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- True Class A Tube Warmth: Enjoy the rich, smooth tone of a single-ended Class A vacuum tube amp. F2 brings lifelike detail and natural dynamics to your home setup, perfect for relaxed, immersive listening with matched speakers.
- Tube Rolling Friendly Design: All tubes are pluggable, letting you fine-tune the sound. Default with 5U4G, 6SN7GT and 6CA7 tubes. Enjoy the freedom to personalize tone and texture based on your gear and musical taste.
- Built with Audiophile-Grade Parts: From a robust 160W transformer with Japan Z11 steel core to ALPS precision potentiometer and gold-plated terminals, F2 uses premium parts to reduce noise and elevate musical detail, bringing out the best in every track.
- Easy System Integration: Dual RCA inputs and front selector let you connect a DAC, network streamer, CD player or other audio sources and switch instantly, avoiding constant cable swaps and making F2 the heart of a flexible home stereo setup.
- Precision Drive for HiFi Sound: About 9W ×2 @8Ω Class A power can drive a wide range of bookshelf and floor-standing speakers, especially passive speakers rated around 10-100W with sensitivity≥88dB. Whether used in a desktop setup or living room, it delivers immersive musicality.
- Brand: Nobsound
- Model: F2
- Audio input: 2 sets of RCA inputs
- Audio output: Banana speaker jacks
- Output power: 9W ×2 RMS @ 8Ω (ultralinear operation)
- Frequency response: 20Hz-20KHz
- THD: < 1% (at 1kHz)
- SNR: 88dB
- Input sensitivity: 500mV-2000mV
- Input impedance: 100KΩ
- Compatible speaker impedance: 4Ω-8Ω
- Input voltage: AC 110V-120V / 220V-240V
- Dimensions (W*D*H): 310*225*200mm / 12.20*8.85*7.87in
- Net weight: 8.60kg / 18.96lb
- Package weight: 10.50kg / 23.15lb
- F2 ×1
- Power Cable ×1
Q: What tubes can be replaced on the F2?
A: The F2 supports tube rolling within compatible tube types.
• Rectifier tube: 5U4G (default), compatible with 274B / 5Z3P / 5Z3PA
• Preamp tube: 6SN7GT (default), compatible with 6SN7 / CV181 / 6H8C / 6N8P
• Power tube: 6CA7 (default), compatible with EL34
Please use compatible tube models and follow proper replacement procedures to ensure safe and stable operation.
Q: Can I use 6-ohm speakers with the F2? Which speaker terminals should I use?
A: Yes. 6-ohm speakers are supported. You may connect them to either the 4Ω or 8Ω speaker terminals. In most setups, we recommend using the 8Ω terminals for better dynamics and output strength, while the 4Ω terminals may provide a slightly softer and smoother sound.