The Pioneer SX-680 is a classic vintage stereo receiver that brings together exceptional sound quality, timeless design, and robust functionality. Released in the 1970s, this receiver offers powerful performance, making it a popular choice for audiophiles and collectors alike. It features a distinctive brushed aluminum faceplate, wood veneer side panels, and high-quality internals that ensure clear, reliable sound.
Now, this Pioneer SX-680 has undergone full professional servicing, testing, and restoration to restore its original performance and aesthetic appeal. It is ready to deliver the signature Pioneer sound while remaining a solid addition to your vintage audio collection.
Some of the knobs show minor oxidation. We have done our best to clean and treat them; however, a few marks may still remain. We kindly ask that you review this information carefully to fully understand the condition of the item before purchasing.
Model: Pioneer SX-680
Type: 2-Channel Stereo Receiver
Protection Plan: 1-Year Warranty Included
Free Support: Must be used before requesting return
Accessories: Walnut Wood case
SKU: 151THSH0035
Customer Service:
Once your item arrives, if you have questions about how your item functions or proper settings, please CONTACT US.
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“If you have any vintage audios (receivers, speakers, cassette, reel to reel...) & want to upgrade with the serviced one, don't hesitate to contact us for the best deal. You only need to pay for the difference between yours & mine....”
Note:
The actual color of the product may sometimes differ slightly from the photos due to lighting conditions, temperature, and the device used. Some angles in the photos may not fully reflect the product’s condition. Please read the description carefully and feel free to message us if you have any questions.
Model: Pioneer SX-680
Type: 2-Channel Stereo Receiver
Protection Plan: 1-Year Warranty Included
Free Support: Must be used before requesting return
Accessories: Walnut Wood case
SKU: 151THSH0035
Tuning range: FM, MW
Power output: 30 watts per channel into 8Ω (stereo)
Frequency response: 5Hz to 100kHz
Total harmonic distortion: 0.1%
Damping factor: 25
Input sensitivity: 2.5mV (MM), 150mV (line)
Signal to noise ratio: 75dB (MM), 90dB (line)
Output: 150mV (line)
Speaker load impedance: 4Ω (minimum)
Dimensions: 17.13 x 5.69 x 12.36 inches
Weight: 19.62 lbs
- Power Output: 30 watts per channel at 8 ohms
- Tone Controls: Bass, Treble, Balance, Loudness for easy sound adjustments
- Tuning: AM/FM stereo tuner with clear signal strength meters
- Connectivity: Phono, Tape, and AUX inputs for versatile audio sources
- Design: Brushed aluminum faceplate with walnut wood veneer side panels
- Durability: Built with quality materials to last through the years
- Speaker Options: A and B speaker connections for flexible setup
This Pioneer SX-680 has been professionally restored by HQaudios to ensure reliable performance, long-term stability, and preserved vintage aesthetics. While maintaining its original character, this unit has undergone detailed servicing and precision calibration to deliver clean, stable, and musical sound.
Fully Serviced
Brushed and anode black aluminum faceplate carefully cleaned and polished while preserving original lettering
All knobs, switches, and pushbuttons removed, cleaned with contact cleaner, and lubricated for smooth, noise-free operation
Bass, treble, balance, and loudness controls tested and recalibrated for accurate response
Speaker terminals cleaned and re-tensioned to ensure solid and secure connections
Headphone output tested for clear, full stereo performance
RCA inputs cleaned and tightened for optimal signal transfer
Internal chassis fully dusted and detailed to improve airflow and long-term reliability
Brushed and anode black aluminum faceplate carefully cleaned and polished while preserving original lettering
All knobs, switches, and pushbuttons removed, cleaned with contact cleaner, and lubricated for smooth, noise-free operation
Bass, treble, balance, and loudness controls tested and recalibrated for accurate response
Speaker terminals cleaned and re-tensioned to ensure solid and secure connections
Headphone output tested for clear, full stereo performance
RCA inputs cleaned and tightened for optimal signal transfer
Internal chassis fully dusted and detailed to improve airflow and long-term reliability
Electronic Restoration
Capacitors replaced where necessary in the power supply, tone control, preamp, and power amplifier sections
Power rails inspected and stabilized to ensure consistent voltage delivery
DC offset and bias precisely adjusted to factory-safe operating specifications
Output transistors tested and replaced where required with reliable low-noise equivalents
Heat-stressed solder joints inspected and reflowed to reinforce long-term durability
Capacitors replaced where necessary in the power supply, tone control, preamp, and power amplifier sections
Power rails inspected and stabilized to ensure consistent voltage delivery
DC offset and bias precisely adjusted to factory-safe operating specifications
Output transistors tested and replaced where required with reliable low-noise equivalents
Heat-stressed solder joints inspected and reflowed to reinforce long-term durability
Signal Path & Connectivity
Signal path inspected and optimized for clean, low-noise performance
Phono stage tested for proper gain structure and minimal background noise
AUX and Tape Monitor inputs verified for stable, distortion-free playback
Channel balance confirmed for symmetrical stereo imaging
Signal path inspected and optimized for clean, low-noise performance
Phono stage tested for proper gain structure and minimal background noise
AUX and Tape Monitor inputs verified for stable, distortion-free playback
Channel balance confirmed for symmetrical stereo imaging
Tuner & Meter System
FM/AM tuner section tested for stable reception and stereo lock performance
Tuning indicator and signal strength meters verified for accurate operation
Dial illumination restored for even brightness and classic visual presentation
FM/AM tuner section tested for stable reception and stereo lock performance
Tuning indicator and signal strength meters verified for accurate operation
Dial illumination restored for even brightness and classic visual presentation
Final Testing & Quality Control
Extended burn-in testing performed under load to confirm thermal stability
All functions, switches, and inputs verified for full operational integrity
Listening tests conducted to evaluate clarity, dynamics, channel balance, and tonal accuracy
Unit monitored for noise floor consistency and distortion-free output
Extended burn-in testing performed under load to confirm thermal stability
All functions, switches, and inputs verified for full operational integrity
Listening tests conducted to evaluate clarity, dynamics, channel balance, and tonal accuracy
Unit monitored for noise floor consistency and distortion-free output
RESULT
The Pioneer SX-680 now delivers the smooth, warm, and dynamic Pioneer sound it is known for. With stable output, clean stereo imaging, and reliable performance, this receiver is ready for daily listening or integration into a vintage hi-fi system. Its classic silver face, black control panel, and wood cabinet remain visually timeless while offering dependable performance for years to come.
