{ "item_title" : "Audio Amplifiers with Tube Preamp", "item_author" : [" Klaus Röbenack "], "item_description" : "Amplifiers equipped entirely with tubes require a great deal of circuitry and mechanical effort. A conceptually and technically interesting compromise is the combination of a tube preamplifier with a transistorized or integrated power amplifier. This approach, which has also been implemented in quite a few commercial devices, is the focus of this book. The described tube preamplifiers can of course easily be combined with other amplifiers.", "item_img_path" : "https://covers1.booksamillion.com/covers/bam/9/79/871/142/9798711423324_b.jpg", "price_data" : { "retail_price" : "22.59", "online_price" : "22.59", "our_price" : "22.59", "club_price" : "22.59", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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