Beschreibung
This sale is for a Pioneer SX-828 in restored condition and proper working order. The cabinet was re-veneered in Dark Walnut and finished with a Danish oil rub. The receiver was restored by audio Tech extraordinaire, Kelly Wilson Excalibur Audio. Here is a summary of the work Kelly performed on this receiver. As you will see nothing was spared on the reconstruction of this unit. - Comes with a set of speaker connects designed for this receiver. Hi Larry,Here are the details for this repair.This is the most extensive overhaul that I have ever had to perform on aunit.Here is a list of what I could remember but I might have forgotten athing or two just because this unit took me so long.Pioneer SX-828 Work PerformedA total of about 35 hours was spent on this receiver and all boards havebeen serviced.A complete recap has been done with good quality name brand high tempcaps with all original values except for the main filter caps which wereupdated from 8000mfd to 10000mfd as the cost was the same and a littleextra headroom would be obtained. Bracket adapters were created and 3Dprinted to allow new main filter capacitors to be installed in the stocklocation.There were extensively faulty and noisy transistors in certain stages ofthis amplifier and the main amp driver board has had all the signal,pre-driver and driver transistors replaced with modern Epitaxialtransistors that have as close to original specs as possible. The biasand offset adjustment pots were replaced with high quality multi-turnversions to allow for accurate adjustment later.The protection board has also had transistors replaced due toinstability and the relay was disassembled repaired and cleaned.The output transistors were all removed from the heat sink and testedfor beta to make sure that they were not stressed and were re-installedwith all new mica insulators and compound.Controls and switches were all cleaned and lubricated and all the pilotand indicator lamps in this unit have been replaced with LEDs in theoriginal color spectrum.Extensive cleaning and polishing was done to the face plate andpoly-carbonate window as it was scratched pretty badly.The main amplifier stage was setup with the most common specs availablefor this unit and the bias was set to 20mv warm and the DC offset wassuccessfully zeroed.This unit was torture tested for several hours and the bias remainedstable for the whole test. The unit remained clean sounding with a quietnoise floor and the tuner received stations well with good stereoseparation.There were some stripped screws in the bottom of the case and incorrectscrews were installed in the unit when received. These holes werere-tapped to accommodate 10-24 metal screws and new screws wereinstalled as well as the heat sink cover having a broken screw whichrequired extraction and replacement. DescriptionThe SX-828 is a big power AM/FM stereo receiver with advanced circuit design, outstanding FM selectivity and sensitivity, and linear scale tuning dial.Here, in one of Pioneers most prized packages, is a wealth of outstanding performance in an AM/FM solid state stereo receiver.The SX-828 is another in the long, proud line of advanced stereo components from Pioneer - and certainly one of the best.For music power that will fill any-sized room with clear, rich sound, the SX-828 features up to 270 watts (at 4 ohms).For FM selectivity and sensitivity that has no peer in a unit of this size, the unit features a large linear scale tuning dial, the latest solid state circuitry, and a pair of FM tuning meters.And, finally, for the supreme versatility that is so necessary to quality hi-fi today, it provides two tape monitor circuits for tape-to-tape duplication, and lets you use up to two turntables, three sets of speaker systems, two microphones and even too sets of headphones.All in one handsomely-designed, ruggedly built unit from the quality stereo people at Pioneer.SpecificationsTuning range: FM, MWPower output: 54 watts per channel into 8? (stereo)Frequency response: 5Hz to 80kHzTotal harmonic distortion: 0.5%Damping factor: 40Input sensitivity: 2.6mV (mic), 0.115mV (MC), 2.7mV (MM), 200mV (DIN), 200mV (line)Signal to noise ratio: 85dB (MM), 95dB (line)Output: 200mV (line), 35mV (DIN)Speaker load impedance: 4? to 16?Semiconductors: 6 x FET, 4 x IC, 55 x transistors, 36 x diodesDimensions: 485 x 150 x 375mmWeight: 14.8kg
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