Pioneer SX780 Vintage Receiver

ABOUT

The Pioneer SX-780 stands as one of the most well-balanced stereo receivers of its era, combining solid engineering, elegant design, and dependable performance. Featuring a brushed aluminum front panel, classic wooden side panels, and a clean, symmetrical control layout, the SX-780 embodies the timeless Pioneer aesthetic that continues to attract audiophiles and vintage audio enthusiasts.

This unit has been professionally restored by HQaudios, returning the receiver to its intended sonic character while improving long-term reliability. Through careful servicing and technical upgrades, the SX-780 once again delivers the clear, engaging Pioneer sound it is known for—making it an excellent choice for both daily listening and serious vintage collections.

CONDITION: Excellent – Serviced, tested, and cleaned

MODEL: Pioneer SX780

TYPE: 2-Channel Stereo Receiver

PROTECTION PLAN: 1-Year Warranty Included

FREE SUPPORT: Must be used before requesting return

SKU: 15JKE4534

Customer Service:

Once your item arrives, if you have questions about how your item functions or proper settings, please CONTACT US.

TRADE-IN PROGRAM

“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

SPECS

Tuning range: FM, MW

Power output: 45 watts per channel into 8Ω (stereo)

Frequency response: 5Hz to 80kHz

Total harmonic distortion: 0.05%

Damping factor: 30

Input sensitivity: 2.5mV (MM), 150mV (line)

Signal to noise ratio: 76dB (MM), 95dB (line)

Output: 150mV (line)

Speaker load impedance: 4Ω (minimum)

Semiconductors: 5 x FWT, 11 x IC, 26 x transistors, 22 x diodes

Dimensions: 18.9 x 5.51 x 12.6 inches

Weight: 24.69 lbs

KEY FEATURES

Power Output: 45 watts per channel into 8 ohms

Aesthetic Design: Classic brushed aluminum faceplate with sleek wood side panels

Tone Controls: Bass, Treble, Balance, Loudness for precise sound customization

Tuning: Clear, reliable AM/FM stereo tuning with signal strength meters

Connectivity: Phono, Tape, and AUX inputs for versatile usage

Durability: Heavy-duty construction designed to last

Speaker Options: A and B speaker connections for flexible setup

REFURBISHED

This Pioneer SX-780 has received a full professional refurbishment, addressing both mechanical and electronic aging to ensure stable operation, accurate sound reproduction, and a clean vintage presentation. Every critical system has been inspected, serviced, and verified according to HQaudios standards.

1. General Service & Mechanical Restoration

• Aluminum faceplate thoroughly cleaned and hand-polished
• All knobs, switches, and pushbuttons cleaned, lubricated, and tested for smooth, precise operation
• Tone control circuits (bass, treble, balance, loudness) checked and adjusted for proper response
• Speaker terminals cleaned and re-tensioned to ensure secure output connection
• Headphone output tested for clear, full-range stereo playback
• RCA input jacks cleaned and conditioned for consistent signal contact
• Internal chassis fully cleaned and dusted for proper airflow and presentation
• Rear panel cleaned with labeling preserved and refreshed where required
  

2. Electronic Restoration & Calibration

• Capacitors replaced throughout the power supply, preamp, tone, phono, and amplifier sections
• Power supply rails tested and stabilized to ensure consistent voltage delivery
• DC offset and bias adjusted to original factory specifications
• Key transistors tested and replaced where necessary with modern low-noise equivalents
• Heat-stressed solder joints reflowed to improve long-term reliability
• Wood cabinet refinished with a high-quality walnut finish to restore its original appearance

3. Tuner Performance Restoration

• FM and AM tuner circuits fully aligned using precision calibration equipment
• Stereo lock sensitivity and muting thresholds adjusted for clean FM decoding
• Gyro-tuning mechanism cleaned and serviced for smooth, accurate tuning feel
• Dial pointer repositioned and tracking calibrated for accurate frequency indication
  

4. Final Testing & QA

• Receiver operated under continuous load for 2 hours to confirm thermal stability
• Channel balance, noise floor, and output consistency verified
• All inputs (Phono, AUX, Tape) tested for clean signal handling
• Extended listening tests performed to evaluate tonal balance, dynamics, and clarity
• Final inspection completed under HQaudios Quality Control standards
  

5. Result

After restoration, the Pioneer SX-780 delivers a warm yet articulate sound signature, with excellent channel balance, low noise, and smooth control operation. Combined with its classic design and proven reliability, this receiver is once again ready to serve as the centerpiece of a high-quality vintage audio system—faithfully restored to provide many years of enjoyable listening.

SUGGESTED PAIRINGS

Speakers: JBL L100, Klipsch Forte, Pioneer HPM-100

Turntables: Technics SL-1200, Marantz 6100, Dual 1229

Cassette Decks: Pioneer CT-F900, TEAC A-450

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

PACKAGING & SHIPPING:

Secure Packaging:
Each unit is carefully packed using:

• High-density foam inserts with 5-layer corrugated cartons
• Custom EPE foam corners to protect edges
• Double-wall outer box for shock resistance
• Plastic straps + handling labels to ensure safe transit

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 model, but safety and protection are always our top priority.