Garden Grove, CA, United States
About this listing
Pioneer SX-850 65 WPC Stereo Receiver – PRO RESTORED – 1-Year WarrantyUp for sale is the Pioneer SX-850, a classic vintage stereo receiver from Pioneer's highly regarded receiver era of the mid-1970s.The SX-850 combines a substantial 65-watt-per-channel amplifier section with a sensitive AM/FM tuner, versatile input connectivity, two-system speaker drive, separable pre/main operation, and a carefully engineered phono stage. Its combination of classic Pioneer construction, substantial controls, and large tuning display makes it an especially appealing model for vintage audio enthusiasts.This unit has been professionally restored, serviced, and tested by HQaudios while preserving the original engineering, appearance, and vintage character of the Pioneer SX-850. It has been prepared for reliable operation in a properly matched vintage audio system.1/ Key HighlightsAuthentic Pioneer SX-850 Stereo Receiver65W per channel into 8 ohmsAM/FM tuner with dual tuning metersTwo-system speaker drive with A / B / A+B operationSeparable preamplifier and power amplifier configurationProfessionally restored and serviced by HQaudiosPower-supply and output-stage components were replaced as documentedAmplifier, tuner, controls, inputs, outputs, and speaker operation were testedBacked by our 1-Year HQaudios Warranty2/ Sound CharacterThe Pioneer SX-850 delivers the balanced, substantial presentation associated with Pioneer's classic 1970s receivers. Its amplifier section provides strong drive and a confident sense of dynamics, while the preamplifier and tone-control architecture allows the listener to fine-tune the presentation for different recordings and speaker systems.The overall character is clean, articulate, and controlled, with good weight through the lower frequencies, a clear and natural midrange, and an open upper range. The SX-850 works particularly well with efficient vintage speakers and classic bookshelf or floorstanding designs where its power delivery and tonal character can be appreciated.It is a versatile choice for vinyl, FM listening, tape sources, and complete vintage systems, particularly for listeners who enjoy the tactile controls, large analog-style tuning display, and musical presentation of classic Pioneer equipment.3/ Cosmetic ConditionThis unit is in Excellent vintage cosmetic condition with light signs of age and previous use consistent with a vintage Pioneer receiver.Please review all photos carefully, as they are part of the description.Faceplate / Front Baffle: Clean overall vintage Pioneer faceplate with the original layout, lettering, controls, and large tuning display retained.Knobs / Controls / Switches: Original controls and switches are present and maintain the classic SX-850 appearance.Chassis / Housing: The receiver chassis and exterior housing present in excellent overall cosmetic condition with light signs of age and previous use.Dial Glass / Meters / Lamps: Large original dial glass and dual tuning meters are present and visually well preserved.Rear Panel / Connections: Rear-panel condition is not fully visible in the provided photos; please review all available images carefully before purchase.4/ HQaudios Restoration & Testing ProcessBefore RestorationThe Pioneer SX-850 was carefully inspected upon arrival to evaluate its overall mechanical, electrical, operational, and cosmetic condition.Particular attention was given to the power supply, amplifier stages, protection circuitry, preamplifier section, AM/FM tuner section, controls, switches, speaker terminals, RCA connections, internal wiring, meters, and illumination.The inspection results were used to determine the service work required for this specific unit.During RestorationBased on the inspection results, this unit was restored according to HQaudios' technical standards while preserving the original engineering and operating characteristics of the SX-850.The power supply, amplifier circuitry, protection system, controls, switches, connectors, tuner section, and signal path were inspected and serviced as documented.Documented service work included replacement of specified power-supply capacitors and documented output-stage transistors.After the technical restoration was completed, the exterior was professionally cleaned and detailed while preserving the authentic vintage character of the Pioneer SX-850.After RestorationOnce restoration was completed, this unit underwent comprehensive functional testing under real operating conditions.Amplifier performance, channel balance, output operation, tuner reception, inputs, outputs, speaker outputs, controls, switches, meters, and illumination were tested.Finally, the unit underwent extended real-world listening tests to evaluate sound quality, operational stability, and overall performance.Only after successfully meeting HQaudios' restoration and testing standards was the Pioneer SX-850 approved and prepared for its next owner.5/ Amplifier, Tuner & ControlsThe Pioneer SX-850 combines a substantial stereo amplifier section with a dedicated AM/FM tuner, extensive source connectivity, two-system speaker drive, and separable preamplifier / power amplifier operation.The amplifier section, tuner circuitry, input and output sections, speaker switching, front-panel controls, tuning meters, and illumination are central to the SX-850's operation and were given particular attention throughout HQaudios' restoration and testing process.Additional close-up photos or videos are available upon request.6/ SpecificationsBrand: PioneerModel: SX-850Type: Stereo AM/FM ReceiverPower Output: 65 Watts per channel into 8 ohms; 85 Watts per channel into 4 ohmsFrequency Response: 10Hz–50kHzInputs: Phono 1, Phono 2, Microphone, AUX, Tape Play 1, Tape Play 2, Tape Play 2 DIN, Dolby NR Adapter, Power Amp InBuilt-In Tuner: FM / MW (AM)Speaker Outputs: Speaker A, Speaker B, A+B; 4 Ohms minimum speaker loadSpecial Features: Two-system speaker drive, separable pre/main operation, super-quiet phono equalizer, FET tone control, 2-step bass and treble turnover, 2-deck monitor/dubbing, dual tuning metersDimensions: Approx. 