Line Magnetic LM-845IA Tube Integrated Amplifier

The Line Magnetic LM-845IA is a single-ended integrated amplifier in pure Class A with two 845 tubes and 2×22 watts of output power.

Why the LM-845IA?

The 845 is one of the largest common triodes used in tube amplifier building. The LM-845IA is the evolution of the older LM-518 and brings this tube into a modern chassis with point-to-point wiring and a bias display with a genuine ammeter.

What you hear

One review describes the LM-845IA as initially showing "a slight sharpness in the upper midrange" that settled down "after a few hours of operation" (HiFi-Advice, Christiaan Punter, 2018) – after break-in, a balanced, powerful 845 sound.

Who is the LM-845IA for? (and who it isn't)

For listeners willing to give the 845 tube its break-in time and who run efficient to medium-sensitivity speakers. Straight talk: plan the first few days as a break-in phase instead of taking the very first listening impression as a final verdict.

Our verdict

An honest entry into the large 845 tube, with a documented but manageable break-in period.

Technical specifications

• Circuit design: tube integrated amplifier, single-ended, pure Class A
• Output power: 2× 22 W
• Tube complement: 2× 845, 2× 12AX7, 2× 6P3P, 1× 5AR4 (rectifier)
• 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): 365 × 250 × 340 mm
• Weight: 35 kg

Frequently asked questions

Does the LM-845IA need a break-in period?

Yes. According to the specialist press, an initial sharpness in the upper midrange settles down after a few hours of operation – give the unit a few days of regular use.

Does the LM-845IA have a headphone output?

No.

Is the LM-845IA the successor to the LM-518?

Yes, according to the manufacturer it's a quality overhaul of the earlier LM-518 amplifier with the same tube philosophy.

How heavy is the LM-845IA?

35 kg – a sturdy spot to place it is recommended.

Why buy the LM-845IA at HD Zürisee?

We accompany you through the break-in period and advise you on speakers that suit the 845 tube – we're here for you even after the purchase.

Pairs well with

Efficient speakers from our speaker collection get the best out of the 845 tube.