Elekit TU-HP01 Hybrid Tube Headphone Amplifier. Made in Japan. Preassembled.
------ This is a portable headphone amplifier with a hybrid configuration: 2 subminiature tubes for input and OP-amp for output. Enrich your life with smooth and mellow sound anywhere!
Battery-operated vacuum tube Raytheon 6418 low consumption current and almost no heat generation so that there is no problem if the holes on the chassis are sealed.
Minimized microphonic noise.
Microphonic noise, often controversial in tube portable amp, is minimized by setting the vacuum tubes higher than the PCB.
Unlikely to usual vacuum tube amplifier, TU-HP01 starts up only in a few second after the power is turned ON.
Exchangeable op-amp: 2 op-amps, JRC MUSES8820 and BurrBrown OPA2604, are included as a standard. (MUSES8820 is mounted by default.) In addition, users can exchange it with many other commercially-available op-amps to enjoy the difference in sound.
Dual supply for op-amp... No capacitor is required to the headphone output.
Gain switch... Users can select either high or low according to the input level.
Almost no pop-noise upon power ON.
Vacuum tube: Raytheon 6418 x 2pcs.
Frequency response: 10Hz - 65kHz.
Headphone impedance: 16ohm - 32ohm recommended.
Input terminal: 3.5mm stereo mini jack.
Output terminal: 3.5mm stereo mini jack.
Power supply: AAA dry cell battery x 4pcs, or AAA Ni-MH rechargeable battery x 4pcs. (Battery life: Approx.10 hours).
Dimensions: W78 x H16 x D117 mm (excl. projections).