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About the F2J
The First Watt F2J is a stereo power amplifier that updates the original F2 by replacing the gain MOSFET transistor with a new Silicon Carbide (SiC) power JFET device from SemiSouth, resulting in about one-third the distortion of the original F2. It operates as a single-ended Class A current source amplifier delivering 5 watts output with a pure 2nd harmonic character and wide bandwidth (-0.5 dB at 200 kHz). The F2J has a lower input impedance (~25 kOhm) compared to the F2, making it suitable for preamps with ordinary to low output resistance. It retains the same gain, power, and frequency response as the F2 but offers dramatically improved sound quality with lower distortion and noise. The amplifier requires about 15 minutes warm-up for optimal sound and is designed for use with sensitive full-range loudspeaker drivers. The F2J is no longer factory-updated and is considered a specialty product with a 3-year parts and labor warranty originally. It is highly regarded for its musicality and low distortion in a simple Class A design.
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