Soundsmith HE-150/150M MOSFET Power Amplifier

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Soundsmith HE-150/150M MOSFET Power Amplifier

by Soundsmith

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Product Code:
Soundsmith Phono Preamps
HE-150 / 150-M
HE-150/150M MOSFET Power Amplifier - 2 Models/Colors Available

Have a question about this product? Please email our audio advisor or call 1-877-929-8729 with any questions or concerns regarding your equipment purchase.

Designed Over A Lifetime And Hand-Made By Peter Ledermann

10 Year Warranty

The HE-150 amplifier's design is the result of nearly 40 years of research in solid state amplifiers with the goal of building the most transparent and most reliable design possible. Years of investigation into why most solid state amplifiers cause listening fatigue and often cannot be listened to at all power levels has yielded tremendous results - a highly linearized, Zero Feedback lateral MOSFET amplifier ~one that has been called the most fatigue free sounding, tube like circuit ever made. Although it has the warmth associated with tube designs, it also has (unlike tubes) ultra low distortion and is free of the colorations that tube amplifiers cannot avoid. Being solid state, it does not degrade over the years requiring constant expensive feeding of new tubes and other components due to heat damage. It is unique in the industry, and always solicits comments about how it "disappears".....after all, an amplifier should not get in the way or be noticed.... except for its absence in interfering with your listening.


  • 200 watt per channel, Zero feedback MOSFET Amplifier designed by Peter Ledermann
  • 200 w/ch. 8 Ohms; 450 w/bridged 8 Ohms.
  • THD and IM < .018% full bandwidth. Damping >200 full bandwidth
  • Slew rate > 250 Volts/microsecond.
  • Small signal bandwidth 1.5 Mhz.
  • S/N 106dB down
  • Same as HE-150 but with "V" Volume display, remote volume

15.750 x 4.125 x 16.500 inches W x H x D
37 lbs
200 W/Ch. into 8 ohms/265 W/Ch @ 4 ohms
HE-150 features “Vary-Light” Power Level indication
HE-150M Features "V" display power level indication
Clipping indication for each channel
Touch switch for muting
Touch switch for making Vary Light feature steady light
State settings (power/mute) remembered during mains power off to unit
All models feature unbalanced Inputs; Amplifiers are single ended, non-bridged Output designs (Balanced input &/or bridged output designs are available)
Power requirements: 115 V+/- 10%, 50 - 60 Hz, or 230V +/- 10%, 50-60 Hz
Power consumption: 50 - 770 W
Continuous Average Power Output (per/ch): 8 ohms, 20 - 20,000 Hz 200 watts,
THD < 0.021 %, @190 W/channel
Frequency range: +0/- 0.1 dB, 20 - 20,000 Hz
Output Impedance (20 - 20,000 Hz): typical 0.04 ohms
Wideband Damping Factor: typical 200
SMPTE Intermodulation Distortion: typical 0.05 % IHF Intermodulation Distortion:typical 0.05 %
Slew Rate: 250 V/µS
Channel Separation: > 75 dB
Continuous Average Power Output into 4 ohms (per/ch): 225 W
Frequency range @ 1 Watt: +0/- 0.2dB, 0.1 Hz -1.5 MHz Sensitivity (1 W/8 ohms/1 kHz):800 mV
A-weighted Signal-to-Noise ratio: (Ref. 1 W/8 ohms) 99 dB Minimum
Pulse power: 1250 W in 0.5 ohms

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