Line Magnetic LM-150IA Tube Integrated Amplifier

The Line Magnetic LM-150IA is a tube integrated amplifier with four KT150 output tubes and a hearty 2×100 watts of output power.

Why the LM-150IA?

The KT150 is one of the most powerful tubes in the KT family – Line Magnetic uses this for an amplifier that confidently drives even more demanding speakers, without giving up the handcraft of point-to-point wiring, ALPS potentiometers and Realcap capacitors.

What you hear

100 watts of tube power per channel – enough control for most floorstanding speakers, combined with the familiar warm Line Magnetic timbre and remote-controllable volume.

Who is the LM-150IA for? (and who it isn't)

For anyone who wants tube sound but doesn't want to sacrifice control at low frequencies. Straight talk: at 32.5 kg it's no lightweight – a sturdy rack with sufficient load capacity is a must.

Our verdict

The powerhouse of the range for anyone who finds the 38 to 45 watts of the smaller models not enough.

Technical specifications

• Circuit design: tube integrated amplifier, push-pull
• Output power: 2× 100 W
• Tube complement: 4× KT150, 2× 12AX7, 1× 12AU7 (rectifier), 2× 6SN7
• Frequency response: 10 Hz – 50 kHz (-1.5 dB)
• THD: 1% (1 kHz)
• Signal-to-noise ratio: 87 dB (A-weighted)
• Input sensitivity: 220 mV
• Input impedance: 100 kΩ
• Speaker outputs: 4 Ω / 8 Ω / 16 Ω
• Inputs: 3× RCA (line), 1× Pre-In
• Dimensions (W×H×D): 430 × 217 × 355 mm
• Weight: 32.5 kg

Frequently asked questions

How heavy is the LM-150IA and does it need a special rack?

It weighs 32.5 kg – a sturdy hi-fi rack with suitable load capacity is recommended.

Does the LM-150IA have a headphone output?

No, it's designed as a pure speaker amplifier.

How many sources can I connect?

Three line inputs plus one Pre-In input, so four sources in total.

Does it come with a remote control?

Yes, an infrared remote control for volume is included.

Why buy the LM-150IA at HD Zürisee?

We advise you on the right speaker combination and, on request, take care of delivery and setup – not a bad idea at all with a unit this heavy.

Pairs well with

For speakers that benefit from 100 watts of tube power, take a look at our speaker collection.