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Harman Kardon 630 Vintage Stereo Receiver – 30 WPC - Image 1
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Harman Kardon 630 Vintage Stereo Receiver – 30 WPC - Image 5
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Harman Kardon 630 Vintage Stereo Receiver – 30 WPC
Harman Kardon 630 Vintage Stereo Receiver – 30 WPC - Image 2
Harman Kardon 630 Vintage Stereo Receiver – 30 WPC - Image 3
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Harman Kardon 630 Vintage Stereo Receiver – 30 WPC - Image 5
Harman Kardon 630 Vintage Stereo Receiver – 30 WPC - Image 6
Harman Kardon HK3700 Stereo Receiver – 85 WPC, Sub Out
Harman Kardon HK3700 Stereo Receiver – 85 WPC, Sub Out $345.00
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Harman Kardon

Harman Kardon 630 Vintage Stereo Receiver – 30 WPC

$1,295.00

Out of stock

Other stereo receivers in stock now
Harman Kardon HK3700 Stereo Receiver – 85 WPC, Sub Out$345.00Harman Kardon HK3300 Stereo Receiver – 20 WPC$245.00Harman Kardon HK3250 Stereo Receiver – 40 WPC, High Current$245.00

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Other stereo receivers we have in stock now

3 in stock · $245.00–$345.00 · all ship

Harman Kardon HK3700 Stereo Receiver – 85 WPC, Sub OutHarman Kardon HK3700 Stereo Receiver – 85 WPC, Sub Out$345.00ShipsHarman Kardon HK3300 Stereo Receiver – 20 WPCHarman Kardon HK3300 Stereo Receiver – 20 WPC$245.00ShipsHarman Kardon HK3250 Stereo Receiver – 40 WPC, High CurrentHarman Kardon HK3250 Stereo Receiver – 40 WPC, High Current$245.00Ships
Radique Audio RA‑Twin II Bluetooth streamer connected to a vintage Luxman amplifier using Gold Series 3.5mm to Dual RCA cable — premium upgrade bundle for richer sound

Give your next receiver Bluetooth.

The RA-Twin II adds Bluetooth streaming to any vintage receiver or amp with a spare input. The Gold Series RX bundle pairs it with our shielded 3.5 mm to RCA cable, a serious step up from the starter cable, for a higher-end system.

RA-Twin II Gold Series RX Bundle, $69.00 →
Description

Gorgeous Vintage Harman Kardon 30 WPC Stereo Receiver in custom Cherry Cabinet

This beautifully preserved Harman Kardon 630 Twin Powered receiver is a rare vintage classic, now elevated by our comprehensive Level Two service and a stunning, handcrafted Ottawa Valley Cherry wrap-around cabinet. In very good condition both sonically and visually, this legendary stereo receiver is renowned for its robust dual-mono construction, producing rich, dynamic sound and unmatched reliability—a true showpiece for collectors and discerning listeners alike.

The HK 630 features Harman Kardon’s celebrated Twin Powered design, providing independent power supplies for each channel. This unique architecture ensures superb channel separation, exceptional detail, and the ability to drive demanding speakers with composure and authority. The receiver’s warm, “tube-like” signature makes it a favorite with vintage audio fans, while the smooth linear tuning dial, gold-anodized aluminum knobs, and minimalist display bring timeless style to any setting.

Essential features include inputs for phono, auxiliary, and tape, as well as pre-out/main-in jumpers for flexible system integration. Thoughtful touches—like the illuminated dial, high-filter switch, muting, contour mode, and robust speaker outputs—make operation intuitive and versatile. The rear heat sink and mesh guard enhance both cooling and visual appeal, while the solid wood cabinet delivers a uniquely Canadian aesthetic that sets this 630 apart from any other.

Specifications:

Power Output: 30 watts per channel into 8Ω (20–20,000 Hz, both channels driven)

Total Harmonic Distortion: <0.5%

Frequency Response: 4Hz–70kHz (aux input, ±0.5 dB)

Signal-to-Noise Ratio: 85dB (line)

IM Distortion: 0.15%

Speaker Impedance Range: 4–16Ω

FM Tuner Sensitivity: 1.9µV (IHF)

Channel Separation: 32dB @ 1kHz

Pre-out/Main-in connectors, twin mono power supplies

Features: Defeatable contour (loudness), muting, high filter, illuminated indicators, robust speaker switching, rear panel Dolby processor connectors

Dimensions: 18.75 x 14 x 7 inches (475 x 370 x 180 mm; (Including Cherry Wood Cabinet)
Weight: 35.2 lbs (16 kg)

This expertly serviced Harman Kardon 630, uniquely dressed in premium Ottawa Valley Cherry, blends vintage American engineering with Japanese manufacturing and artisan Canadian craftsmanship—ready for pride of place in your listening room or collection.

