{"product_id":"audio-research-gspre-tube-preamplfifier-w-brand-new-remote-control","title":"Audio Research GSPre Tube Preamplifier - W\/ Brand New Remote Control","description":"\u003cp\u003e\u003cb\u003eGeneral:\u003c\/b\u003e\u003cbr\u003eThe GSPre is a beautiful, full-function tube preamplifier from Audio Research part of their prestigious Galileo (G) series. Features include a sophisticated phono stage with a variety of loading options, a total of six 6H30P dual-triode vacuum tubes (two for the phono stage and four for the line stage), and a dedicated headphone output. A dedicated headphone output is something missing from a surprising amount of modern preamps, so having one here is great.\u003cbr\u003e\u003cbr\u003eAnother great feature is its complete support for balanced connectivity, making it exceptionally versatile for integrating with high-end source components like dedicated CD players. True fully balanced XLR inputs and outputs across the board are a rare find when many units only offer balanced inputs paired with single-ended RCA outputs.\u003cbr\u003e\u003cbr\u003eFinished with the precision you expect from Audio Research, all front-panel controls feel exceptionally solid and tactile. The industrial design allows it to blend seamlessly into modern or traditional systems, pairing effortlessly with either silver or black components.\u003cbr\u003e\u003cbr\u003ePart of our testing process includes testing the vacuum tubes on our in house Amprex tube tester and they passed with flying colors. It appears the tubes only have 21 hours on them according to the tube counter. \u003cbr\u003e\u003cbr\u003eIn testing we really enjoyed this unit and we felt it sounded great with every bit of music we played on it. In addition, it was very quiet making it a make a great reference tube preamplifier for someone's collection.\u003cbr\u003e\u003cbr\u003eAs a bonus this particular GSPre includes a brand-new remote control which we purchased from Audio research, it still retains its original protective factory plastic.\u003cbr\u003e\u003cbr\u003eIt will be packed with care using custom packing material so it arrives safely at its new home.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSkyFi Cosmetic Notes:\u003c\/b\u003e\u003cbr\u003eVery light scratches on the front screen glass, Overall Excellent.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eSkyFi Technical Notes:\u003c\/b\u003e\u003cbr\u003eThe tubes in this unit tested very strong. The tube counter on the front of the unit reads only 21 hours. We are unsure when the counter was last reset but based on the condition of the tubes we suspect that the tubes were recently changed.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eBrand Background:\u003c\/b\u003e\u003cbr\u003eAudio Research continues its dedication to unparalleled musical expression and crafting components of the highest quality and lasting value for its customers. Our long-term dedication to service is peerless in this industry (Audio Research, with few exceptions, can repair anything ever produced during its entire history). We continue to seek out new and exciting ways to make music more real and more enjoyable. More than just a name or a marketing tool, Audio Research has come to represent exceptional performance and long-term value. Experience Audio Research – experience High Definition®.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eOwnership:\u003c\/b\u003e\u003cbr\u003eSingle Owner\u003cbr\u003e\u003cbr\u003e\u003cb\u003eConnections:\u003c\/b\u003e\u003cbr\u003eRCA, XLR, IEC Power, 12V Trigger, RS232\u003cbr\u003e\u003cbr\u003e\u003cb\u003eGeneral Sound:\u003c\/b\u003e\u003cbr\u003eSmooth, uncolored, undistorted natural and clean\u003cbr\u003e\u003cbr\u003e\u003cb\u003eCosmetic Condition:\u003c\/b\u003e\u003cbr\u003e8\/10 = Very Good. Excellent front faceplate, one minor flaw on chassis side or top. See our detailed rating description \u003ca href=\"https:\/\/skyfiaudio.com\/pages\/our-rating-scale\" target=\"_blank\"\u003ehere\u003c\/a\u003e.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eWorking Condition:\u003c\/b\u003e\u003cbr\u003eWorking perfectly and tested in our lab and listening room.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eIncluded:\u003c\/b\u003e\u003cbr\u003eUnit, remote, manual and power cord.\u003cbr\u003e\u003cbr\u003e\u003cb\u003ePacking:\u003c\/b\u003e\u003cbr\u003eWill be packed using our highly developed in-house process and custom packing materials.\u003ciframe width=\"1280\" height=\"720\" src=\"https:\/\/www.youtube.com\/embed\/wuWesEecAbE?\u0026amp;autoplay=1\u0026amp;mute=1\" title=\"This Is How We Pack Sensitive Electronics at SkyFi Audio, Less Than 0.2% Shipping Damage\"\u003e\u003c\/iframe\u003e\u003cb\u003eSpecs:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"markdown markdown-main-panel md-content enable-luminous-fast-follows enable-updated-hr-color tutor-markdown-rendering\" style=\"--animation-duration: 400ms; --fade-animation-function: ease-out;\" id=\"model-response-message-contentr_752e5c1e56d63464\" dir=\"ltr\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eTube Complement:\u003c\/b\u003e Six 6H30P dual triodes used across the line stage, phono section, and power supply regulation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eFrequency Response:\u003c\/b\u003e \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.7778em; vertical-align: -0.0833em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e±\u003c\/span\u003e\u003cspan