Line Magnetic LM-88IA Tube Integrated Amplifier

The Line Magnetic LM-88IA is a tube integrated amplifier with four KT88 output tubes that plays in either triode or ultralinear mode.

Why the LM-88IA?

Two sound characters in one unit: a switch between triode and ultralinear operation effectively turns the LM-88IA into two amplifiers. A toroidal transformer with a Z11 core for the power supply and the familiar point-to-point wiring live up to the Line Magnetic standard.

What you hear

In triode mode, velvety and intimate; in ultralinear mode, punchier and more controlled – both directly comparable via the switch on your own system, without changing units.

Who is the LM-88IA for? (and who it isn't)

For anyone who wants to switch between two tube sound worlds without buying two amplifiers. Straight talk: if you can never settle on one sound, you'll love the switching – if you want clear-cut conditions from the start, you're often happier with a pure triode or ultralinear unit.

Our verdict

A two-in-one amplifier for listeners who like to compare for themselves.

Technical specifications

• Circuit design: tube integrated amplifier, switchable triode / ultralinear
• Output power: 2× 30 W (triode), 2× 45 W (ultralinear)
• Tube complement: 4× KT88, 2× 6CL8A, 2× 12BH7
• Frequency response: 10 Hz – 50 kHz (-1.5 dB)
• THD: 1% (1 kHz)
• Signal-to-noise ratio: 87 dB (A-weighted)
• Input sensitivity: 180 mV (ultralinear) / 250 mV (triode) / 1000 mV (Pre-In)
• Input impedance: 100 kΩ
• Speaker outputs: 4 Ω / 8 Ω / 16 Ω
• Inputs: 3× RCA (line), 1× Pre-In
• Dimensions (W×H×D): 430 × 220 × 365 mm
• Weight: 19.6 kg

Frequently asked questions

What's the difference between triode and ultralinear?

Triode tends to sound softer and more intimate at somewhat less power, ultralinear delivers more control and power reserves. Both modes can be switched on the unit.

Does the LM-88IA have a headphone output?

No, the LM-MINI 84IA from the same range is the right choice for that.

Should I switch between the modes while the unit is running?

As with most tube circuits of this kind, we recommend making the switch while the unit is turned off – if you're unsure, feel free to ask us.

Do 16-ohm speakers work with the LM-88IA?

Yes, the binding posts offer connections for 4, 8 and 16 ohms.

Why buy the LM-88IA at HD Zürisee?

We'll show you the difference between triode and ultralinear directly on your own speakers, as far as that's possible at our shop, and advise you on the right combination.

Pairs well with

For speakers that suit both modes of operation, it's worth taking a look at our speaker collection.