Description
Audio Research SP9 Tube preamplifier Super Clean mint condition, Working perfectly, including phono input MADE IN USA The SP9 Hybrid Stereo Preamplifier represents a further evolution of the innovative electronic design first embodied in the widely acclaimed Audio Research SP11 Stereo Preamplifier. The SP9 is not a stripped-down version of the SP11, but rather represents an adaptation of some of the SP11s patented hybrid technology to a simpler, more economical single-chassis format.Using just two 6DJ8 vacuum tubes (one in the phono section and one in the high-level stage) in intermediary gain stages, the SP9 expresses the musicality and natural rightness vacuum-tube preamplifiers have been noted for, yet it does so with the quickness and dynamic vigor of the best solid-state designs.Because its two vacuum tubes are used so conservatively, the SP9 will undoubtedly prove to be one of the most reliable and lowmaintenance Audio Research preamps ever up to 10,000 hours of service life are possible before replacement of these tubes might be necessary. And, replacement tubes are not required to be select, low-noise (and expensive) types. Audio Research brand vacuum tubes obtained from your authorized dealer will provide the best performance and reliability.Although the SP9 contains an on-board power supply (as opposed to the SP11s isolated supply), it is a highly advanced, tightly regulated design employing a shielded toroidal power transformer to minimize any potential problems of mechanical noise or hum. Location of this transformer in relation to special low-hum input circuitry has been optimized within the SP9 chassis layout to virtually eliminate transformer-related noise. (Note that while outboard power supplies have become a popular design trend among high-end audio manufacturers, simply isolating the power supply from the main chassis has little benefit if the basic design of the supply itself is second-rate. In such cases, outboard isolation may be little more than a cosmetic cure for more serious deficiencies.)While the SP9 is designed to provide superb playback from phono records, its high-level circuits have also been optimized for other popular input sources, including compact discs. In this respect, the SP9 is virtually overloadproof, insuring maximum enjoyment of todays most dynamic program material. And, with two tape monitor loops, the SP9 offers the tapedubbing flexibility so many listeners want but seldom find in an audiophile-grade preamplifier.Of course, all controls and switches used in the SP9 have been carefully specified and selected to insure minimal sonic degradation - as have the other active and passive components used in the construction of the SP9. While the SP9 is more affordable than some other Audio Research preamplifiers, its more modest price was not achieved at the sacrifice of component quality. Careful, elegant design, structural simplicity and efficient manufacturing techniques have all contributed to a standard of physical integrity and musical accuracy never before achieved in this price class.To audition the SP9 Stereo Preamplifier, visit your authorized Audio Research dealer. Black front panel available at additional cost. Call or write for literature on the complete line of Audio Research products. PLESE SEE PHOTOS FOR ALL THE DETAILS.PLESE CHECK MY STORE AND OTHR ITEMS ALL ITEMS ARE TESTED BEFORE LISTING AND BEFORE SHIPPING. All listings can be canceled without any noticedWe use some other sites for selling to local and international customers If item is used, it has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. CHECK MY FEEDBACK AND BUY WITH CONFIDENCE. POLICY:Buyers have 14 days after the delivery to return the item if return is accept in that sale.We ask all buyers to email us before opening a EBAY CLAIM CASEWe ask all the buyers before leaving a negative or neutral, please email us with the problem first and we will do our best to solve it for you.We care about our buyers and we only want to see them happy.WE WANT TO SEE ALL OUR BUYERS SATISFIEDALL INTERNATIONAL BUYER”ShippingShippings are via FedEx, UPS or USPS ground Shipping will start In same or two days depending on your item.Shipping rate is for USA continental ONLY and is rated to all 48 state, please do not ask for the lower shipping rate. Local pick and inspection is free and can be CASH NO TAX when you do pick up.Shipping address must match eBay profile and CAN NOT be changed ALASKA AND HAWAII BUYERS must ask for the shipping rate before purchase.
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