![]() It is equipped with a line straight switch which can obtain high quality sound by directly connecting an equalizer amplifier and a power amplifier. This eliminates the need to worry about the coloring of sound caused by capacitors, and realizes high-resolution sound quality. The feedback point of the DC servo is not the first stage but the second stage bias power supply so that the servo circuit does not affect the SN ratio.Īs a result, the S / N ratio is 74 dB, which is close to the theoretical limit of 76 dB due to the thermal noise of transistors in this circuit system.ĭC servo circuits are used for each of the MC head amplifier, equalizer amplifier, and power amplifier.Īs a result, all coupling capacitors from the MC input to the speaker output have been removed, and all stages have been switched to non-coupling capacitors. In addition, the input is parallel push-pull with ultra-low-noise FET. The MC head amplifier has a push-pull configuration from the input to the output. Therefore, the generation of distortion due to the nonlinearity of the power amplifier is suppressed, the effect of reaction signal from the speaker is eliminated, and the distortion factor of the power unit is further reduced. Moreover, the operation of the voltage amplifier is stable and the power amplifier can be driven with low output impedance (constant voltage drive). The input impedance of the FET is close to infinity, and even if the power amplifier receives load impedance fluctuations due to its nature, the effects do not appear on the input side. As a result, music contamination caused by switching distortion is fundamentally suppressed.Īn FET buffer circuit is adopted between the voltage and power amplifiers to completely separate the voltage and power amplifiers, greatly improving the bare characteristics before applying NFB. Pioneer's proprietary high-speed bias servo circuit controls the bias current according to the input signal to keep the transistor in operation at all times. ![]() ![]() The power section is equipped with an established non-switching circuit that realizes 0 switching distortion. In addition, we use non-magnetic parts such as copper lead wires and oxygen-free copper wires in the power supply to eliminate harmful magnetic distortion. Eight electrolytic capacitors are installed for a total capacitance of 176,000 μ F. The transformer employs a large toroidal transformer characterized by low flux leakage and high regulation. This design prevents waveform loss due to delay. In addition, when a large signal repeatedly enters over a wide area, the high-voltage section remains locked as long as the signal continues. In addition, the high voltage section always follows the signal waveform with a constant voltage value, so that no waveform loss occurs. This greatly reduces the loss at the output-stage and enables high power. In this system, low voltage section (V L) and high voltage section (V HThe power supply circuit drives only the low-voltage part at the normal signal level and drives only the high-voltage part at the time of Tsutomu Dainyu. This pre-main amplifier was developed with the theme of high quality and dynamic range of the amplifier itself.īy adopting dynamic power supply system and non-switching circuit, the concept of real dynamism is reflected in the overall to realize high power with high quality.Ī dynamic power supply system is used for the power supply part in order to cope with a wide dynamic range of the source and to make the speaker sound as much as possible even at large input.
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