Speakers: JBL L26, KLH Model 17, Pioneer HPM-60
Turntables: Technics SL-1200, Dual 1219, Thorens TD-160
Cassette Decks: Pioneer CT-F900, TEAC A-2300, Akai GX-747
Speakers: JBL L26, KLH Model 17, Pioneer HPM-60
Turntables: Technics SL-1200, Dual 1219, Thorens TD-160
Cassette Decks: Pioneer CT-F900, TEAC A-2300, Akai GX-747
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Secure Packaging:
High-density foam inserts with 5-layer corrugated cartons
Additional internal padding and wrap for transit protection
Double-wall outer box with corner guards and straps
High-density foam inserts with 5-layer corrugated cartons
Additional internal padding and wrap for transit protection
Double-wall outer box with corner guards and straps
Shipping Details:
Dispatch Time: Ships within 3 business days
Carrier: UPS Ground (tracked & insured)
Signature Required: Yes (as buyer's request)
Transit Time: Typically 3–7 business days (USA)
Dispatch Time: Ships within 3 business days
Carrier: UPS Ground (tracked & insured)
Signature Required: Yes (as buyer's request)
Transit Time: Typically 3–7 business days (USA)
International Shipping:
We offer global delivery through the eBay International Shipping Program. eBay handles customs, duties, and tracking.
📦 Note: Packaging may vary slightly depending on unit size or availability, but safety and protection are always our top priority.
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HQaudios
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BY BUYING FROM HQaudios YOU AGREE TO CONTACT US DIRECTLY BEFORE LEAVING LESS THAN POSITIVE FEEDBACK, ANY RATING LESS THAN 5, OR STARTING A RETURN!
All items will be shipped within 03 business days of payment being processed!
Shipping Policy: This is for local pickup or we will ship it very carefully so that it arrives in good shape like it is now.
We provide shipping to the contiguous 48 United States, on most items. Shipping fees to ALL OTHER LOCATIONS will be calculated individually and added to customer invoices. HQaudios is also not responsible for any taxes, local duties, or fees outside of the USA and those are not included in the sale price or ship charge. In the event that the customer refuses a shipment, all shipping costs to and from the country or State in which the item was shipped to are not refunded. Please note, in some cases return shipping can cost as much as double the original ship cost.
All shipments are processed within 03 business days of payment, whenever possible. In the event of stock issues causing a delay, customers will be promptly notified, and alternative shipment arrangements will be made. Customers are responsible for any charges incurred due to failed delivery attempts or re-delivery.
Our customers' satisfaction means everything to us. Once you get this item, feel free to contact us if it has any problems! I will try to answer any questions that you may have in a timely fashion.
Return Policy: FREE SUPPORT SERVICE MUST BE UTILIZED BEFORE REQUESTING ANY RETURN, FOR ANY REASON. Items may be exchanged within 30 days if defective or not as described, with a full refund of the purchase price if an exchange is unavailable. If due to seller error, we will issue a prepaid return label or arrange for reimbursement of return shipping expenses as per this policy, not exceeding the original shipping cost. The address for returning shipment: 10851 Capital Ave, Garden Grove CA 92843 Returned items may require inspection before determining fault. The item must be received in its original, unaltered condition with all original packaging. Electronic items cannot be opened or tampered with; sealed items must remain sealed, and "Excellent" items must remain in "Excellent" condition. No returns will be accepted without first contacting us for Free Support, troubleshooting, or evaluation.
Warranty Policy: The warranty covers technical parts for up to 12 months from the date of receipt, provided there is valid evidence and the item remains sealed, unaltered, and has not been disassembled or internally inspected/repaired. Please note that shipping costs for warranty service will be the seller's responsibility if the item is found to be defective.
⚠ Important Notice: To ensure a smooth warranty process, we kindly request that you record a video while unboxing your package upon delivery. Any claims related to product damage or warranty service must be supported by clear video and photographic evidence. Please submit all required documentation to the official HQaudios email for prompt assistance.
***Failure to provide sufficient information as per our guidelines may result in the rejection of your request
⚠ For high-value products: Due to the nature of these products, we prioritize fast processing for orders from eBay account holders who have been established for at least 3 years, with a successful transaction rate and feedback score of 99% or higher. For other cases, we will carefully consider the order and proactively contact the buyer to provide prompt support.
For full policy details, please visit our ABOUT US page.
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From HQaudios Team!