Douk Audio F3 HiFi Tube Amplifier Class A Single-Ended Stereo Audio Amp

Features Single-ended Class A Tube Amp: The F3 uses a single-ended Class A tube circuit for smooth, continuous amplification, helping vocals sound softer, instruments more textured, and music more relaxed. Connect RCA line sources such as DACs, CD players, or streamers for a warm HiFi listening experience. Classic Analog Tube Sound: GE 6DK6 driver tubes help shape clear mids and vocal presence, while Valvo PL84 output tubes add warmth, rich harmonics, and natural tube character. Together, they create an analog tube sound that balances clarity, texture, and long-session listening comfort. Refined 3.2W × 2 Class A Output: With 3.2W × 2 of pure Class A power, the F3 is tuned for high-sensitivity passive bookshelf speakers. Its smooth output character gives vocals more body, preserves natural dynamics, and keeps music relaxed, coherent, and easy to enjoy. Real-Time Music Spectrum Display: Watch your music come to life on the front spectrum display. Vibrant visual feedback matches the glowing tubes, giving you an immersive, analog-inspired experience that engages sight and hearing together, turning every track into a small performance. Handcrafted Wood Cabinet: Each F3 features a handcrafted wood cabinet with natural grain, making every unit unique. Compact and elegant, it blends seamlessly into your desktop or HiFi setup, adding tactile warmth and a refined, vintage feel to your listening environment. Q: Why does my F3's wooden finish look slightly different from the pictures? A: The F3 features a real wood cabinet, handcrafted for each unit. Natural grain and color variations may occur, and minor cosmetic imperfections are normal, making each amplifier unique. Q: Can I power on the F3 without speakers connected? A: No. Always connect speakers before powering on. Operating without a load may damage the output transformer. Q: Can I leave the volume knob at my usual listening position when turning the F3 on or off? A: No. Always set the volume knob to minimum before power on and power off to protect the tubes and internal circuitry. Q: Why does the F3 sound tight or thin right after turning on? A: This is normal. Tubes require 30–60 minutes to reach proper operating temperature, after which sound becomes smoother and more natural. Q: Some tube sockets appear to have missing pin contacts. Is this a defect? A: No. Some ceramic tube sockets are designed without contacts for unused tube pins. It does not affect performance. Q: Can I upgrade or replace tubes with other models? A: No. Using other types may damage the F3. The model of the supplied tubes may vary depending on the production batch, which is normal. Please refer to the actual product received. Parameters Brand: Douk Audio Model: F3 Audio Input: Stereo RCA Audio Output: Banana Speaker Jacks Vacuum Tubes: PL84 × 2, 6DK6 × 2 Output Power: 3.2W × 2 Output Impedance: 4Ω / 8Ω SNR: ≥ 85 dB THD (at rated power): ≤ 7% Frequency Response: 30Hz – 20kHz (±3dB) Input Sensitivity: 500mV – 2V Rated Power Consumption: 42W Input Voltage: AC 100–240V, 50/60Hz Dimensions (W × D × H): 180 × 144 × 115 mm / 7.09 × 5.67 × 4.53 in Net Weight: 2.5 kg / 5.51 lb Package Weight: 2.9 kg / 6.39 lb Packing List 1 × F3 2 × 6DK6 Tubes 2 × PL84 Tubes 1 × Power Cable