F2J vs F2
The F2 matches the F2J on power @ 8ω (5W), thd (4.000%), output voltage (9.0V RMS), and output impedance (15Ω).
AI-generated product photo — not official manufacturer imagery.
AmplifiersPower AmplifiersDiscontinued
Estimated price (community-sourced)
$2,200
Around — community and catalog average, updates slowly
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.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 5W @ 8Ω
- Amplifier Class
- A
Analog Output
Analog signal output specifications
- THD
- 4.000%
- Output Voltage
- 9.0V RMS
- Output Impedance
- 15Ω
Key Specifications
Power: 5W
Frequency: 3-200000 Hz
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions