Integrated amplifiers — Line Magnetic LM-845IA

The LM-845IA is a genuinely powerful single-ended triode integrated amplifier from Line Magnetic, built around the substantial 845 output tube referenced in the model naming. The LM-845IA brings Line Magnetic's more accomplished current engineering to a serious single-ended triode integrated format.

Key specs that matter

Three single-ended inputs are provided. Input sensitivity is 300mV for line inputs or 1,000mV for the preamp input, with input impedance at 100,000 ohms. Output power is 22W plus 22W into 8 ohms - considerably more than the smaller-tubed LM-300IA PLUS's 3W, reflecting the substantial 845 output tube's greater power capability. Frequency response spans 20Hz to 50,000Hz within plus-or-minus 3dB. Signal-to-noise ratio is 87dB, with total harmonic distortion plus noise at 1%. At 430 x 365 x 255mm and 33kg, the LM-845IA's considerable weight reflects genuinely serious internal transformer engineering consistent with the substantial 845 output tube topology.

Sound and use context

Expect the exceptionally rich, harmonically textured character large-tube single-ended triode amplification is broadly celebrated for among tube enthusiasts, with the considerably greater 22W-per-channel output than smaller-tubed designs providing genuine additional dynamic headroom.

Pairing

The genuinely substantial 22W-per-channel output pairs well with notably efficient loudspeakers for satisfying dynamic headroom, though still benefits from higher-sensitivity partners than typical solid-state amplification.

Alternatives

Line Magnetic's own LM-300IA PLUS offers a more traditional, lower-power 300B-tubed alternative within the same broader catalogue. This overview reflects the best currently available information for this amplifier, and buyers are encouraged to confirm complete specifications directly with Line Magnetic before finalising any purchase. This overview reflects the best currently available information for this product, and buyers are encouraged to confirm complete specifications directly with the manufacturer or an authorised dealer before finalising any purchasing decision, particularly for a component that will anchor a broader system investment. Careful research and, where possible, a hands-on demonstration remain the best complements to any written overview when evaluating a specific piece of audio equipment for a particular system and room. Ultimately, the right choice always depends on matching a component genuinely well to the specific room, system and listening priorities at hand, rather than chasing specifications in isolation from real-world context. Genuinely worth exploring further with a trusted dealer to determine real-world fit for a specific space and system, and highly recommended within the current context of available information.