Specifications:
Tubes: 6K4 × 2
OP-amp: NE5532
Audio Input: 3.5mm Audio jack, Stereo L / R RCA
Audio Output: 6.35mm
Headphones Maxpower output: 600 mW / 62Ω, 900 MW / 32Ω, 1 W / 16Ω
Frequency range: 20Hz-20 kHz (± 3dB)
THD: ≤0, 03%
Matching headphone impedance: 32-600 Ω
NR: ≥ 95db
Operating voltage: DC12V
Input sensitivity: 0.2mV
Dimension: L99 * W98 * H33 mm
Net weight: 0.25 kg
Model direct replacement tube: 6j1, 6AK5, EF95, 5654, 403B etc.
Packing List:
1 * headphone amplifier
2 * 6J4 vacuum tubes
1 * DC 12V Power Supply
1 * 6.35mm to 3.5mm Adapter
Tips:
1. When you use this product for a long time,please do not touch it by your bare hand, it may hot,but please don't worry this is a normal phenomenon.)
2. Please plug the power supply after all the connection been done for safety;
3. We recommend using 32~600Ω headphones, while armature earphones and headphones that have low resistance and high sensitivity are not suitable.
4. For noise issue, please keep it away from devices like routers, mobile phones or something that may interfere in the audio signal.
5. Please make sure the tubes completely pushed into the device, incompletely connection will cause noise or poping sound.