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 branded as part of the company's Twin Powered line, known for its dedicated circuitry and clean audio performance. Manufactured between 1975 and 1978, the 730 was positioned mid-range within the lineup, sitting between the 630 and the flagship 930. It features AM/FM radio tuning and was designed with a layout nearly identical to the 430 and 630 models, reflecting Harman Kardon's modular approach during this era. The unit was marketed as an accessible yet high-quality centerpiece for stereo systems, offering 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 Harman Kardon 430 and 630, reflecting a common chassis and front-panel layout across the Twin Powered series. As a Twin Powered receiver, it follows Harman Kardon’s philosophy of isolating critical audio sections for improved performance, though specific circuit details are not documented in available sources.
Context
The Harman Kardon 730 was positioned mid-range in the Twin Powered series, bridging the gap between the 630 and the flagship 930. This placement made it a popular choice for listeners seeking high-fidelity sound without the premium price of top-tier models.
Market
One recent eBay listing offered a Harman Kardon 730 Twin Stereo Receiver for $999.99, indicating continued collector interest. At least one user has reported needing replacement semiconductors in the preamp section, suggesting potential service needs after decades of storage or use.
eBay Listings
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