Lm60 mk2
2SK1058/2SJ162 Lateral Mosfets

Direct Drive technology

The Lm60mk2 uses a pair of highly acclaimed Hitachi Lateral Mosfets 2SK1058 & 2SJ162 for the current stage.

These mosfets are reputed to be the only transistors manufactured solely for audio applications. Unlike normal power transistors, the Hitachi Mosfets do not suffer from Secondary Breakdown. Best of all, they are immune to Thermal Runaway.

In musical reproduction, the Lm60 is probably the sweetest sounding amplifier in AmpsLab. Highly recommended for tube aficionados who are migrating to solid state.

The Mk2 now sports a double-sided pcb incorporating a Ground and Power planes on the component side. All through holes are plated for easy soldering.

Check out our power supply PSU20K50V for the Lm60mk2. It sports a total of 20,000uF of filter caps and is rated for 50V. Best of all, the caps are quality Elna low profile types. Ideal for 1U height rack cases.

Rated Power Output
60 watts continuous into 8 Ω
80 watts continuous into 4 Ω

Input Sensitivty 1.0 Vrms
Input Impedance 33 kΩ unbalanced
Rise Time 1.6 microsec
Voltage Gain 27dB

Power Transformer 30-0-30 Vac (150VA)
PCB Dimensions 120mm x 60mm
PCB Material Fibre Glass FR4
Typical THD @ 60 watts into 8 Ω
1kHz 0.008 %
10kHz 0.054 %
20kHz 0.088 %


Please note the Lm60mk2 is a discrete amplifier. As such, it is not recommended for beginners.

The Mk2 is one channel and is supplied Unassembled. Two kits are required for stereo.

To complete the amplifier, the following are needed:

1) a power supply - consisting of a power transformer, filter capacitors and a bridge rectifier
2) a heatsink for the power mosfets
3) a metal case and the necessary connectors


N-channel Hitachi
Mosfet 2SK1058
Thermal controller
not required
Clean 10KHz Square
wave response into 8
A pair of Lm60 prepared for 1U height case


courtesy of
Stephen Mattys
courtesy of
David Cabana
courtesy of
Ian Johnston
courtesy of
Kostas Lentas
courtesy of
Patrik Hertzog
courtesy of
David Shoubridge
courtesy of
Tony Roberts

60 Downes Street | Calais | ME 04619 | USA