Asking $1295; buy with confidence and benefit from Radique’s “Bumper to Bumper” warranty and Perpetual trade back policy.

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Additional information
Weight40 lbs
Dimensions18 × 22.75 × 11 in
About brand
Harman Kardon at Radique
We service Harman Kardon, too. Bring us your own Harman Kardon receivers, amplifiers, cassette decks and CD players for repair, servicing or restoration (solid-state gear; we don't take in tube equipment), with a 90-day warranty on the work. See our Audio Service page

Harman Kardon began in New York in 1953, founded by Sidney Harman, who was born in Montreal, and Bernard Kardon. Harman Kardon calls its 1954 Festival D1000 the first hi-fi receiver. We carry Harman Kardon stereo receivers, AV receivers, integrated amplifiers, cassette decks and CD players. We've had more than 130 Harman Kardon listings so far. Every used Harman Kardon here is inspected, tested and serviced as required, then photographed in-house and covered by our Bumper-to-Bumper Warranty and Perpetual Trade-Back Program. Every AV receiver we list is tested input by input on our bench: each HDMI input and output, the analog, optical and coaxial inputs, the subwoofer outputs and the wireless features where it has them. Don't see the model you want? Tell us on First Dibs and we'll email you when one arrives.

The Harman Kardon story, 1953 to today

Sidney Harman and Bernard Kardon left the David Bogen Company, where Kardon was chief engineer, and founded Harman Kardon in New York in 1953. Harman was born in Montreal in 1918 and grew up in New York. Kardon retired in the 1950s.

Receivers first. Harman Kardon calls the Festival D1000 of 1954 the first hi-fi receiver and the Festival TA230 of 1958 the first stereo receiver. The Citation II tube power amplifier of 1959, designed by Stu Hegeman, sold as a kit or ready-built.

Cassette and the 1970s. Harman Kardon says its CAD-5 of 1970 was the first hi-fi cassette recorder with Dolby noise reduction. Its "Twin Powered" receivers of the 1970s, such as the 430 and 730, gave each channel its own power supply.

Owners. Sidney Harman sold the company to Beatrice Foods in the late 1970s, when he became US Deputy Secretary of Commerce. He formed Harman International in 1980 and bought Harman Kardon back in 1985. Samsung bought HARMAN in 2017, and Harman Kardon remains one of its brands.

Which Harman Kardon is which?

Tube era (1950s and 1960s): Festival receivers, and Citation kits and factory-built units such as the Citation I preamplifier and II amplifier.

1970s receivers: the 330 series, the Twin Powered 630, 930, 430 and 730, and the HK670.

1980s receivers: the "i" models such as the hk690i, advertised for its high current capability, and the 330i.

Citation separates: solid-state Citation amplifiers and preamplifiers from 1970 to the 1990s, including the Citation XX of the early 1980s.

Cassette decks: from the CAD-4 and CAD-5 to the 1980s decks numbered CD91 to CD491. Those "CD" models are cassette decks, not CD players; Harman Kardon CD players carry "HD" names.

AV receivers (late 1990s on) and later stereo: the AVR line, such as the AVR 3600, and stereo models such as the HK 3700 and HK 990.

Buying used Harman Kardon: what to check

Dial and meter lamps. Owners report dead or flickering lamps on 1970s receivers such as the 930, 430 and 330C; many are replaced with LEDs.

Capacitors. Expect a 1970s receiver that hasn't been recapped to need it.

Output stage. Owners report blown output transistors on the 730 and 430, often caused by a failed part nearby. Both channels should play cleanly at a realistic level.

Switches. Owners say the 1980s "i" receivers are prone to dirty switches that make channels cut out. Try every input and the balance control.

AV receivers. HDMI is usually the first thing to fail on a modern AV receiver. We test every HDMI input and output before listing.

Everything we list is inspected, tested and serviced as required here, and comes with our warranty.

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