{"product_id":"ray-tubes-select-5u4-vacuum-tube","title":"Ray Tubes SELECT 5U4 Vacuum Tube","description":"\u003ch1\u003e\u003cstrong\u003eMeet the 5U4\u003c\/strong\u003e\u003c\/h1\u003e\n \u003cp\u003eThe 5U4 is a common full-wave rectifier tube used in power supplies to convert alternating current to direct current. Its twin-diode design uses a shared cathode and two anodes to convert both halves of the AC cycle. Rectifiers like the 5U4 are sometimes overlooked by audiophiles, but like power and signal tubes, they can greatly influence the sound of a tube amplifier.\u003c\/p\u003e\n \u003ch2\u003e\u003cstrong\u003eA New Dimension of Sound\u003c\/strong\u003e\u003c\/h2\u003e\n \u003cp dir=\"ltr\"\u003eThe SELECT Collection not only maintains the exceptional manufacturing quality of the \u003ca href=\"https:\/\/raytubes.audio\/collections\/core\"\u003eCORE Collection \u003c\/a\u003ebut makes a significant leap in sound quality. Engineered for audiophiles who want an immersive auditory experience, this tier far surpasses what “factory vacuum tubes” can offer.\u003c\/p\u003e\n \u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eMake Your Good Amp Great\u003c\/strong\u003e\u003c\/h2\u003e\n \u003cp dir=\"ltr\"\u003e\u003cspan\u003eThe SELECT Collection significantly upgrades the performance of your vacuum tube amplifier, even starter models. These vacuum tubes are engineered to enhance the hidden capabilities of your amp, transforming its output into something far beyond its original sound profile. With each vacuum tube rigorously selected by our audio engineers, the SELECT Collection ensures a profound enhancement in clarity, texture, and detail. Every note resonates with more realism, every harmony carries more emotionality, and every rhythm pulses with tighter low-end precision.\u003c\/span\u003e\u003c\/p\u003e\n \u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eThe SELECT Vacuum Tube Difference\u003c\/strong\u003e\u003c\/h2\u003e\n \u003cp dir=\"ltr\"\u003e\u003cspan\u003eDespite originating from the same batches as Ray Tubes' CORE Collection, SELECT vacuum tubes are distinguished not by automated manufacturing differences but by the expert judgment of a professional. Their engineers assess each vacuum tube individually for its sound profile, dynamics, microphonics, gain, conductance, noise, and overall performance. This human touch ensures that only vacuum tubes that meet a superior level of sonic excellence are chosen. This meticulous, engineer-led selection is what makes the SELECT Collection exceptionally reliable and capable of delivering next-level sound quality.\u003c\/span\u003e\u003c\/p\u003e\n \u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eSilk-Screen Printed Logos\u003c\/strong\u003e\u003c\/h2\u003e\n \u003cp dir=\"ltr\"\u003eEven the logos deserve a special mention. Silk-screen-printed onto the tubes, they demonstrate Ray Tubes’ commitment to superior craftsmanship down to the smallest detail. This time-honored printing technique yields results that are not only aesthetically pleasing but also durable, ensuring the design work remains vibrant and intact over time.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n \u003ch2 dir=\"ltr\"\u003e\u003cstrong\u003eSuperior Sound, Secured\u003c\/strong\u003e\u003c\/h2\u003e\n \u003cp dir=\"ltr\"\u003eAn exceptional 12-month warranty—a rarity in the world of vacuum tubes, especially NOS vacuum tubes—reflects Ray Tubes’ confidence in their vacuum tubes’ performance and durability. This warranty is your safeguard against any manufacturing defects, making sure that your investment is protected.\u003c\/p\u003e\n \u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003eProduct highlights\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eHand-selected and tested\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eA substantial upgrade from standard NOS tubes\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eLow noise and microphonics\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eFewer than 5% of the tubes commissioned for production meet our voltage, current, and sound signature standards\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003e12-month warranty against manufacturing defects\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eTube type: 5U4\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eSocket: 4-pin\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003eCompatible Amps\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cp dir=\"ltr\"\u003e\u003ca href=\"https:\/\/raytubes.audio\/pages\/tube-compatibility-list\"\u003e\u003cspan\u003eExplore Ray Tubes' Tube Amp Compatibility List\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n \u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003eWhat's included\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eSingle Ray Tubes SELECT 5U4 OR Matched Pair of Ray Tubes SELECT 5U4 OR Matched Quad of Ray Tubes SELECT 5U4\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003cli dir=\"ltr\" aria-level=\"1\"\u003e\n \u003cp dir=\"ltr\" role=\"presentation\"\u003e\u003cspan\u003eManual booklet\u003c\/span\u003e\u003c\/p\u003e\n \u003c\/li\u003e\n \u003c\/ul\u003e\n \u003ch3 dir=\"ltr\"\u003e\u003cstrong\u003eExplore More\u003c\/strong\u003e\u003c\/h3\u003e\n \u003cul\u003e\n \u003cli\u003e\u003ca href=\"https:\/\/apos.audio\/blogs\/audiophile-knowledge-base\/apos-ray-compatible-amps\" rel=\"noopener\" target=\"_blank\"\u003eWhat Tube Amps Are Compatible with Ray Tubes?\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"https:\/\/apos.audio\/blogs\/audiophile-knowledge-base\/howto-maintain-vacuum-tubes\" rel=\"noopener\" target=\"_blank\"\u003eHow Do You Maintain Your Vacuum Tubes?\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"https:\/\/apos.audio\/blogs\/audiophile-knowledge-base\/tube-rolling-guide\" rel=\"noopener\" target=\"_blank\"\u003eHow Do I Roll the Tubes of My Tube Amp?\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"https:\/\/apos.audio\/blogs\/audiophile-knowledge-base\/why-upgrade-your-tubes\" rel=\"noopener\" target=\"_blank\"\u003eWhy Upgrade Your Tubes?\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca rel=\"noopener\" href=\"https:\/\/apos.audio\/blogs\/audiophile-knowledge-base\/what-are-matched-tubes\" target=\"_blank\"\u003eWhat Are Matched Tubes?\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"https:\/\/apos.audio\/blogs\/news\/apos-ray-faq\" target=\"_blank\"\u003eFAQ\u003c\/a\u003e\u003c\/li\u003e\n \u003c\/ul\u003e\n \u003c!----\u003e","brand":"Ray Tubes","offers":[{"title":"Single (1 tube)","offer_id":46866217369775,"sku":"APS-1112-1","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6415\/2239\/files\/apos-audio-ray-tubes-vacuum-tube-ray-tubes-select-5u4-vacuum-tube-single-1-tube-1184013524.jpg?v=1777716312","url":"https:\/\/freshized.com\/products\/ray-tubes-select-5u4-vacuum-tube","provider":"Freshized","version":"1.0","type":"link"}