The world’s best turntables use Soundsmith because we’ve been designing and hand-building the world’s best phono-cartridges for more than thirty years.
Fixed Coil
HE-150/150M MOSFET Power Amplifier

Designed over a lifetime and Hand-Made by Peter LedermannThe 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 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)
PATENTS PENDING
10 year warranty
Specifications
Power requirements: 115 V+/- 10%, 50 – 60 Hz, or 230V +/- 10%, 50-60 Hz
Power consumption: 50 – 770 W
Dimensions: Width: 15.75” Depth: 17” Height: 4” Weight: 46 lbs
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
width | height | depth | weight | |||||||
Product Name | inches | cm. | inches | cm. | inches | cm. | lbs. | kg. | ||
HS-150/150M | 15.750 | 40.005 | 4.125 | 10.478 | 16.500 | 41.910 | 37.00 | 16.78 | ||
IN SHIPPING BOX | 33.500 | 85.090 | 9.500 | 24.130 | 20.250 | 51.435 | 47.00 | 21.32 |
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Cartridge mounting screw set! Only two hands needed to install your cartridge! Adds headshell weight (if desired) to improve sonics – PATENTS PENDING
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They Said What?
“The Soundsmith Carmen’s ultra-low-mass MI assembly plays with more agility, is more naturally detailed, and sounds less stressed than any MC I’m aware of. Its treble is not dull or rolled off—it’s just the most authentic treble I’ve experienced from a phonographic transducer.”
– Herb Recihert, Stereophile
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Contact Info
Soundsmith HQ
8 John Walsh Blvd
Suite 417
Peekskill, NY 10566
USA
Click here to use our website contact form
Technical and General Inquiries:
Peter Green, Logistics, Sales and Technical Support
petergreen@Sound-smith.com
Phone 914 382 3584
For other inquiries: Phone: (914) 739-2885
For Distributor and Dealer Inquiries ONLY:
Mr. John Toney – Dir. of International Sales and Marketing
John@sound-smith.com
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