F2 vs F1J
The F1J's power @ 8ω is 10W against the F2's 5W, its power @ 4ω 6W against 10W, its thd 5.000% against 4.000%, and its output impedance 80Ω against 15Ω.
AI-generated product photo — not official manufacturer imagery.
AmplifiersPower AmplifiersHeadphone AmplifiersDiscontinued
Estimated price (community-sourced)
$2,150
Around — community and catalog average, updates slowly
About the F2
The First Watt F2, introduced in 2005 and hand-built by Nelson Pass (only about 100 units produced), is a single-stage single-ended Class A current source amplifier without feedback. It features a rich pure 2nd harmonic character, wide bandwidth, and is optimized for high-efficiency full-range drivers like Lowther or Fostex, or as a headphone amp for certain models. Unlike the F1, it has an output impedance of 15 ohms (switchable to ~700 ohms), RCA inputs only, and lower power. The F2J variant uses JFETs for lower distortion. No longer in production; available only used. Recent used market prices range from $1,500 to $2,250 USD.
Specifications
Power Specifications
Amplification power output and characteristics
- Power @ 8Ω
- 5W @ 8Ω
- Power @ 4Ω
- 10W @ 4Ω
- Amplifier Class
- A
Analog Output
Analog signal output specifications
- THD
- 4.000%
- Output Voltage
- 9.0V RMS
- Output Impedance
- 15Ω
Connectivity
Input and output connections
- Analog Inputs
- RCA
Key Specifications
Power: 5W
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions