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1973 advertisement for Harman Kardon 75+ amplifier : Free Download, Borrow, and Streaming : Internet Archive
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Vintage Early 00s Harman/kardon AVR 140 A/V Receiver Optical in Subwoofer 85 Watts per Channel no Remote - Etsy
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Vintage amplifiers that could challenge or approach current state of the art amplifiers | Page 30 | Audio Science Review (ASR) Forum
Sold at Auction: Vintage Harman-Kardon Stereo Amplifier Model 330B - comes with manual etc., untested.
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