Description
DENON PMA-2000AE Integrated Amplifier From Japan UsedDescriptionThis pre-main amplifier was developed as the successor to the PMA-2000IV. The model name AE stands for Advanced Evolution, and it is positioned as a product in the vein of the SA series. The output stage uses a single push-pull circuit with UHC (Ultra High Current)-MOS.The smallest unit of amplification elements has a current supply capacity of 3 to 10 times the normal level, realizing both delicate expression and high power. The power supply section consists of a power supply circuit for the preamplifier, which requires a stable voltage, and a power supply circuit for the output stage, which requires a large current, each separated from the winding of the power transformer. This configuration eliminates the influence of the operating current of the output stage and improves the resolution of the preamplifier section, which handles small signals.In addition, a high-current Schottky barrier diode is used for rectification, supporting the expressive power of the UHC-MOS with its low noise characteristics and high-speed operation. In addition, large-capacity block-type electrolytic capacitors for audio use are used for the power supply capacitors to obtain a stable and clean power supply. The power transformer is made up of two transformers connected in parallel, which greatly improves the electrical and magnetic characteristics.The L.C. (Leakage Canceling) mounting method, which cancels each others magnetic effects, also reduces flux leakage, which is a source of noise in the amplifier.Furthermore, the transformer is mounted using a combination of special resin and anti-vibration materials to enhance the floating effect and eliminate any adverse effects on sound quality. The power amp is equipped with a power amp direct terminal for direct connection from other preamplifiers to the power amp, and a pre-out terminal for connection to other power amps, subwoofers, etc. The power amp direct terminal is also available for connection to a subwoofer, etc.The power amp direct function can be switched on and off with a switch on the front panel. In addition, the pre-out terminal outputs from a discrete flat amplifier with MOS-FET outputs, and other considerations for sound quality have been taken into account. By reviewing each of the volume circuit, tone circuit, and power amplifier circuit, the upper limit of frequency in actual use has been secured up to 100kHz. The Precision Signal Ground circuit is used to stabilize the ground potential by reducing the noise that flows into the ground circuit, which is the reference for signal amplification. In order to thoroughly minimize the effects of vibration on sound quality, a Precision Mechanical Ground structure has been adopted with a revised vibration isolation structure, and measures are taken to effectively eliminate the effects of external and internal vibrations in the mounting and positioning of various parts to improve transparency and sound image localization.The power transformer, which is a source of vibration, is mounted on a floating structure using multiple vibration-damping materials. The radiator is dumped by elastic materials and radiator stabilizers and directly mounted close to the legs to suppress interference with other vibration sources such as power transformers. Model Pre-Main Amplifier
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