{"product_id":"ray-tubes-core-12au7-copy-1","title":"Ray Tubes CORE 12AU7","description":"\u003ch2\u003eCORE 12AU7\u003c\/h2\u003e\n\u003cp\u003eIntroduced in 1946, the 12AU7 was the world's first noval (nine-pin) vacuum tube. The 12AU7 is a double triode, consisting of two 6C4 tubes in a single envelope. Before the advent of solid-state electronics, it was valued for its versatility and portability. Nowadays, you'll find it in the pre-amp phase of tube amplifiers, where it functions as a phase inverter or driver.\u003c\/p\u003e\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cp\u003eCORE is the Ray Tubes entry tier. Built new for audio, measured, matched, and covered by the Ray Tubes One Year Warranty.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned and manufactured by a team with decades of experience\u003c\/li\u003e\n\u003cli\u003eHand-selected specifically for use in audio applications\u003c\/li\u003e\n\u003cli\u003eSubstantially more consistent performance than New Old Stock\u003c\/li\u003e\n\u003cli\u003eUnlike NOS and most other new production, covered by the Ray Tubes\u003cbr\u003eOne Year Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSounds Characteristics \u003c\/h2\u003e\n\u003cp\u003eThe CORE 12AU7 provides a clear and natural sound, with a midrange built for warmth and smoothness in compact systems.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe bass is mild and balanced, well-suited for light music and medium-small dynamic audio.\u003c\/li\u003e\n\u003cli\u003eThe midrange frequencies are clear, natural, and warm. Female vocals are particularly vibrant.\u003c\/li\u003e\n\u003cli\u003eThe treble performance is detailed and non-fatiguing, good for extended listening sessions.\u003c\/li\u003e\n\u003cli\u003eThe dynamics are well balanced and the soundstage is of medium size with good positioning, making it ideal for compact audio systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAvailable as a single tube ( RT-CO-12AU7-X1 ) or matched pair\u003cbr\u003e( RT-CO-12AU7-X2 )\u003c\/li\u003e\n\u003cli\u003eUser handbook featuring burn-in guidelines\u003c\/li\u003e\n\u003cli\u003eCertificate of authenticity and warranty\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Ray Tubes","offers":[{"title":"Single (1 tube)","offer_id":47539150717012,"sku":null,"price":29.0,"currency_code":"USD","in_stock":true},{"title":"Matched Pair (2 tubes)","offer_id":47539150749780,"sku":null,"price":69.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/7321\/3524\/files\/CORE12AU7-01.jpg?v=1787334174","url":"https:\/\/prospercables.com\/products\/ray-tubes-core-12au7-copy-1","provider":"Prosper Cables ","version":"1.0","type":"link"}