Integrated amplifiers — Line Magnetic LM-300IA PLUS

The LM-300IA PLUS is a genuinely distinctive single-ended triode integrated amplifier from Line Magnetic, built around the celebrated 300B output tube referenced in the model naming. The LM-300IA PLUS brings Line Magnetic's considered engineering to a single-ended triode integrated format.

Key specs that matter

Three single-ended inputs are provided. Input sensitivity is 200mV, with input impedance at 100,000 ohms. Output power is a genuinely modest 3W plus 3W into 8 ohms - a classic single-ended triode figure reflecting the celebrated topology's inherent power limitations. 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 440 x 425 x 230mm and 37.6kg, the LM-300IA PLUS's considerable weight for a modest-power amplifier reflects genuinely serious internal transformer engineering consistent with quality single-ended triode design.

Sound and use context

Expect the exceptionally rich, harmonically textured character single-ended triode 300B-tube amplification is broadly celebrated for among tube enthusiasts, with the genuinely modest 3W-per-channel output demanding notably efficient loudspeaker partners.

Pairing

The genuinely modest 3W-per-channel output pairs best with notably efficient loudspeakers - typically 95dB sensitivity or higher - to achieve satisfying dynamic headroom.

Alternatives

Line Magnetic's own LM-845IA offers a considerably more powerful alternative built around the larger 845 output tube 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.