Reviving a Hi-Fi Classic: the Harman/Kardon A-401 Stereophonic Control Amplifier | Nuts & Volts Magazine
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VINTAGE HARMAN KARDON CONTROL AMPLIFIER AMPLIFIER A 401 / HIFI AMPLIFIER | eBay
Harman Kardon HK 3700 Receiver and KEF Q750 Speakers Hi-Fi System | Audio Junction - Newcastle & Hunter