J2 Power Amplifier


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The J2 is a stereo Power amplifier rated at 25 watts per channel. It has a two-stage circuit th… More details

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The J2 is a stereo power amplifier rated at 25 watts per channel. It has a two-stage circuit that operates in pure single-ended Class A mode, with signal JFET devices forming the input stage and power JFET devices for the output stage.

JFET transistors have long been recognized as having the highest audio quality of any transistor; the input devices of the J2 are known through the industry as the standard for low noise and linearity, and are found on the inputs of the finest phono stages, line level preamplifiers, and power amplifiers. But for over 30 years robust power JFETs have not been widely available since the short-lived efforts of Sony and Yamaha. In the last few months, advances in Silicon Carbide (SiC) technology have resulted in new power JFET transistors with high voltage, current, and power capabilities – as high as 1200 volts, 30 amps, and 273 watts.

Created by SemiSouth Corporation of Mississippi, these robust new JFETs are designed for very fast high power switching in solar power and electric car applications. However, they also have a very low distortion characteristic that makes them superb for use in linear amplifiers. In apples-to-apples comparisons with comparable MOSFET type power transistors, they can achieve 10 to 20 dB improvements in distortion performance.

For over 10 years First Watt has been pushing the design envelope with simple high performance Class A amplifier circuits, and when a better transistor like this comes along, it can mean getting the same distortion performance with a lot less feedback, or lower distortion with the same amount of feedback. The J2 does amplifier does both,and that helps make it a better sounding amplifier than the best of its predecessors.

J2 Simplified

The J2 power amplifier is simple, clean, and measures astonishingly well. It achieves a sound which is warm and relaxed, combining precision and detail without sterility. With a pair of sensibly efficient loudspeakers, it will give you a toe-tapping experience that other solid state amplifiers do not. The design is extremely reliable and will never need adjustment.

Press and Reviews

Six Moons Review

by Srajan Ebaen
Oct. 2009

Ultra Audio Review
Ultra Audio

by Vade Forrester
Nov. 2012

Part-time Audiophile Review
Part-Time Audiophile

by Scot Hull
Oct. 2012

Stereophile Review

by Herb Reichert
Sep. 2016

Technical Features

@ 1 watt .025%
Input Impedance
100 Kohm
Balanced input CMRR
-60 dB @ 1 Khz
20 dB
Input Sensitivity
280 mV = 1 watt, 1.4 V = rated power
Damping Factor
Output power 8 ohms
30 watts @ 1% THD, 1KHz
Output power 4 ohms
15 watts @ 1% THD, 1 KHz
Frequency response
- 1 dB @ 4 Hz, 100 KHz
100 uV unweighted, 20-20 KHz
Power consumption
200 watts
3AG slow blow type - 2.5 Amp for 120VAC 1.25 Amp for 240 VAC
Parts and labor for 3 years, not covering shipping costs or consequential damages



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