KLH Fifty-One Vintage Receiver

The KLH Model Fifty-One is a refined American stereo receiver from the golden era of hi-fi, designed with a clear focus on musical balance, reliability, and understated elegance. Unlike many power-driven competitors of its time, the Fifty-One emphasizes natural tonality, smooth midrange response, and long-term listening comfort—qualities that have earned KLH a loyal following among vintage audio enthusiasts.

With its clean silver faceplate, intuitive control layout, and solid internal construction, the Fifty-One integrates seamlessly into both classic and modern vintage systems. This unit has been professionally serviced and comprehensively restored by HQaudios, ensuring stable operation, clean signal flow, and dependable daily use—while preserving the receiver’s original sonic character and vintage charm.

Condition: Excellent – fully serviced, restored, tested, and cleaned

Model: KLH Fifty-One

Type: 2-Channel Stereo Receiver

Protection Plan: 1-Year Warranty Included

Free Support: Must be used before requesting return

Packaging: Securely packed, insured, and tracked

Accessories: Walnut Wood case

SKU: 15TTE0265

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: 20 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 35kHz

Total harmonic distortion: 0.5%

Damping factor: 20

Input sensitivity: 2.5mV (MM), 170mV (line)

Signal to noise ratio: 63dB (MM), 170dB (ceramic), 70dB (line)

Speaker load impedance: 4Ω (minimum)

Dimensions: 6-3/16 x 16-15/16 x 12-5/8 inches

Weight: 21.5lbs

Year: 1971

KEY FEATURES

Smooth, Musical American Sound Signature – Natural midrange with relaxed highs

Classic Silver-Face Design – Clean, minimalist front panel with solid aluminum controls

AM/FM Analog Tuner – Stable reception with clear dial visibility

Phono Input – Designed for vintage turntables and analog sources

Tone Controls – Bass, treble, balance, and contour for subtle sound shaping

Headphone Output – Clean, low-noise private listening

Solid Build Quality – Designed for longevity and reliable everyday use

REFURBISHED

This **KLH Fifty-One receiver has undergone a full professional refurbishment following HQaudios’ standard restoration process, with the goal of restoring original performance, operational stability, and long-term reliability—without altering the unit’s authentic vintage character.

Professionally Serviced

• Front aluminum faceplate carefully cleaned and polished; original lettering fully preserved
• All knobs and switches ultrasonically cleaned and detailed for smooth, precise operation
• Internal chassis thoroughly cleaned; dust and oxidation removed
• Rear panel cleaned; speaker terminals and RCA jacks serviced and re-tensioned
• Headphone output tested for clean, balanced stereo signal

Electrical Restoration

• Power supply inspected and stabilized to ensure consistent voltage delivery
• Aged electrolytic capacitors in critical signal and power sections replaced as required
• DC offset and bias checked and adjusted to factory-safe operating range
• Signal path inspected for noise, drift, or imbalance and corrected where necessary
• All solder joints inspected; weak or heat-stressed joints reflowed
• Replacing the 8V radio tube makes the sound quality level more apparent.

Control & Signal Path Service

• Bass, treble, balance, contour, and volume controls cleaned and calibrated
• Selector switches serviced to eliminate dropouts or channel imbalance
• Phono stage tested for low noise and proper gain structure

Tuner Section

• AM/FM tuner cleaned and checked for stable operation
• Dial tracking verified for accuracy across the frequency range
• Signal strength and tuning response tested for consistent performance

Final Testing & Quality Assurance

• Unit underwent 2–3 hours of continuous operation testing
• Verified stable thermal behavior, channel balance, and noise floor
• All inputs (Phono, AUX, Tape) tested for clean, distortion-free signal
• Final listening tests performed to confirm musical balance and smooth presentation

Result:
The KLH Fifty-One now delivers the warm, balanced, and natural sound that defines classic KLH engineering. With stable electronics, quiet operation, and a clean vintage presentation, this receiver is ready to provide years of reliable listening enjoyment while retaining its original character and understated elegance.

Despite being professionally maintained and restored by our team, some signs of age are still visible, but this does not detract from the aesthetics or functionality of the items.

SUGGESTED PAIRINGS

• Speakers: KLH Model Five, KLH Model Six, Advent Large, Acoustic Research AR-3a
• Turntables: Thorens TD-160, Dual 1219, AR XA
• Tape Decks: TEAC A-2300, Akai GX-4000, Marantz 5020
• Music Styles: Jazz, folk, classic rock, acoustic, vocal-focused recordings

🎁 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.