The 805 Tube: Power Triode Legacy and Modern Revival
There’s a special kind of excitement that comes with unboxing a new Line Magnetic LM-805IA amplifier. Paired with the Cen.Grand GLD1.0 Media Player, DSDAC1.0 DAC, Atalante 3, and Harbeth P3ESR speakers, even in these early days before burn-in (which typically takes 50–100 hours), the initial sonic results are impressive, showcasing the legendary qualities of the 805 tube.
The 805 vacuum tube stands tall as a directly heated power triode, celebrated for its impactful legacy in both radio broadcasting and audiophile circles. Originally engineered for high-power transmission and modulation, the 805 quickly became a mainstay during radio’s golden age, adopted by influential brands like RCA and United Electronics. Its reliable operation, robust construction, and unique graphite anode allowed it to thrive in some of the most demanding technical environments.
In audio, the 805 reveals its technological brilliance in single-ended and Class A amplifier circuits. It delivers sound with exceptional dynamic range, transparency, and realism. The tube’s signature traits - a swift response to transients, articulate bass, and fluid, natural midrange - are further enriched by its thoriated tungsten filament, which imparts a signature warmth and authenticity. Many enthusiasts praise this tube for the way it breathes life and energy into recordings, illuminating the emotional colours of music.
The past two decades, Line Magnetic has taken a leading role in the 805’s modern revival. With models like the LM-805IA, the company has artfully blended classic SET amplifier philosophy with innovative engineering. Their designs leverage high-quality transformers, meticulous circuit layout, and hand-wired workmanship to deliver powerful, single-ended performance that remains both accessible and reliable.
The result is a warmly dynamic, emotionally engaging sound signature - admired by critics and cherished by listeners, which marks a new chapter for the remarkable 805 tube and its enduring legacy in high-fidelity audio.
Line Magnetic LM-805IA
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LM-805IA in the Angelic Sound Studio
