Description
Toshiba AUREX ?MOS-FET power amplifier SC-?90F inspected and maintained (AC inlet.LED specification)-------------------------------------------------- -------------------------------------------------- ---------------------A vintage stereo power amplifier from around 1982. _021ADeveloped as an amplifier compatible with the digital audio era based on the technology cultivated with the SC-?99 and SY-?88II.Equipped with newly developed complementary power MOS FET.This power MOS FET developed by Aurex uses a double diffusion structure called ?-MOS.In addition to realizing high breakdown voltage, it also has high gain and high speed.For the source resistance of the power MOS FET in the output stage, a ? resistor with a copper resistor, which was also used in the ?99, is used.As a result, all paths through which large currents flow are unified by elements using copper, creating a ? loop circuit that does not mix different metals.This is the last power amplifier of Toshiba Aurex brand. Click here for detailed specifications of the amplifier. ? https://audio-heritage.jp/AUREX/amp/sc-lambda90f.html Inspection and maintenance were carried out. ?Internal cleaning, dust removal, rust prevention?Cleaning of front panel, back panel, and operation buttons ?IPA sterilization?Clean the speaker terminals, polish and clean the RCA terminals (see photo)?Disassemble and clean the AC rush current control relay and two protect SP relays.?Remove the copper foil styrene capacitor, measure it, confirm its normality, and reinstall it.?Remove and measure the u?-II type ? capacitor and GU capacitor, check the capacity, and reinstall.?Replaced some electrolytic capacitors and replaced fuse resistors.?Reinforce solder for deteriorated solder parts?Completely disassemble the motor drive volume, grease the gear part, and reassemble.?Clean the parts surfaces of all boards with IPA?Polish and clean the tube fuses (3 fuses in the power supply section)?±B voltage confirmation, DC offset adjustment, idling adjustment?Readjust the power meter reading The following points differ from the original.- Changed the lighting lamp of the large peak meter to LED. (I dont think you have to worry about it breaking for the time being.)?Because the blue component of color correction remains, the background color has a slightly pale blue tint.- Like the original, you can change the brightness with the DIMMER switch.?The direct-attached AC cable has been removed and a new AC inlet has been installed. Improves wiring management. In order to objectively judge the performance, we measured it with an analyzer. (VP-7723B)?Maximum output ? (143W into 8? 1kHz)?Distortion rate?(0.010% into 100W 1kHz)?SN ratio?(118dB IHF-A)?Residual noise?(0.033mV) Usability?The motor drive volume is working normally.?DIRECT and VARIABLE both work properly.- Broadband, good response, and a bright and powerful impression.?This is a high-quality amplifier that makes extensive use of ?-MOS_FET devices, ? capacitors, and metal foil silicone.- Logarithmically compressed peak display, so unlike a VU meter, it does not feel sluggish and provides a refreshing display. Vintage from about 41 years ago.Although I have carefully cleaned it, there are scratches, dirt, deformation, etc. There are some scratches and dirt that cannot be captured in photos.All contact parts, which are the channels through which sound passes, have been disassembled for cleaning or replaced, so they are highly reliable and can be used with peace of mind.A good amp requires a good source and good speakers to match its performance. 100% official productIt is also sold in Japan, so please purchase it as soon as possible. Import duties, taxes and fees are not included in the item price or shipping charges. These charges are the responsibility of the buyer. Please check with your countrys customs office to determine how much these additional costs will be before bidding or purchasing. Items are to Japanese specifications.? All electrical appliances are 100V compatible. Remote area fees may apply.
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