and we managed to improve the characteristics of the entire power amplifier section.Moreover, since the last stage is wideband, a wide bandwidth in the NF circuit is possible, and the generation of harmful TIM in the form of dynamic distortion is prevented.In addition, the input stage is a FET buffer input, and the next stage is a push-pull configuration for differential amplification, so that all gain stages are in a push-pull configuration.In addition, a direct-coupled amplifier having no input capacitor is designed by measuring the stability with a constant-current servo system from IC. The high-level gain section of the preamplifier has a configuration in which the input is a buffer with two FETs, the next stage is differential amplification with an op amp, and the final stage is a wideband complementary push-pull.By disconnecting the input capacitor with a FET, the coupling capacitor at the output is also removed by the constant-current servo system, and a complete direct-coupled circuit from input to output is created. In the equalizer amplifier section, the input consists of a field-effect transistor buffer and forms a direct coupling input from which the coupling capacitor is removed. When the mirror effect occurs at this stage, the frequency response of the amplifier itself changes due to the inductance of the cartridge and the dissipation power, and the original sound quality of the cartridge is distorted. To prevent this, the E-301 uses a Miller effect suppression circuit in combination with the FET input.Next to the field-effect transistor, it undergoes differential amplification and is amplified by a Darlington, and the final stage consists of an additional push-pull circuit.The whole circuit is stabilized by a DC servo system, the output capacitor is also removed, and it is a complete direct connection system from the DISK (MM) to the output stage of the power amplifier.In addition, there is a dial impedance switch that switches the input impedance at the time of MM measurement. The head amplifier is equipped with a direct-connection differential push-pull amplifier ICL without a capacitor input, and the output stage has a complete push-pull configuration of an additional push-pull stage. In addition, outstanding sensitivity is achieved by using a low-noise element and a low-impedance circuit. In order to suppress interference between single amplifiers and maintain a low impedance power supply over a wide range, a multiple power supply method is used in which a separate independent DC power supply is connected to each circuit of the high-level amplifier, equalizer, and head amplifier. This is adopted.They are located on each printed circuit board, and the element is supplied with voltage at the shortest distance. A tone control is used, which provided switching of the rotation speed.The rotation speed can be switched between high and low in two steps, and an on-off switch is also installed to cancel the tone control. It is equipped with a volume compensator that automatically corrects audibility at low volumes and adjusts the energy balance.You can select two types of correction curves and enjoy powerful sound reproduction even at low volumes. A subsonic filter is used to prevent cross-modulation distortion due to ultra-low frequency noise.
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