Marantz 4240 Vintage Stereo Receiver

The Marantz 4240 is a highly versatile Stereo 2 / Quadradial 4-channel receiver from Marantz’s golden era, designed to bridge the transition between traditional stereo and immersive quadraphonic sound. Combining classic Marantz warmth with advanced quadraphonic flexibility, the 4240 is a true multi-format receiver that appeals to both collectors and serious vintage audio enthusiasts.

Visually, the 4240 is unmistakably Marantz—featuring the iconic brushed silver aluminum faceplate, deep blue dial and meter illumination, and a perfectly balanced control layout. Sonically, it delivers smooth, musical stereo playback while offering true four-channel capability for quadraphonic sources, making it one of the most flexible receivers of its era.

This unit has been professionally serviced by HQaudios, ensuring stable operation, accurate channel balance, and long-term reliability while preserving its original vintage character and collectible value.

Condition: Excellent – Serviced, tested, and cleaned

Model: Marantz 4240

Type: Stereo / Quadradial 4-Channel Receiver

Protection Plan: 1-Year Warranty Included

Free Support: Must be used before requesting return

Packaging: Securely packed, insured, and tracked

ACCESSORIES: Wood case

SKU: 15JKE4554

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: 40W/ch (stereo), 17W/ch into 4Ω (quadraphonic)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.5%

Damping factor: 20

Input sensitivity: 2.2mV (MM), 150mV (line)

Signal to noise ratio: 93dB (MM)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 17.32 × 5.39 × 14.37 inches

Weight: 34.17 lbs

KEY FEATURES

Stereo 2 / Quadradial 4 Operation: Seamless switching between stereo and quadraphonic modes

Power Output: Clean, balanced amplification for both 2-channel and 4-channel systems

Dolby System: Built-in Dolby processing for quad and tape playback

Blue Dial & Meter Illumination: Classic Marantz aesthetic with excellent visibility

Gyro-Touch Tuning: Smooth and precise FM/AM tuning control

Independent Front & Rear Controls: Balance, bass, treble, and dimension adjustment

Multiple Inputs: Phono, AUX, Tape, and quad-compatible sources

Dual Headphone Outputs: Front and rear headphone monitoring

Heavy-Duty Construction: Oversized power supply and solid chassis design

REFURBISHED

This Marantz 4240 has undergone a comprehensive professional servicing process by HQaudios to restore performance, stability, and operational accuracy while preserving its original appearance.

1. Fully Serviced

• Brushed aluminum faceplate carefully cleaned and detailed; original lettering preserved
• All knobs, switches, and sliders cleaned with DeoxIT and lubricated for smooth, noise-free operation
• Dolby controls, mode selector, and dimension controls tested and calibrated
• Input/output terminals cleaned and re-tensioned
• Front and rear headphone outputs tested for clean, balanced playback
• Internal chassis cleaned and dusted
• Rear panel cleaned with markings preserved

2. Electronic Inspection & Restoration

• Power supply inspected and stabilized for consistent voltage delivery
• Aging or out-of-spec components replaced where necessary
• Channel balance and DC offset checked and adjusted
• Heat-stressed solder joints reflowed for long-term reliability

3. Tuner & Display System

• FM/AM tuner tested for sensitivity and stable reception
• Gyro-touch tuning mechanism cleaned and adjusted
• Dial illumination verified for even blue glow across the scale

4. Meter & Control System

• Signal strength and tuning meters tested for accurate response
• All front/rear controls verified for smooth and precise operation

5. Final Testing & Quality Control

• Extended stereo and quadraphonic operation testing
• All inputs and outputs tested for noise-free signal
• Channel balance verified across all four channels
• Final listening tests performed to confirm smooth, musical playback

Result:
The Marantz 4240 now delivers classic Marantz warmth in stereo mode and immersive quadraphonic performance when required—paired with a beautifully preserved silver-face appearance and iconic blue illumination. A rare and highly flexible receiver, ready for years of reliable listening enjoyment.

SUGGESTED PAIRINGS

• Speakers: Four matched vintage speakers (JBL, Advent, KLH, AR) for quad setups
• Stereo Systems: Use as a high-quality stereo receiver with modern or vintage speakers
• Sources: Quadraphonic reel-to-reel decks, turntables with quad cartridges, vintage quad decoders
• Accessories: Original-style walnut wood case (optional) to complete the classic Marantz look

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

PACKAGING & SHIPPING

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.