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PIONEER EXCLUSIVE M4a Pioneer Exclusive Power Amplifier refurbished item japanDescriptionIntroduction. Thank you for looking at this well-maintained EXCLUSIVE M4a released in 1973. Starting with diagnosing the symptoms and identifying and repairing the faulty parts, we have replaced many faulty and deteriorated electronic parts with new ones, even if there is no problem at present but there is a risk of failure in the future. Furthermore, the exterior parts have been polished and restored, and the exterior has been carefully and painstakingly maintained. We have repaired and exhibited amplifiers of various manufacturers, and the Pioneer EXCLUSIVE series is one of our best maintenance items. It is essential to replace the electrolytic capacitors, which are consumable parts, and to clean the switch contacts to remove any dirt that may be caused by age. Especially, blackened switch contacts will cause noise, loss of sound, and other problems later on. Therefore, we have conducted various tests to identify the cause of the problem, and have done our best to revive this famous machine of yesteryear. Outline Manufacturer?PIONEER Pioneer Model?EXCLUSIVE Exclusive M4a Year: circa 1979 Price: 430,000 yen at the time of release The M4a was a high-end power amplifier released by Pioneers high-end audio brand, EXCLUSIVE, and while maintaining the elegant appearance of the M4a, it pursued the essence of audio even further, becoming a masterpiece that has fascinated listeners for years. The M4a features the same “pure Class-A amplification circuitry” inherited from the M4, but with an ultra-thick copper foil base, oxygen-free internal wiring, and selection of higher quality components to reduce unnecessary resistance as much as possible. The “H” was manufactured with specifications that would be considered unacceptable in todays audio industry due to the increased cost. As for my impression, The wood cabinet is not only beautiful to look at, but also has the ability to reproduce the performers passion, the engineers mixing technique, and the dynamics of the intensity and weakness of the sound. The unique “sheen” of sound that this amp possesses is truly superb. This is a masterpiece that is in no way inferior to todays high-end audio equipment. This is a great machine from the past, and we hope you will take this opportunity to try it out. This is a great machine that is a masterpiece of yesteryear. The sound is coming out from both left and right speakers. The balance between the left and right speakers is also fine. The settings of each part have been adjusted to the optimum values in accordance with the service manual. All the switches are working and there is no problem. The bottom cooling fan is in good working order. The fan for cooling the lower part of the unit is also working without any problem. Appearance. ?Wood cabinet has been finished as beautifully as possible and is in such a beautiful condition that it is hard to believe that this amp is about 50 years old. ?The front panel has no major scratches. The speaker terminals have been replaced with high quality speaker terminals. The front panel is in excellent condition! We highly recommend it to those who are looking for a good condition unit. Maintenance details In addition to basic maintenance, Replaced the semi-fixed resistor that was causing the failure. The 6 transistors and electrolytic capacitors on the protection board have been replaced. In selecting replacement parts, we asked ourselves, “Can we upgrade the parts with more modern technology without losing the original characteristics? With this in mind, we compared various high-quality, high-quality sound parts and adopted the most suitable ones after repeated verification. The transistor to be replaced is basically the same model number as the original to maintain the original sound quality (alternative model numbers are used for those that are difficult to obtain). Operating conditions before maintenance and servicing Protection is applied after a while after turning on the power (cause: semi-fixed resistor and deteriorated transistor). ?After repairing the above symptoms, the following maintenance and restoration work is being performed. Maintenance and repair work ?Cleaning of the contact points of front switches such as input switching SW ? Cleaning of protect relay disassembled ?Replacement of all speaker terminals ?Replacement of power fuses ?Power amplifier board... All transistors are measured and all are good. All transistors were measured and all are good. Replace the semi-fixed resistors with new ones. Measured all electrolytic capacitors. Power supply board... Measurement of electrolytic capacitor and transistor. Applied heat radiation grease to medium size transistor and rectifier parts. VU meter board... Measured electrolytic capacitors and transistors. ?Protection board... Measured electrolytic capacitors and replaced all of them because they were deteriorated. Transistors were measured and replaced with new ones. ?Restoration of external appearance... Cleaning of front and rear panels. Front and rear panels cleaned. -Wood cabinet cleaned, repaired and oil finished. ?Cleaning of inside and rear pin terminals including circuit board. ?Resoldering of floating solder and solder cracks on the board. ?Internal voltage, DC offset, idling and VU meter adjustment.Shipping 15business days International Buyers - Please Note: 1.Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyers responsibility. Please check with your countrys customs office to determine what these additional costs will be prior to bidding or buying. 2.Heres how to ensure you can safely use Japanese devices abroad: 1.Voltage: Japan uses 100V, but many countries use 220V or 240V, so you may need a voltage converter. 2.Plug Type: Plug shapes vary by country, so you might need a plug adapter. 3.Frequency: Different frequencies can affect devices, so check if your device is compatible or use a converter. By checking these points, you can safely use Japanese devices overseas. Thank you for your understanding.
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