Harman Kardon 730 (1975–1978)

A mid-range solid-state stereo receiver from Harman Kardon's Twin Powered series, produced during the mid-to-late 1970s.

Overview

The Harman Kardon 730 is a solid-state stereo receiver in the company's Twin Powered line, which was known for dedicated circuitry and clean audio. It was made between 1975 and 1978. It sat mid-range in the lineup, between the 630 and the flagship 930. It has AM/FM tuning, and its layout is nearly identical to the 430 and 630, which fits Harman Kardon's modular approach in those years. Harman Kardon sold it as an accessible, high-quality centerpiece for a stereo system, with strong performance at a reasonable cost.

Specifications

Tuning range	FM, MW
Power output	40 watts per channel into 8Ω (stereo)
Frequency response	4Hz to 130kHz
Input sensitivity	2.5mV (MM), 150mV (line)
Signal to noise ratio	72dB (MM), 77dB (line)
Dimensions	432 x 368 x 140 mm
Weight	13.7 kg
Original MSRP	$400

Design

The 730 shares a nearly identical design with the 430 and 630, with a common chassis and front-panel layout across the Twin Powered series. As a Twin Powered receiver, it follows Harman Kardon's approach of isolating critical audio sections for better performance. Specific circuit details are not documented in available sources.

Context

The 730 sat mid-range in the Twin Powered series, between the 630 and the flagship 930. That made it a popular pick for listeners who wanted high-fidelity sound without paying for a top-tier model.

Market

One recent eBay listing offered a Harman Kardon 730 Twin Stereo Receiver for $999.99, so collectors are still interested. At least one user has reported needing replacement semiconductors in the preamp section, which may point to service needs after decades of storage or use.