class=\"mord\"\u003e0.3\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (\u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6833em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e2\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e Hz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e to \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e80\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e kHz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e) for line, \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.7778em; vertical-align: -0.0833em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e±\u003c\/span\u003e\u003cspan class=\"mord\"\u003e0.1\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e RIAA for phono, and \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.7778em; vertical-align: -0.0833em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e±\u003c\/span\u003e\u003cspan class=\"mord\"\u003e0.05\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (\u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6833em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e20\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e Hz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e to \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e20\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e kHz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e) for headphone\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eDistortion (THD):\u003c\/b\u003e \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.5782em; vertical-align: -0.0391em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mrel\"\u003e\u0026lt;\u003c\/span\u003e\u003cspan class=\"mspace\" style=\"margin-right: 0.2778em;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.8056em; vertical-align: -0.0556em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e0.002%\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (line), \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.5782em; vertical-align: -0.0391em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mrel\"\u003e\u0026lt;\u003c\/span\u003e\u003cspan class=\"mspace\" style=\"margin-right: 0.2778em;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.8056em; vertical-align: -0.0556em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e0.005%\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (phono), and \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.5782em; vertical-align: -0.0391em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mrel\"\u003e\u0026lt;\u003c\/span\u003e\u003cspan class=\"mspace\" style=\"margin-right: 0.2778em;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.8056em; vertical-align: -0.0556em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e0.009%\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (headphone)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eGain:\u003c\/b\u003e \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e13.8\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (line), \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e58\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e at \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e1\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e kHz\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (phono), and \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e11.3\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e (headphone)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eImpedance:\u003c\/b\u003e Input is \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e150\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e k\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003eΩ\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e Balanced \/ \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e75\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e k\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003eΩ\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e SE with programmable phono options; output is \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6833em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e500Ω\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e Balanced \/ \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6833em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e250Ω\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e SE\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSignal-to-Noise Ratio:\u003c\/b\u003e \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.5782em; vertical-align: -0.0391em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mrel\"\u003e\u0026gt;\u003c\/span\u003e\u003cspan class=\"mspace\" style=\"margin-right: 0.2778em;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e125\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e for line, \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.5782em; vertical-align: -0.0391em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mrel\"\u003e\u0026gt;\u003c\/span\u003e\u003cspan class=\"mspace\" style=\"margin-right: 0.2778em;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e94\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e for phono, and \u003cspan class=\"math-inline\"\u003e\u003cspan class=\"katex\"\u003e\u003cspan class=\"katex-html\"\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.5782em; vertical-align: -0.0391em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mrel\"\u003e\u0026gt;\u003c\/span\u003e\u003cspan class=\"mspace\" style=\"margin-right: 0.2778em;\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"base\"\u003e\u003cspan class=\"strut\" style=\"height: 0.6944em;\"\u003e\u003c\/span\u003e\u003cspan class=\"mord\"\u003e110\u003c\/span\u003e\u003cspan class=\"mord text\"\u003e\u003cspan class=\"mord\"\u003e dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e for headphones\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions\u003c\/strong\u003e:\u003cbr\u003e9” W x 7.75” H x 17.25” D\u003cbr\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWeight:\u003c\/b\u003e\u003cbr\u003e25 lbs.