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Integrated amplifiers — Line Magnetic Audio LM-805A

Description, images, technical data and specifications

Line Magnetic Audio LM-805A
Image source — © Line Magnetic Audio

The Line Magnetic LM-805A is a tube integrated amplifier named after the 805 transmitting triode. It is a large, heavy chassis aimed at owners of efficient loudspeakers who want a high-voltage triode design in a single box.

Key specs that matter

Rated output is 20 W into 8 ohms. Input sensitivity is 500 mV, the input impedance is listed as 100 kOhm or 600 ohms, with a selectable gain of 40 or 52 dB. The frequency response covers 10 Hz to 45 kHz at -3 dB, S/N reaches 88 dB and THD+N stays at 1 percent.

Engineering and use context

The amplifier measures 485 x 450 x 570 mm and weighs 75 kg, which calls for a sturdy dedicated support and two people for installation.

Pairing

With this modest output, high-sensitivity loudspeakers make the most sense as partners.

Specifications

  • Model name

    LM-805A

  • Type

    Tube Intagrated Amplifier

  • Analog inputs (balanced)

    N/A

  • Analog inputs (single-ended)

    N/A

  • Input sensitivity (mV)

    500

  • Input impedance (balanced) (Ω)

    100 000 / 600

  • Input impedance (single-ended) (Ω)

    100 000 / 600

  • Output impedance (balanced) (Ω)

    N/A

  • Output impedance (single-ended) (Ω)

    N/A

  • D/A conversion

    N/A

  • Phono MM/MC current-sensing input impedance (Ω)

    N/A

  • Output power (8Ω) (W)

    20

  • Output power (4Ω) (W)

    N/A

  • Gain (dBu)

    40 / 52

  • Frequency response low +/- 3dB (Hz)

    10

  • Frequency response high +/- 3dB (Hz)

    45 000

  • Signal to Noise Ratio (dB)

    88

  • Total Harmonic Distortion + Noise (%)

    1

  • Damping factor

    N/A

  • Dimensions (mm)

    485 x 450 x 570

  • Weight (kg)

    75

  • Official link

    https://line-magnetic.eu/collections/all

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