Ray Tubes CORE 12AU7

CORE 12AU7 Introduced 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. Product Highlights CORE is the Ray Tubes entry tier. Built new for audio, measured, matched, and covered by the Ray Tubes One Year Warranty. Designed and manufactured by a team with decades of experience Hand-selected specifically for use in audio applications Substantially more consistent performance than New Old Stock Unlike NOS and most other new production, covered by the Ray Tubes One Year Warranty Sounds Characteristics  The CORE 12AU7 provides a clear and natural sound, with a midrange built for warmth and smoothness in compact systems. The bass is mild and balanced, well-suited for light music and medium-small dynamic audio. The midrange frequencies are clear, natural, and warm. Female vocals are particularly vibrant. The treble performance is detailed and non-fatiguing, good for extended listening sessions. The dynamics are well balanced and the soundstage is of medium size with good positioning, making it ideal for compact audio systems. Package Contents Available as a single tube ( RT-CO-12AU7-X1 ) or matched pair ( RT-CO-12AU7-X2 ) User handbook featuring burn-in guidelines Certificate of authenticity and warranty