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.

  • 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.

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 meticulously restored by HQaudios to ensure it operates at peak performance. While keeping its vintage character intact, this receiver has been serviced and upgraded with precision to provide reliable audio quality and an enhanced visual appeal.

Fully Serviced

  • Brushed aluminum faceplate cleaned and polished to restore its shine

  • Knobs, switches, and pushbuttons cleaned and lubricated for smooth, noise-free operation

  • Tone controls (bass, treble, balance) calibrated to factory specifications

  • Speaker terminals cleaned and retensioned for secure connection

  • Headphone output tested for full, clear stereo output

  • RCA inputs cleaned and re-tensioned for optimal signal integrity

  • Internal chassis cleaned, dusted, and detailed

Electronic Restoration

  • Capacitors replaced across the power supply, preamplifier, tone control, and power amplifier sections

  • Power rails tested and regulated for stable output

  • DC offset and bias recalibrated to factory specifications

  • Transistors tested and replaced where necessary with low-noise equivalents

  • Solder joints reflowed in heat-sensitive areas to ensure long-term reliability

Signal Path & Connectivity

  • RCA jacks and speaker terminals cleaned and secured

  • Phono stage tested for correct gain and low noise performance

  • Headphone output tested for balanced, distortion-free performance

Tuner & Meter System

  • FM/AM tuner fully aligned for stable reception

  • Signal strength and tuning meters calibrated for accurate readings

  • Dial and meter illumination restored for uniform brightness
Final Testing & Quality Control

  • Extended burn-in period with real-world listening tests

  • All inputs, outputs, and functions tested for full functionality

  • Channel balance, dynamics, and thermal stability verified

RESULT

The Pioneer SX-680 now offers clear, powerful audio performance with a smooth, distortion-free sound profile. Its vintage design has been carefully preserved, with a slight patina that adds to its character. This receiver is fully functional and has been restored to look and sound as good as it did when it was first released. It's an ideal addition to any vintage audio setup, providing decades of high-quality listening enjoyment.

  • 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

🎁 Unlock an instant $100 voucher with every combo purchase.

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

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)

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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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.

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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.
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From HQaudios Team!