Description
Nakamichi Nakamichi Stereo Power Amplifier PA-50CE (Custom Edition) Operational ItemThis is a working item. Please note that there may be some scratches, scratches, etc.How about taking this opportunity??A stereo power amplifier announced as a custom edition of the PA-50.The STASIS method is adopted as the circuit configuration.The STASIS method consists of a STASIS circuit (pure class A operation) that keeps the amplification element in a steady state (STASIS) so that it always works in the most linear state, and a current mirror bootstrap section (AB These circuits drive the speakers in parallel, achieving high stability and excellent drive ability, and eliminating overall NFB.A total of 24 PC130W class power transistors (STASIS section: 2 parallel, current mirror bootstrap section: 4 parallel) are used to achieve high current supply capability.In addition, the output sides of all power transistors are directly connected with gold-plated copper busbars to equalize the impedance between each transistor and the speaker terminals.The power supply section has a huge capacity that can easily produce a rated output of 500W/ch or more if it is a normal design. By deliberately using half of these, we have improved the current supply capability and increased the drive power of the speaker.The power transformer uses a custom-made toroidal power transformer exclusively for the 470VA Custom Edition, which has significantly improved regulation characteristics in actual operation. In addition, the electrolytic capacitor is equipped with 47,000?Fx2 custom-made film capacitors exclusively for the custom edition with original tuning.It is also equipped with a high-speed diode bridge and inrush current limiter that boast excellent response.The chassis structure uses a method called a skeleton chassis.In this method, the transformer and capacitor are mounted on a thick chassis that runs through the front and back, and a sturdy frame is assembled around it with steel angles.Resonance is reduced by applying a thick electrodeposition coating to all the steel parts that make up the chassis.In addition, the heat sink uses a completely integrated, ultra-large heat sink, which has a seamless structure that equalizes the temperature conditions between the power transistors and increases the rigidity of the housing.Furthermore, the top cover uses a 3mm thick aluminum top cover.The AC cable, power switch, and inrush current limiter are isolated from the audio section to eliminate any effect on sound quality.Equipped with two types of output terminals: a normal binding post type and a large vise type made from machined brass. Both terminals are gold plated. It also supports bi-wiring connections.Gold-plated input terminals are used as input terminals. Nakamichis original oxygen-free copper single wire cable (core wire diameter 3.4mm) is used for the speaker and power supply wiring.The board uses an oxygen-free copper foil printed circuit board.Adopts oxygen-free copper AC power cord.Equipped with a high-speed multi-sensing protector that brings out the power transistors capabilities through real-time multi-point observation.A damping type power supply fuse filled with ceramic powder is used.The front panel is engraved with Custom Edition.At the time of shipment from the factory, each unit underwent a sound quality check using B&Ws 801 monitor speakers and a dedicated tester.Model stereo power amplifierRated output 150W+150W (8?, both channels driven, 20Hz to 20kHz, THD0.05%)Frequency characteristics 20Hz to 20kHz +0 -0.2dB (1W, new IHF)S/N ratio 120dB or more (IHF, A-WTD, input short, rated output)Total harmonic distortion rate 0.05% (rated output, 20Hz to 20kHz)Maximum output current 70A (per channel)Power consumption maximum 650WExternal dimensions Width 435x Height 157x Depth 421mmWeight approx. 21.5kgFor remote delivery areas, additional fees will be charged. Import duties,taxes and charges are not included in the item price or shipping charges. These charges are the buyers responsibility. These charges are normally collected by the delivering freight(shipping) company or when you pick the item up. -do not confuse them for additional shipping charges. We do not mark merchandise values below value or mark items as gifts. -US and International government regulations prohibit such behavior.
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