Description
Accuphase A-45 Pure Class A Stereo Power Amplifier Description Condition: Used The entire amplifier is constructed using the latest instrumentation amplifier method. This method uses a fully balanced signal path from the input terminal to the power amplifier stage, which not only provides excellent characteristics such as CMRR (Common Mode Rejection Ratio) and distortion, but also has resistance to changes in the surrounding environment such as external noise, improving the stability and reliability of the power amplifier. The amplifier section is equipped with an MCS+ circuit and a current feedback amplifier circuit to further improve electrical performance. MCS (Multiple Circuit Summing-up) is a circuit method that improves various characteristics by connecting identical circuits in parallel. The MCS+ circuit is a further evolution of this circuit, and achieves even lower noise by extending the part that operates in parallel to the Class A drive stage of the current-voltage conversion section. The current feedback amplifier circuit is a method of feeding back the output signal in the form of a current, and since the impedance of the feedback input section is extremely low, phase rotation is unlikely to occur, and various characteristics can be significantly improved with a small amount of NFB. The output element uses power MOS-FETs, which are known for their sound quality and reliability, and is driven in a 6-parallel push-pull configuration per channel. MOS-FETs have a negative characteristic when it comes to heat, so it is possible to obtain thermally stable operation. This is a pure Class A system that brings out the charm of music. The power supply section uses a large, highly efficient toroidal transformer with a maximum output of 600VA, and the smoothing capacitor uses a large-capacity capacitor of 47,000?Fx2. It is equipped with four-stage gain control. This function is performed by switching the gain in the first stage amplification section of the instrumentation amplifier system, and residual noise is also reduced. It uses a fully balanced input circuit, and is configured to be less susceptible to external induced noise. The copper foil surface of the printed board and the main components of the signal path are gold plated. It is equipped with a large analog power meter. The meter OFF function and sensitivity switching are also possible. The speaker terminals use large terminals that can be used with Y-lugs and banana plugs. The A-45 supports bridge connection and can be used as a high-power mono power amplifier. The mode switch switches between dual mono, stereo, and bridged connections. Maximum external dimensions: Width 465 x Height 211 x Depth 464 mm Weight: 30.9 kg Each input sound output has been checked with balanced and unbalanced connections. My impression of listening to it was that it was an Accuphase product! It was clear and distortion-free, with a different resolution. The sound was crisp and detailed, and the mid-low range was solid, giving a sense of the power supplys margin and good construction. Of course, the preamp, installation method, and power cable selection will also affect the sound. The exterior shows some signs of use, but there are few scratches and it is in good condition. However, if you look closely, there are small scratches and scuffs on each corner and ceiling. There is also a scratch on the top corner of the front panel. Please check the images for each one. (I tried to take a picture so that it would be easy to understand.) Items reflected in the background other than the power amplifier unit pair, power cable, and copy of the instruction manual are not included. It is unclear whether the power cable is genuine or not. (The wiring says 2.0mm OFC.) Payment Please pay within 5 days after the auction closed. Shipping About other area, please ask me. When you purchase two or more my items, I can send them together and discount shipping cost. Returns Returns are accepted ONLY if the item was not the item described. International Buyers - Please Note: * Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyers responsibility. * Please check with your countrys customs office to determine what these additional costs will be prior to bidding/buying. * 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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