HA-02 is a vacuum tube headphone amplifier which equips speaker output for small BGM sound as well. The amplifier tube is Western electronic vintage miniature tube 408A, has 300mW output is enough output for a headphone amplifier. 408A is superior for noise performance as well as resolution at small volume. HA-02 is designed as a single stage amplifier circuit construction with pentode amplification factor. The transformer is similar high performance one for upper grade amplifier. The output is 50ohms for headphone, 8ohms for speaker. The load impedance for headphones range is 8-600ohms(ideal 50ohms), corresponds almost all headphone types. HA-02 equips a CD direct input which accept to connect portable music players like iPod with attached high quality cable.
| Vacuum Tube | WE408A x2 | |
| Maximum Output | 300mW (50Ohms / headphone) 240mW (8Ohms / speaker) | |
| Gain | 9.5dB/50ohms (headphone) 1.5dB/8ohms (speaker) | |
| Frequency Response | 30-21,000Kz(headphone) 45Hz-17,000Hz (speaker) | |
| Residual Noise | 100μV(headphone output) 70μV(speaker output) | |
| Input | LINE x2 | |
| Dimensions | 150(W)325(D)125(H) mm | |
| Weight | 4.2kg | |
| Power | 100V, 120V, 220~240V/50,60Hz | |