Harman Kardon 630 (1973–1975)

A solid-state AM/FM stereo receiver from Harman Kardon's Twin Powered series, built by Roland. Each channel has its own independently regulated power supply.

Overview

The Harman Kardon 630 is an AM/FM stereo solid-state receiver. It was introduced in 1973 and produced through 1975. Roland manufactured it for Harman Kardon, and it belongs to the Twin Powered series, which is known for dual regulated power supplies. It is noted as the rarest model in the HK X30 series. It works as both a receiver and an integrated amplifier. Each channel has its own regulated voltage supply, which supports 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 630 uses a twin power design. Each channel gets an independently regulated voltage, which allows stable RMS output and rapid dynamic response. Roland produced it for Harman Kardon, and the regulated power supply is built for improved performance.

Context

The 630 came out in 1973 as part of Harman Kardon's X30 Twin Powered series. These receivers were designed for high fidelity with dual regulated power supplies. It is considered the rarest model in the series.

Market

The 630 is regarded as the rarest model in the Twin Powered X30 series, which makes it more collectible. Replacement parts, such as the original metal case, have been listed for $19.99. One used unit was documented at 28 lbs, with dimensions matching the base chassis. That indicates the optional wood cabinet adds significant size and mass.