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eApproximate Age:\u003c\/b\u003e\u003cbr\u003e2014\u003cbr\u003e\u003cbr\u003e\u003cb\u003eLink to Manual:\u003c\/b\u003e\u003cbr\u003e\u003ca href=\"https:\/\/audioresearch.com\/new_website\/wp-content\/uploads\/2024\/11\/GSPre-manual.pdf\" target=\"_blank\"\u003eClick Here\u003c\/a\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eRecommended Cables:\u003c\/b\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-hero-interconnects-pair-rca-ultraplate-or-wbt-connectors-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - RCA Interconnects\u003c\/a\u003e - Better\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-silver-streak-interconnects-pair-rca-ultraplate-or-wbt-connectors\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - RCA Interconnects\u003c\/a\u003e - Best\u003cbr\u003e\u003cbr\u003e\u003ca title=\"Kimber Kable - TAK-CU - New Speciality Series Tonearm Cable, New - SkyFi Audio\" href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-tak-cu-phono-cable-with-wbt-connectors\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - Phono Interconnects\u003c\/a\u003e\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/collections\/our-kimber-kable-collection\/products\/kimber-kable-ascent-series-hero-analog-interconnects-pair-balanced-xlr-connectors-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - BALANCED XLR Connectors\u003c\/a\u003e - Better\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/collections\/our-kimber-kable-collection\/products\/kimber-kable-summit-series-silver-streak-analog-interconnects-pair-balanced-xlr-connectors-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - BALANCED XLR Connectors\u003c\/a\u003e - Best\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-pk14-pk-14-ascent-power-cord-brand-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - Power Cords\u003c\/a\u003e - Better\u003cbr\u003e\u003cbr\u003e\u003ca href=\"https:\/\/skyfiaudio.com\/products\/kimber-kable-ascent-series-pk10-pk-10-power-cord-brand-new\" rel=\"noopener\" target=\"_blank\"\u003eKimber Kable - Power Cords\u003c\/a\u003e - Best\u003cbr\u003e\u003cbr\u003e\u003cb\u003eTesting Process:\u003c\/b\u003e\u003cbr\u003eWe start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR. \u003cbr\u003e\u003cbr\u003eWhen we first power on a preamplifier we connect its RCA output to a Sencore PA81 Power Analyzer which simulates real world loading conditions and gives us an oscilloscope interface.\u003cbr\u003e\u003cbr\u003eThe first order of business is checking that the volume control works smoothly throughout its entire range with acceptable channel balance. This is accomplished by feeding a 1 KHz sine wave into one of the preamp’s line level inputs while monitoring the preamp’s output on an oscilloscope.\u003cbr\u003e\u003cbr\u003eWe then switch to a 1 KHz square wave to test the tone controls, loudness function, and filters where applicable. During this step we are watching for equal alteration of the test signal by both channels. This also helps us identify dirty controls that will need treatment.\u003cbr\u003e\u003cbr\u003eOnce the basic line stage functions are verified, we test each input individually. This is especially important for devices that use relays to select their sources. If the preamp is equipped with a phono stage we test that as well. We use an inverse RIAA filter which allows us to feed a reference test signal into the phono input with the proper RIAA equalization and level. A square wave or sine sweep is used to verify that the device’s phono stage is faithfully reproducing the RIAA curve. If the preamp under test has balanced inputs and\/or outputs these are tested as well.\u003cbr\u003e\u003cbr\u003eWe finish up our bench testing with a listening test with our bench amplifier and reference speakers. During this test we check for hum or hiss that may not have shown up in earlier testing. We also check that all of the tone controls and filters perform as expected.\u003cbr\u003e\u003cbr\u003eIf the preamplifier has remote control functions these are also tested. Preamps with tube circuits or complicated power supply topologies are connected at our long term test rig for extended stress testing under real world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!----\u003e\n\u003c\/div\u003e","brand":"Audio Research","offers":[{"title":"Default Title","offer_id":48841193750782,"sku":"108021","price":9923.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0003\/3275\/9084\/files\/audio-research-gspre-tube-preamplifier-w-brand-new-remote-control-635.jpg?v=1788209169","url":"https:\/\/skyfiaudio.com\/en-au\/products\/audio-research-gspre-tube-preamplfifier-w-brand-new-remote-control","provider":"SkyFi Audio","version":"1.0","type":"link"}