20.73 W × 6.81 H × 16.20 D in (526.6 × 173 × 411.5 mm)Weight: Approx. 42.1 lbs / 19.1 kgCondition: Professionally Restored / Serviced / TestedWarranty: 1-Year HQaudios Warranty7/ What Is IncludedIncluded: 1 Pioneer SX-850 Stereo Receiver as shown in the listing photographs.8/ Video Test & Sound DemoWe understand that purchasing vintage audio equipment online requires confidence.If you would like to see or hear this Pioneer SX-850 in operation before purchasing, please contact us directly. We are happy to provide additional photos, close-up images, operational videos, or sound demonstrations upon request.You are also welcome to visit the HQaudios YouTube channel to explore restoration projects, product demonstrations, and listening sessions featuring professionally restored vintage audio equipment.9/ Suggested PairingThe Pioneer SX-850 pairs especially well with efficient vintage speakers and classic source components that complement its 4-ohm minimum speaker-load capability, power delivery, and classic Pioneer tonal character.System #1 – Pioneer HPM-100Pioneer HPM-100 + Pioneer SX-850Result: A natural all-Pioneer vintage system with strong dynamics, good efficiency, and a classic 1970s presentation suited to rock, jazz, funk, and vinyl listening.System #2 – JBL L100 CenturyJBL L100 Century + Pioneer SX-850Result: The L100's efficient 8-ohm design makes it a strong match for the SX-850, providing a lively presentation with solid bass weight and energetic dynamics.System #3 – Technics SL-1200MK2Technics SL-1200MK2 + Pioneer SX-850 + Pioneer HPM-100Result: A classic vinyl-focused combination that pairs a direct-drive turntable with the SX-850's phono stage and a compatible vintage speaker system.For the best performance, ensure that all connected equipment is electrically and mechanically compatible with the Pioneer SX-850 and properly configured before use.10/ Basic Use GuideTo help maintain the long-term performance of this stereo receiver, we recommend the following:Use speakers with an appropriate impedance and follow the receiver's speaker-load requirements for the selected A, B, or A+B configuration.Verify speaker wiring and polarity before powering on.Maintain adequate ventilation around the receiver and do not block the ventilation openings.Avoid sustained amplifier clipping or excessive volume levels.Confirm the receiver's voltage configuration before use.Please contact us if you need assistance with setup, operation, amplifier matching, speaker connection, or system configuration.11/ Trade-In ProgramDo you have vintage audio equipment you'd like to trade in?HQaudios welcomes trade-ins on receivers, amplifiers, speakers, cassette decks, reel-to-reel decks, turntables, and other classic audio components.Simply send us photos and basic information about your equipment. Our team will review your items and discuss available trade-in options.12/ Build Your Vintage SystemLooking to build a complete vintage audio system?The Pioneer SX-850 pairs beautifully with professionally restored vintage speakers, turntables, and other components available from HQaudios.Save $100 when purchasing this item together with a qualifying pair of speakers or another restored vintage audio component from HQaudios.Please contact us before purchase so we can confirm availability and prepare a combined offer.13/ Shipping & PackagingVintage audio equipment is heavy and delicate and requires careful packing. This unit will be professionally packed by HQaudios for safe delivery.Carefully wrapped and protected.Heavy-duty protective packing materials used.Extra protection around the faceplate, knobs, chassis corners, and rear connections.Tracking information provided after shipment.Signature may be required for delivery.Local pickup may also be available by appointment.14/ 1-Year HQaudios WarrantyThis item is backed by our 1-Year HQaudios Warranty, covering proper electronic and functional operation under normal home use.If you experience an issue, please contact us first. We are committed to helping our customers and will work with you to resolve the problem in a fair and reasonable way.The warranty does not cover misuse, improper setup, unauthorized repair, physical damage, cosmetic wear, amplifier clipping, incorrect wiring, incompatible equipment, operation outside the manufacturer's intended specifications, or shipping damage identified after delivery.15/ Customer ServiceOnce your item arrives, if you have questions about setup, speaker connection, turntable connection, switch settings, amplifier matching, or general operation, please contact us.We are happy to help you get the best performance from your vintage audio system.16/ Important Note for BuyersVintage audio equipment requires proper setup, compatible supporting equipment, careful handling, and appropriate maintenance.We do our best to describe each item clearly and provide detailed photos so you can buy with confidence.Please review all photos, read the full description, and contact us with any questions before purchase.Always verify model-specific requirements such as speaker impedance, amplifier compatibility, voltage configuration, wiring, and other requirements before operation.HQaudios – Vintage Audio Restored with Care.Professionally Restored • Fully Tested • Carefully Packed • 1-Year Warranty
Price$2,499
Free Shipping
Free Shipping
from Garden Grove, CA
30-Day Return Policy
Enjoy peace of mind with your new gear
