Vintage Concept 16.5 Monster Stereo Receiver

Concept 16.5 – one of the rare survivors from the golden age of American hi-fi in the 1970s. When it was first introduced, it wasn’t just an audio component; it was a statement of power and engineering excellence – something that is rarely built the same way today.

Over time, many Concept 16.5 units have disappeared, worn down, or lost their original performance. That’s what makes every remaining piece today – especially one that has been properly restored – highly collectible. From its classic wood cabinet to its bold, commanding faceplate, every detail reflects an era when audio gear was designed not only to perform, but to be admired and lived with.

But the true value of the Concept 16.5 goes beyond rarity – it lies in the experience. Once powered on, its sound still holds its ground against many modern systems: powerful, clean, full-bodied, yet warm and deeply analog in character. Whether you’re rediscovering vinyl or building a serious hi-fi setup, this receiver has the ability to transform how you connect with music.

Understanding the risks that often come with vintage equipment, HQAudios doesn’t simply resell – we restore. This Concept 16.5 has undergone a comprehensive restoration process by our technicians, with critical components replaced using high-quality parts to ensure reliable performance and to bring the unit back to its intended sonic character.

⚠️ Important Note – Vintage Market Risks

When purchasing vintage audio equipment over 50 years old, actual condition is far more important than the model itself. On the general market, many units may suffer from aging components, inconsistent restoration quality, or altered sound performance due to improper servicing.

At HQaudios, every unit is carefully restored, tested, and verified using a structured technical process to ensure stable performance and preserve the original sound signature. This provides a significantly safer and more reliable buying experience compared to unverified vintage listings.

Note: This item is designed for the U.S. market and operates on U.S. power standards. If you are located outside the United States, please contact us before purchasing so we can help confirm compatibility for your setup.

• CONDITION: Excellent – Fully Serviced & Tested
• MODEL: Concept 16.5
• TYPE: Stereo Receiver
• PROTECTION PLAN: 1-Year Warranty Included
• FREE SUPPORT: Must be used before requesting return
• ACCESSORIES: Walnut Wood case
• SKU: 15DQE1659

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.

2. SPECS

• Tuning range: FM, MW
• Power output: 165 watts per channel into 8Ω (stereo)
• Frequency response: 20Hz to 20kHz
• Total harmonic distortion: 0.1%
• Damping factor: 450
• Input sensitivity: 1.9mV (MM), 160mV (line)
• Signal to noise ratio: 78dB (MM), 85dB (line)
• Output: 600mV (line)
• Weight: 67.24 lbs

3. KEY FEATURES

• High-power output for an immersive audio experience
• Dual power meters for easy monitoring of signal levels
• Classic analog sound with clean, detailed midrange and dynamic bass
• Sleek wood cabinet and bold front panel for a timeless look
• Fully serviced for long-term reliability and high-quality performance

4. REFURBISHED

The Concept 16.5 has undergone a comprehensive restoration by the expert technicians at HQaudios, ensuring that it performs like new while preserving its classic aesthetic.

1. Fully Serviced

• Faceplate and knobs cleaned and polished to restore original brilliance
• All switches and potentiometers cleaned with DeoxIT to eliminate noise and ensure smooth operation
• Tone controls (bass, mid, treble) tested and calibrated for accurate response
• Input/output connections inspected and cleaned for stable signal transfer
• Dial lamps and internal lighting replaced for consistent illumination and long-term reliability
• Custom anodized in black
• Laser-engraved lettering

2. Electronic Restoration

• Amplifier section tested to guarantee consistent, distortion-free output
• Bias and DC offset adjusted to optimal levels for safe operation
• Signal path cleaned and optimized to reduce noise and improve clarity

3. Tuner Calibration

• FM/AM tuner tested and fine-tuned for clear, stable reception
• Dial tracking calibrated for precise station tuning
• Signal meters and lighting tested for perfect operation

4. Final Testing & Quality Assurance

• Inputs (Phono, AUX, Tape) tested for clean, noise-free performance
• Stereo balance and imaging verified for an accurate soundstage
• Listening tests conducted to confirm a rich, dynamic sound
• Thermal stability checked to ensure long-lasting reliability

RESULT

After a complete restoration, the Concept 16.5 has been brought back to its original performance standard — delivering a warm, detailed sound signature that continues to stand the test of time. The amplifier outputs strong, clean power with excellent clarity, while the tuner locks onto FM/AM signals smoothly and reliably.

Visually, the unit presents beautifully, with a refreshed exterior, a pristine faceplate, newly replaced illumination, and refined detailing that preserves its iconic vintage character.

With its expertly restored performance, the Concept 16.5 is ready to provide years of dependable listening. Trust HQaudios to bring this vintage gem back to life, ensuring it continues to offer exceptional performance for years to come.

5. SUGGESTED PAIRINGS

• Klipsch Heresy / Forte – for a lively and detailed sound
• JBL L100 / 4311 – for powerful bass and punchy dynamics
• Wharfedale / KEF – for a balanced and smooth listening experience

Pair it with the right system—and experience why Marantz remains one of the most beloved names in vintage audio.

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

6. 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.

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Thank you for viewing our listing! Please kindly ensure you read all the provided information carefully!

We strive to describe all items honestly and accurately. However, as human beings, we may occasionally make mistakes. If you have any doubts or encounter conflicting information, please inquire before purchasing or making an offer.

We kindly request that all buyers give us the opportunity to address any issues.

Payment Policy:

All buyers are required to make immediate payment or contact us within 24 hours to arrange payment, with payment received within 3 days. Offers submitted under the Best Offer feature are considered binding agreements and require immediate payment upon acceptance. Failure to adhere to these terms may result in substitution or cancellation of the transaction.

Payments must be accompanied by a valid shipping address listed as Confirmed. Payments with invalid shipping addresses will be refunded and may incur a processing fee deducted from the refund amount.

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. 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.

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.

Return Policy:

Our 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 “Mint” items must remain in “Mint” 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.

If you have any issues or dissatisfaction with our services, products, or policies, please refrain from leaving negative feedback immediately. Instead, contact us right away so we can provide you with the best possible solution and have the opportunity to improve our service quality!

Thank you for being a valued customer & Thanks for looking!