Harman Kardon 630 (1973–1975)

A solid-state AM/FM stereo receiver from Harman Kardon’s Twin Powered series, produced by Roland with independently regulated power supplies per channel.

Overview

The Harman Kardon 630 is an AM/FM stereo solid-state receiver introduced in 1973 and produced through 1975. It was manufactured by Roland for Harman Kardon and is part of the Twin Powered series, a line known for its dual regulated power supplies. The 630 is noted as the rarest model in the HK X30 series. It functions as both a receiver and an integrated amplifier, with each channel featuring its own regulated voltage supply to support full RMS output and instantaneous recovery.

Specifications

Product type	AM/FM Stereo Solid State Receiver
Power output	30 watts RMS per channel, both channels driven
Tuning range	FM, MW
Dimensions	17″ x 13 3/4″ x 4 3/4″
Weight	28 lbs
Original price	$359.95
Optional cabinet	CW95 wood cabinet, $34.95
S/N ratio	-80 dB (phono), -90 dB (line)

Design

The Harman Kardon 630 features a twin power design with independently regulated voltages for each channel, allowing stable RMS output and rapid dynamic response. It was produced by Roland for Harman Kardon and includes a meticulously regulated power supply for improved performance.

Context

Introduced in 1973, the 630 was part of Harman Kardon’s X30 Twin Powered series, a lineup of receivers designed for high fidelity with dual regulated power supplies. It is considered the rarest model in this series.

Market

The Harman Kardon 630 is regarded as the rarest model in the Twin Powered X30 series, contributing to its collectibility. Replacement parts, such as the original metal case, have been listed for $19.99. A used unit was documented with 28 lbs weight and dimensions matching the base chassis, indicating the optional wood cabinet adds significant size and mass.

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